{ "evaluation_id": "EVAL-20260402-123136", "question_id": "CODE-006", "question_text": "Write comprehensive unit tests for this function. Cover all edge cases, including boundary conditions, error cases, and typical usage.\n\n```python\ndef merge_sorted_streams(*streams, max_items=None):\n \"\"\"\n Merge multiple sorted iterables into a single sorted output.\n \n Args:\n *streams: Variable number of sorted iterables\n max_items: Optional limit on total items to yield\n \n Yields:\n Items from all streams in sorted order\n \n Raises:\n ValueError: If any stream is not sorted\n \"\"\"\n import heapq\n \n heap = []\n iterators = [iter(s) for s in streams]\n \n # Initialize heap with first item from each stream\n for i, it in enumerate(iterators):\n try:\n item = next(it)\n heapq.heappush(heap, (item, i))\n except StopIteration:\n pass\n \n count = 0\n prev = None\n \n while heap and (max_items is None or count < max_items):\n item, stream_idx = heapq.heappop(heap)\n \n # Validate sorting\n if prev is not None and item < prev:\n raise ValueError(f\"Stream {stream_idx} is not sorted\")\n \n yield item\n prev = item\n count += 1\n \n # Get next item from same stream\n try:\n next_item = next(iterators[stream_idx])\n heapq.heappush(heap, (next_item, stream_idx))\n except StopIteration:\n pass\n```\n\nUse pytest. Include parametrized tests where appropriate.", "category": "code", "timestamp": "2026-02-17T00:00:00.000Z", "display_date": "Feb 17, 2026", "winner": { "name": "GPT-5.4", "provider": "openrouter", "score": 9.08 }, "avg_score": 7.195, "matrix_size": 86, "models_used": [ { "id": "claude_opus_46", "name": "Claude Opus 4.6", "provider": "openrouter" }, { "id": "gemini_31_pro", "name": "Gemini 3.1 Pro", "provider": "openrouter" }, { "id": "claude_sonnet_46", "name": "Claude Sonnet 4.6", "provider": "openrouter" }, { "id": "grok_420", "name": "Grok 4.20", "provider": "openrouter" }, { "id": "deepseek_v4", "name": "DeepSeek V4", "provider": "openrouter" }, { "id": "gpt_oss_120b", "name": "GPT-OSS-120B", "provider": "OpenAI" }, { "id": "gemini_3_flash", "name": "Gemini 3 Flash Preview", "provider": "Google" }, { "id": "minimax_m25", "name": "MiniMax M2.5", "provider": "openrouter" }, { "id": "mimo_v2_flash", "name": "MiMo-V2-Flash", "provider": "Xiaomi" }, { "id": "gpt_5_4", "name": "GPT-5.4", "provider": "openrouter" } ], "rankings": { "gpt_5_4": { "display_name": "GPT-5.4", "provider": "openrouter", "average_score": 9.08, "score_count": 9, "min_score": 8.35, "max_score": 10, "rank": 1 }, "deepseek_v4": { "display_name": "DeepSeek V4", "provider": "openrouter", "average_score": 8.37, "score_count": 9, "min_score": 6.6, "max_score": 9.8, "rank": 2 }, "gemini_3_flash": { "display_name": "Gemini 3 Flash Preview", "provider": "Google", "average_score": 8.33, "score_count": 8, "min_score": 7.1, "max_score": 9.4, "rank": 3 }, "grok_420": { "display_name": "Grok 4.20", "provider": "openrouter", "average_score": 7.78, "score_count": 9, "min_score": 5.35, "max_score": 9.6, "rank": 4 }, "mimo_v2_flash": { "display_name": "MiMo-V2-Flash", "provider": "Xiaomi", "average_score": 7.56, "score_count": 9, "min_score": 4.45, "max_score": 9.15, "rank": 5 }, "gpt_oss_120b": { "display_name": "GPT-OSS-120B", "provider": "OpenAI", "average_score": 7.23, "score_count": 9, "min_score": 2.85, "max_score": 9.05, "rank": 6 }, "claude_opus_46": { "display_name": "Claude Opus 4.6", "provider": "openrouter", "average_score": 6.88, "score_count": 8, "min_score": 3.8, "max_score": 8.6, "rank": 7 }, "claude_sonnet_46": { "display_name": "Claude Sonnet 4.6", "provider": "openrouter", "average_score": 6.71, "score_count": 7, "min_score": 2.65, "max_score": 8.6, "rank": 8 }, "minimax_m25": { "display_name": "MiniMax M2.5", "provider": "openrouter", "average_score": 6.61, "score_count": 9, "min_score": 2.65, "max_score": 9.6, "rank": 9 }, "gemini_31_pro": { "display_name": "Gemini 3.1 Pro", "provider": "openrouter", "average_score": 3.4, "score_count": 9, "min_score": 0.65, "max_score": 9, "rank": 10 } }, "judgments": [ { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 3.8, "brief_justification": "Well-structured and covers several basic cases, but the response is incomplete/truncated, redefines the function instead of just tests, lacks requested parametrization, and misses important edge/error cases such as non-comparable items, generators/iterators, lazy behavior, and tie-handling implications." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 0.65, "brief_justification": "The response is truncated and does not provide the requested unit tests. It only starts an introduction and imports, so it is largely incomplete and not useful." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 2.65, "brief_justification": "The response is incomplete and appears truncated mid-test, so it is not runnable as provided. It includes some valid pytest structure and decent coverage of basic/empty cases, but misses many requested edge cases and boundary/error scenarios, and the unfinished parametrized test severely reduces practical usefulness." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 5.35, "brief_justification": "Well-structured and broad in intent, but several tests are incorrect or flawed: negative max_items is not treated as unlimited, list inputs are not exhausted by the function so the iterator exhaustion test is invalid, and the response appears truncated/incomplete. It includes useful coverage ideas and parametrization, but factual/test accuracy issues reduce reliability." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 7.35, "brief_justification": "Clear, mostly accurate pytest coverage with good typical and edge-case tests, but it misses important boundary/error cases such as negative max_items behavior, lazy error triggering, and the implementation-specific bug where unsorted streams may not reliably raise ValueError if global order is preserved. Some claims of comprehensive coverage are therefore overstated." