{
  "evaluation_id": "EVAL-20260402-140852",
  "question_id": "CODE-021",
  "question_text": "Write a Python function that parses unified diff format (the output of `git diff`) and returns a structured representation: files changed, lines added/removed/modified, hunks with context. Handle edge cases: binary files, renamed files, mode changes, and empty diffs. Include tests with real diff examples.",
  "category": "code",
  "timestamp": "2026-04-02T14:08:52.478Z",
  "display_date": "Apr 02, 2026",
  "winner": {
    "name": "Gemini 3 Flash Preview",
    "provider": "Google",
    "score": 8.03
  },
  "avg_score": 6.0088887,
  "matrix_size": 74,
  "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": "mimo_v2_flash",
      "name": "MiMo-V2-Flash",
      "provider": "Xiaomi"
    },
    {
      "id": "gpt_5_4",
      "name": "GPT-5.4",
      "provider": "openrouter"
    }
  ],
  "rankings": {
    "gemini_3_flash": {
      "display_name": "Gemini 3 Flash Preview",
      "provider": "Google",
      "average_score": 8.03,
      "score_count": 9,
      "min_score": 6.8,
      "max_score": 9,
      "rank": 1
    },
    "gpt_5_4": {
      "display_name": "GPT-5.4",
      "provider": "openrouter",
      "average_score": 7.92,
      "score_count": 8,
      "min_score": 7,
      "max_score": 9,
      "rank": 2
    },
    "grok_420": {
      "display_name": "Grok 4.20",
      "provider": "openrouter",
      "average_score": 7.39,
      "score_count": 8,
      "min_score": 6,
      "max_score": 9.15,
      "rank": 3
    },
    "claude_opus_46": {
      "display_name": "Claude Opus 4.6",
      "provider": "openrouter",
      "average_score": 6.53,
      "score_count": 9,
      "min_score": 2.25,
      "max_score": 9,
      "rank": 4
    },
    "deepseek_v4": {
      "display_name": "DeepSeek V4",
      "provider": "openrouter",
      "average_score": 6.46,
      "score_count": 8,
      "min_score": 5,
      "max_score": 8.15,
      "rank": 5
    },
    "gpt_oss_120b": {
      "display_name": "GPT-OSS-120B",
      "provider": "OpenAI",
      "average_score": 6.28,
      "score_count": 8,
      "min_score": 2.8,
      "max_score": 8.8,
      "rank": 6
    },
    "claude_sonnet_46": {
      "display_name": "Claude Sonnet 4.6",
      "provider": "openrouter",
      "average_score": 5.49,
      "score_count": 8,
      "min_score": 1.65,
      "max_score": 8.6,
      "rank": 7
    },
    "mimo_v2_flash": {
      "display_name": "MiMo-V2-Flash",
      "provider": "Xiaomi",
      "average_score": 4.36,
      "score_count": 9,
      "min_score": 2.45,
      "max_score": 8.6,
      "rank": 8
    },
    "gemini_31_pro": {
      "display_name": "Gemini 3.1 Pro",
      "provider": "openrouter",
      "average_score": 1.62,
      "score_count": 7,
      "min_score": 0.2,
      "max_score": 4,
      "rank": 9
    }
  },
  "judgments": [
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 2.25,
      "brief_justification": "The response starts with a promising design and data model, but the actual function is truncated mid-implementation and does not include the full parser or any tests. It is partially clear, but incomplete and not practically usable as delivered."
    },
    {
      "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 incomplete and does not provide the requested Python function, structured representation, or actual tests. It only lists partial test ideas, so it has minimal usefulness despite being somewhat readable."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "claude_sonnet_46",
      "respondent_name": "Claude Sonnet 4.6",
      "weighted_score": 1.65,
      "brief_justification": "The response is incomplete and cuts off mid-function, so it does not provide a working parser or the requested tests. What is present is reasonably structured, but it fails to satisfy the main requirements."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 6,
      "brief_justification": "Well-structured and mostly clear, but the solution is incomplete and has notable correctness issues: rename handling misses 'rename to', copy detection logic is flawed, mode changes are misinterpreted from index lines, context lines are initially counted as modified, and the provided tests are unfinished and include at least one inconsistent assertion."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 5,
      "brief_justification": "Readable and partially correct, but the parser has significant flaws: it fails to append the final hunk at EOF, modified-line counting is not valid for unified diffs, mode-change parsing is too narrow for real git output, binary path handling is inconsistent, and the tests are incomplete/truncated. It addresses some requested edge cases conceptually, but not thoroughly or robustly."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 2.8,
      "brief_justification": "The response starts with a promising design and data model, but the actual parser implementation is cut off mid-function at the first hunk parse, so it is not executable and does not fulfill the request. It mentions edge cases and tests, but neither the full handling logic nor tests are provided."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 6.8,
      "brief_justification": "Clear and mostly accurate parser with solid tests for basic git diff cases, but it does not fully meet the requested structured output for modified lines/context, misses some git binary and metadata edge cases, and has state-reset limitations around hunks and file sections."
    },
    {
      "judge_key": "gpt_5_4",
      "judge_name": "GPT-5.4",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 2.45,
      "brief_justification": "The response is incomplete and contains clear correctness issues, including unfinished code, broken rename parsing, and unresolved iterator/pushback logic. It does not fully handle the requested edge cases or include the promised tests, though the intended structure and some parsing considerations are somewhat clear."