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 2.85, "brief_justification": "The response is incomplete/truncated, so the proposed test file would not run. It includes some reasonable pytest structure and parametrization, but misses many requested edge/error cases and contains incorrect assumptions about the function's unsorted-stream detection semantics." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7.1, "brief_justification": "Well-structured pytest tests covering many normal and edge cases, but it misses important behavioral bugs and boundaries such as cross-stream false ValueError cases, negative max_items behavior, and the fact that the implementation validates global output order rather than per-stream sortedness." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 2.65, "brief_justification": "The response is incomplete/truncated, so it fails to provide a usable comprehensive pytest suite. What is shown is mostly valid and reasonably organized, but it misses many requested edge/error cases and cannot be run as-is." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 4.45, "brief_justification": "The response starts well and includes several relevant pytest cases, but it is truncated mid-test, making the suite unusable as provided. It also misses important edge/error cases such as negative max_items, non-comparable items, and validating lazy behavior more thoroughly." }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 9, "brief_justification": "The test suite is comprehensive, well-structured, and demonstrates deep understanding of the function's actual behavior. It covers all major edge cases: empty streams, single/multiple streams, duplicates, negative numbers, max_items boundaries (None, 0, negative, exact, beyond), generators, laziness verification, unsorted detection, type errors, exception propagation, and input immutability. The parametrized tests are well-organized. The note about the sorting validation subtlety (global output " }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 1.65, "brief_justification": "The response is severely incomplete - it cuts off mid-sentence without providing any actual test cases. There are no test functions, no parametrized tests, no edge case coverage, and no usable code. Only import statements and a comment fragment are provided, making this essentially a non-answer to the question." }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 7.65, "brief_justification": "The response provides well-structured, comprehensive tests covering empty streams, single streams, two-stream merging, many-stream merging, duplicates, negative numbers, and various edge cases. However, the response is truncated mid-test, missing critical test categories: max_items boundary tests, ValueError/unsorted stream error cases, iterator/generator input tests, infinite stream with max_items tests, and parametrized tests for error conditions. The sorting validation error case is a key req" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 7.6, "brief_justification": "The tests are well-structured and cover many important cases including basic functionality, empty streams, max_items, unsorted detection, type variations, and generators. However, there are some issues: (1) The response is truncated - the generator test and potentially more tests are cut off. (2) The test_max_items_negative test assertion is wrong - negative max_items would cause `count < max_items` to be False immediately, yielding empty list, not the full stream. (3) The test_exhausts_all_stre" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8, "brief_justification": "The test suite is well-structured and covers most important cases. However, there are some gaps: the unsorted stream test may not actually trigger the ValueError due to how the sorting validation works (it checks against the global `prev`, not within-stream order, so [1,3,2] with [4,5,6] would raise ValueError when 2 comes after 3 from the merged output - this works but the test description is slightly misleading). Missing tests include: iterator protocol edge cases (custom iterables), max_items" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 6.8, "brief_justification": "The response covers many important test cases including basic merging, max_items boundary conditions, unsorted stream detection, generators, and various edge cases. However, the response is truncated mid-code (cuts off in the Comparable class), which significantly impacts completeness. Missing tests include: no streams at all (zero arguments), max_items=None explicitly, max_items with negative values, single-element streams, very large streams, tuple/mixed-type streams, and the interaction betwe" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7.55, "brief_justification": "Tests are well-structured and cover many important cases. However, there are some issues: (1) The test_unsorted_stream_error_mid_stream test has an incorrect expectation - the sorting validation checks `item < prev` against the global prev, not within a single stream, so the sequence 1,3,4,10,2 would correctly raise ValueError when 2 is popped after 10, but the test's comment reasoning is slightly off about *why*. (2) Missing some edge cases: single-element streams, max_items=None explicitly, ve" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 5.3, "brief_justification": "The response is cut off mid-test, leaving the test suite significantly incomplete. While the structure and organization are good (using classes, fixtures, parametrized tests, clear naming), it only covers typical usage and some boundary conditions before being truncated. Missing entirely are: error/exception tests (unsorted streams, ValueError), max_items parameter tests, generator/iterator behavior tests, duplicate handling across streams, negative numbers, float types, string streams, large in" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.65, "brief_justification": "The test suite covers many important scenarios: standard usage, edge cases (empty streams, generators, single items), max_items boundary conditions with good parametrized tests, error handling for unsorted streams, and duplicate handling. However, the response is truncated mid-test in TestComplexScenarios, missing tests for negative max_items, float inputs, large streams, tuple/custom object streams, and the subtle bug where the sorting validation can produce false positives when items from diff" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 9.6, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 6.4, "brief_justification": "The response provides well-structured and comprehensive test cases covering many edge cases, but the code is cut off at the end, resulting in invalid Python syntax." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 4.75, "brief_justification": "The response provides well-structured tests but cuts off abruptly, causing a syntax error. It also fails to cover the requested error cases (ValueError) and thoroughly test the max_items parameter." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 5.55, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 9.25, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 6, "brief_justification": "The test suite is well-structured and covers many good edge cases using pytest, but the response is truncated at the end, resulting in incomplete code and a syntax error." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.4, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 5.3, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.85, "brief_justification": "The test suite is well-organized and covers a wide range of edge cases using pytest features effectively, but the response is cut off at the end, resulting in a syntax error." }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 9, "brief_justification": "Excellent test suite with comprehensive coverage of edge cases, boundary conditions, and error scenarios. The parametrized tests are well-structured, and the suite correctly identifies the actual behavior vs. docstring behavior distinction. The lazy evaluation test with tracked consumption is particularly insightful. Minor issue: the `test_lazy_evaluation_does_not_consume_beyond_max_items` test's expected consumed list may be brittle/incorrect depending on heap ordering, but overall the suite is" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 8, "brief_justification": "The test suite is well-organized with clear class groupings and covers most important cases: empty inputs, duplicates, max_items variations, and sorting validation. Parametrized tests are notably absent despite being requested. The response appears truncated at the end, cutting off a test case. The negative max_items test correctly identifies the behavior. Missing parametrized tests for common scenarios and some edge cases like single-element streams, generator inputs, and very large streams. Th" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 1.2, "brief_justification": "The response is incomplete - it cuts off mid-sentence without providing any actual test code. Only a brief introduction and an incomplete import section are present. No tests were written, no edge cases covered, no parametrized tests included. The response is essentially useless as delivered." }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 8, "brief_justification": "The test suite is comprehensive and well-organized, covering typical usage, edge cases, error cases, parametrized tests, and boundary conditions. Tests are clearly named and structured in a class. Minor issues: the lazy consumption assertion (call_count == 3) may be incorrect depending on implementation details; the negative max_items test expectation may be wrong (the loop condition `count < max_items` with negative max_items would immediately fail, yielding nothing); the response appears cut o" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8.35, "brief_justification": "The test suite is well-structured and covers most important cases including empty streams, edge cases, error conditions, parametrized tests, and performance. Minor issues: the unsorted stream test doesn't verify the error message content; the duplicate items expected output [1,2,2,2,3,3,4] is correct but worth double-checking; mixed types test is a reasonable addition though not explicitly in the function spec. Missing tests for: single-item streams, max_items=1, streams that are iterators (not " }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 7.35, "brief_justification": "The test suite is well-structured with good parametrization covering typical usage, max_items boundary conditions, and error cases. Tests for generators and custom comparable objects are included. However, the response is cut off mid-class definition, leaving the Comparable class incomplete. There's also a subtle correctness issue with test_merge_sorted_streams_unsorted_late_detection - the error message check for 'Stream 2' may not be reliable given how the heap reorders items. The test for max" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.15, "brief_justification": "The test suite is well-structured and covers most important cases: typical usage, max_items parametrization, empty inputs, generators, error handling, and data types. The unsorted mid-stream test is a nice touch. Minor gaps: no test for a single-element stream, no test for max_items=None explicitly, the unsorted mid-stream test's expected sequence reasoning is slightly off (10 would be yielded before 2 is encountered, but the assertion sequence needs verification), and there's no test for stream" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 7, "brief_justification": "The response starts well with good test organization, fixtures, parametrized tests, and clear class structure. However, the response is cut off mid-test, missing critical test cases for: unsorted stream ValueError, max_items parameter (boundary at 0, 1, exact count, exceeding count), no streams passed, generator/iterator inputs, duplicate values across streams, negative numbers, and string types. The tests shown are correct and well-structured, but the incomplete response significantly reduces c" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 8, "brief_justification": "The test suite is well-organized with logical class groupings, good parametrization, and covers most edge cases including empty streams, generators, max_items boundaries, and error handling. The tests are mostly correct, though there's a minor issue with test_max_items_partial_extraction where the expected result [1,2,3,5] may not be accurate (should be [1,2,3,5] - actually correct). The response is cut off at the end (TestComplexScenarios is incomplete), which is a notable gap. The unsorted str" }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.6, "brief_justification": "Tests comprehensively cover typical cases, edge cases, max_items, errors, laziness, and exceptions. Matches actual implementation behavior (global order check) despite docstring. Minor deduction for clarity as some test names are long and one test has a misleading comment about consumption count." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 6.75, "brief_justification": "Tests cover main cases and edge cases well with good organization and use of classes. However, the function definition is duplicated unnecessarily, some tests are redundant, and the last test is incomplete/truncated. Parametrization is mentioned in the prompt but not used. The negative max_items test relies on implementation details rather than documented behavior." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 3.65, "brief_justification": "The response is incomplete: it only provides introductory text and a partial code skeleton without any actual test functions, parametrized tests, or coverage of edge cases as requested. It fails to deliver the comprehensive test suite promised." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 6.6, "brief_justification": "Tests cover main cases and parametrized scenarios but miss critical edge cases like the bug in error reporting (wrong stream_idx), non-comparable items within same stream, and proper validation of already-sorted streams with duplicates. Some tests (like large_streams) don't fully test the function's error-checking logic. Code is clear and well-organized." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 8.25, "brief_justification": "Tests are well-structured, parametrized, and cover typical cases, max_items, error handling, and some edges. However, the response is truncated mid-test (incomplete Comparable class and missing tests for non-comparable items, single-item streams, large max_items with many streams, and full coverage of all documented behaviors)." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.6, "brief_justification": "The tests are well-structured, cover all major cases including errors and boundaries, use parametrization effectively, and thoroughly validate the heap-based merging logic and validation. Minor deduction for not testing non-comparable types or very large inputs that could stress the heap." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 7.7, "brief_justification": "The tests are well-structured, clear, and cover many typical and boundary cases with good use of parametrization and fixtures. However, the response is truncated mid-test, missing coverage for max_items, error cases (unsorted streams), duplicates, negative numbers, and iterator consumption. The included function code is redundant." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.45, "brief_justification": "The tests are well-structured, clear, and cover most major cases (including parametrization and error handling). However, the code is truncated at the end, some tests are slightly redundant, and the error-checking logic in the function is flawed (it only validates across streams, not within a single stream properly), which the tests do not fully expose." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 9.6, "brief_justification": "Extensive coverage of edge cases, clear structure, and practical value." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 8.6, "brief_justification": "Comprehensive tests covering functionality, edge cases, duplicates, max_items, and sorting validation. Well-structured but could benefit from more parameterized tests." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 8.2, "brief_justification": "Comprehensive and well-structured, but lacks some edge case details." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 8.6, "brief_justification": "Comprehensive tests covering edge cases and typical usage, but missing some parametrized tests." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 9.35, "brief_justification": "Extensive test coverage with excellent handling of edge cases, clear organization, and practical value." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 9.05, "brief_justification": "Comprehensive tests covering typical usage, boundary conditions, error handling, and edge cases. Well-structured and clear." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.25, "brief_justification": "Comprehensive and well-structured tests covering all key aspects." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 9.6, "brief_justification": "Comprehensive coverage of edge cases and typical usage with clear, well-structured tests." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 8.8, "brief_justification": "Highly accurate and thorough tests covering all specified cases." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.8, "brief_justification": "The suite thoroughly tests typical, edge, and error cases, uses parametrization effectively, and includes deeper aspects like laziness and exception propagation, though minor naming/formatting quirks keep clarity just below perfect." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 6.2, "brief_justification": "The response provides a solid set of pytest cases covering basic, empty, duplicate, max_items, and unsorted scenarios, but lacks parametrized tests as requested, includes an unfinished test causing syntax errors, and has minor unused imports, limiting its overall correctness and completeness." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 2.2, "brief_justification": "The answer is incomplete, providing only an introductory comment and no actual test code, so it fails to meet the request; clarity is moderate but overall correctness, completeness, depth, and usefulness are low." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 7.55, "brief_justification": "The answer offers a wide range of pytest cases with clear organization and good coverage, but contains several logical errors (e.g., negative max_items handling, misuse of list exhaustion checks) and an incomplete test, reducing overall correctness and practical usefulness." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8.8, "brief_justification": "The test suite accurately covers empty, single, multiple, varied-length, and edge-case streams, includes max_items limits, error handling, parametrized cases, and a large-data sanity check, all presented clearly and ready for pytest." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.8, "brief_justification": "Tests are accurate, cover typical, edge, and error cases, clearly written, and provide practical pytest suite." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 6.45, "brief_justification": "The provided tests are well‑structured and mostly correct, but the answer is truncated and omits important cases such as max_items limits, unsorted stream errors, and thorough parametrization, reducing overall completeness and depth." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.45, "brief_justification": "The answer provides a well‑structured, extensive pytest suite covering typical usage, edge cases, max_items, and error handling, with clear code and parametrization. However, the final test class is cut off and some less common scenarios (e.g., non‑iterable inputs, mixed types) are omitted, slightly reducing completeness and overall usefulness." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 10, "brief_justification": "The response provides an exceptionally thorough test suite using pytest. It covers standard cases, edge cases, and complex behaviors like lazy evaluation and iterator exception propagation. The inclusion of parametrization and the insightful note about the implementation's validation logic (global vs. local sorting) demonstrates high expertise." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 2.85, "brief_justification": "The response is incomplete and cut off mid-sentence. It fails to provide the actual unit tests requested, rendering it largely useless despite a correct initial description of what it intended to cover." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 7.85, "brief_justification": "The tests provided are high quality, well-organized, and cover a wide range of edge cases including empty streams, interleaved data, and negative numbers. However, the response is incomplete as it cuts off mid-sentence during a parametrized test, and it fails to include tests for the 'ValueError' (unsorted streams) and 'max_items' logic mentioned in the prompt." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 9.6, "brief_justification": "The response provides a very high-quality suite of pytest unit tests. It covers basic functionality, edge cases (empty streams, no streams), error cases (unsorted streams), and specific implementation details like lazy evaluation and the max_items parameter. The use of parametrization and clear docstrings makes the tests maintainable and thorough. The only minor omission is the completion of the final generator test, which was cut off, but the preceding content is more than sufficient." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 9.8, "brief_justification": "The response provides a comprehensive and high-quality suite of pytest unit tests. It covers all requested edge cases, including empty inputs, limiters, unsorted streams, and type errors. The use of parametrization and generators shows a deep understanding of Python testing best practices." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 9, "brief_justification": "The response provides a very high-quality test suite using pytest. It covers basic usage, boundary conditions for max_items, and error handling for unsorted streams. The code is well-structured and uses parametrization effectively. The only minor issue is the truncated code at the very end (the Comparable class), but the core testing logic is complete and functional." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 6.85, "brief_justification": "The response is well-structured and the tests provided are high quality; however, the response is incomplete and cuts off mid-sentence in the final test class, missing the error case tests and max_items tests requested." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 9.15, "brief_justification": "The test suite is excellent, covering standard usage, edge cases, boundary conditions for max_items, and error handling for unsorted streams. It uses pytest features like parametrization effectively. The response was slightly cut off at the very end of the last test case, but the provided code is fully functional and comprehensive." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.8, "brief_justification": "Comprehensive pytest suite covering all major edge cases, boundary conditions, and error scenarios. Well-organized with parametrized tests, clear naming, and good documentation of the function's actual behavior vs. documented behavior. Includes tests for lazy evaluation, stability, exception propagation, and input preservation." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 7.45, "brief_justification": "Well-organized tests covering basic functionality, empty inputs, duplicates, max_items, and sorting validation. However, the response is incomplete - the last test is cut off mid-definition with no assertion. Missing tests for generators/lazy evaluation and different data types." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 1.2, "brief_justification": "Response is incomplete and cut off mid-sentence. No actual test code was provided despite claiming to cover typical usage, boundary conditions, edge cases, and error handling. The response is essentially unusable." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 7.45, "brief_justification": "Well-organized tests covering many cases but response is incomplete (cut off mid-test). Missing tests for max_items parameter and ValueError for unsorted streams." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 8.2, "brief_justification": "Comprehensive pytest suite covering basic functionality, empty streams, max_items parameter, unsorted error cases, type variations, large data, and lazy iterator behavior. Well-organized with parametrized tests. Minor issue: test_exhausts_all_streams incorrectly tests list exhaustion instead of iterator exhaustion." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8.6, "brief_justification": "Comprehensive test suite covering edge cases, error conditions, boundary conditions, and typical usage. Well-structured with clear naming, good docstrings, and parametrized tests. Minor deduction for completeness (could add float/None/custom object tests) and the import assumes a specific file structure." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 7.25, "brief_justification": "Well-structured tests covering typical usage, boundary conditions, and error cases. However, the response is incomplete - the Comparable class definition is cut off mid-line, and some edge cases are missing (single empty stream, single element streams, None values, mixed types). The core test logic is correct but the file ends prematurely." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.2, "brief_justification": "Well-organized tests with good structure and parametrization. Tests cover standard usage, edge cases, boundary conditions, and error handling. However, the response is truncated (last test incomplete) and missing some edge cases like floats, negative numbers, and None values in streams." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.35, "brief_justification": "Tests cover many edge cases and are well-structured, but some tests could be more precise about the function's actual behavior vs. docstring claims." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 7.8, "brief_justification": "Good coverage of basic cases, empty inputs, duplicates, and max_items. Missing tests for non-iterables, non-comparable items, and unsorted detection with max_items. Tests are well-structured." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 9, "brief_justification": "The response provides a comprehensive test suite covering typical usage, edge cases (empty streams, single items), boundary conditions (max_items), and error cases (unsorted input). It uses parametrization effectively and includes advanced tests for infinite streams and stability. The only minor deduction is for the placeholder comment in the code block, but the actual test logic is robust and accurate." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 8, "brief_justification": "Solid test suite covering core functionality, edge cases, and parametrization. Missing explicit tests for unsorted input detection and max_items behavior, and the response is truncated." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 8.8, "brief_justification": "Excellent coverage of edge cases including unsorted detection, max_items boundary, and lazy evaluation. Missing a few specific edge cases like max_items negative behavior and unsorted detection across streams, but overall very thorough." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8.6, "brief_justification": "Excellent test coverage with good structure. Missing edge case: unsorted stream detection when unsorted item appears after max_items limit. Otherwise comprehensive." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 8.55, "brief_justification": "Comprehensive test suite covering typical usage, boundary conditions, error cases, and edge cases with parametrized tests. Minor issue: incomplete Comparable class definition in the response." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7.8, "brief_justification": "Tests cover typical usage, edge cases, and error handling, but missing some boundary conditions like unsorted stream detection with equal items and max_items with zero streams." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 8.6, "brief_justification": "Excellent coverage of typical usage and boundary conditions with parametrized tests. Missing tests for max_items edge cases (0, exact count) and duplicate handling across streams, but overall very thorough." } ], "meta": { "source": "The Multivac (app.themultivac.com)", "methodology": "10x10 blind peer matrix evaluation", "criteria": "correctness, completeness, clarity, depth, usefulness", "self_judgments": "excluded from rankings", "license": "Open data — cite as: The Multivac (2026)" } }