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 7.8,
      "brief_justification": "The implementation is well-structured with clear dataclasses and handles the main edge cases (binary files, renames, mode changes, empty diffs). The modified lines computation using paired add/del is a thoughtful approach. However, the test suite appears truncated (test_binary_file is cut off), missing tests for renamed files, mode changes, new/deleted files, and multi-file diffs. The parser correctly handles most unified diff features but could miss some edge cases like copy detection or combin"
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 0.65,
      "brief_justification": "The response is essentially just a planning outline or fragment, not an actual implementation. It provides no Python function, no structured representation, no parsing logic, and no actual tests. It appears to be an incomplete thought or outline rather than a response 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": 4.45,
      "brief_justification": "The response is cut off mid-implementation - the parser function is incomplete, missing the core parsing logic. The data model is well-designed with good dataclasses, enums, and regex patterns, but without the actual parsing logic and without the promised tests, the code is non-functional. The structured representation design shows good understanding of the problem domain, but the response fails to deliver a working solution."
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 6.4,
      "brief_justification": "The solution covers the main cases (simple modifications, binary files, renames, new files, deleted files, mode changes, empty diffs) but has notable issues. The 'modified' count on context lines is misleading before post-processing overwrites it. The mode_change field captures the index hash range rather than actual mode changes (old mode/new mode lines aren't parsed). The 'rename to' line is never handled (only 'rename from'). The test suite is incomplete - Test 5 is cut off, there's no test f"
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 5.4,
      "brief_justification": "The response is cut off mid-test, missing several test cases (mode changes, multiple files, etc.). The parser has significant bugs: the mode_change_re regex tries to match 'old mode' and 'new mode' on a single line but they appear on separate lines in real git diff output; the last hunk of each file is never appended to hunks list because the append only happens when a non-hunk line is encountered (missing finalization logic); the 'modified_lines' counting logic is flawed and doesn't properly de"
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 5.25,
      "brief_justification": "The response is cut off mid-code - the parser function is incomplete (stops at 'old_start = int'), the hunk line parsing logic is missing, and the promised test suite is entirely absent. The data model design is solid and well-documented, the regex patterns are appropriate, and the approach is sound. However, since the core parsing logic (hunk body processing, new/deleted file detection refinement) and all tests are missing, the response fails to deliver a working solution. The structural design"
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 7.8,
      "brief_justification": "The implementation is correct and handles the main edge cases (binary, rename, mode change, empty diff). The state-machine approach is sound. However, there are some gaps: the regex for `diff --git` can fail with paths containing spaces; the `rename from` line overwrites the old_path already extracted from the diff header (which is actually fine but order-dependent); there's no handling of copy detection, submodule diffs, or combined diffs; the test suite is decent but could be more comprehensiv"
    },
    {
      "judge_key": "claude_opus_46",
      "judge_name": "Claude Opus 4.6",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 3.25,
      "brief_justification": "The implementation is incomplete and broken. The code cuts off mid-comment, the _parse_hunk method is never defined, the rename parsing has bugs (wrong regex group names), the pushback problem is acknowledged but never solved, and the architecture has fundamental flaws (consuming lines from an iterator without ability to push back). No tests are included despite being explicitly requested. The code would not run as-is. While the data structures (namedtuples) and regex patterns show some understa"
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 7.4,
      "brief_justification": "The code is well-structured and handles the requested edge cases effectively, but the response is truncated at the end of the test suite, resulting in incomplete code."
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 4.9,
      "brief_justification": "The response cuts off mid-implementation. While the data structures and regex patterns are well-designed, the parsing logic is incomplete and the requested tests are entirely missing."
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "claude_sonnet_46",
      "respondent_name": "Claude Sonnet 4.6",
      "weighted_score": 4.7,
      "brief_justification": "The response provides an excellent data model and regex definitions, showing deep understanding of edge cases. However, the code is severely truncated, missing the core parsing logic and the requested tests, rendering it unusable."
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 7.25,
      "brief_justification": "The code is well-structured and handles the requested edge cases effectively using regex and dataclasses. However, the response is abruptly truncated at the end, leaving the tests incomplete."
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 4.55,
      "brief_justification": "The response provides a well-structured and clear start to the parser, but it is severely truncated, missing the core hunk parsing logic and the requested tests."
    },
    {
      "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,
      "brief_justification": "The response provides a robust, state-machine-based Python parser that successfully handles all requested edge cases, accompanied by a well-structured test suite."
    },
    {
      "judge_key": "gemini_31_pro",
      "judge_name": "Gemini 3.1 Pro",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 3.25,
      "brief_justification": "The response is incomplete, cuts off abruptly, fails to implement hunk parsing, lacks the requested tests, and contains unresolved architectural issues regarding iterator pushback."
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 8,
      "brief_justification": "The implementation is well-structured with proper dataclasses, handles most edge cases (binary files, renames, mode changes, empty diffs), and includes clear tests. The modified_lines computation logic is thoughtful. Minor issues: the test file appears truncated (binary file test cut off), the `old_count` default of 1 when omitted is correct per unified diff spec, and the empty line handling inside hunks is reasonable. The a_path/b_path vs old_path/new_path duplication is slightly redundant but "
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 6.3,
      "brief_justification": "The response shows good design with well-structured dataclasses, enums, and regex patterns. The code is clean and readable with good documentation. However, the response is incomplete - it cuts off mid-function during the extended header parsing section, missing the core parsing logic, hunk processing, line number tracking, and most critically, the promised tests with real diff examples. The data model design is solid but without the complete implementation and tests, the response fails to deliv"
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 0.2,
      "brief_justification": "The response is completely incomplete - it appears to be a fragment of planning text rather than an actual implementation. No Python function was provided, no parsing logic, no tests, and no structured representation. The response is essentially unusable."
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 7.2,
      "brief_justification": "The solution is well-structured with dataclasses and a clear parsing approach. It handles most edge cases (binary files, renames, new/deleted files, mode changes). However, there are some issues: 'modified' lines are incorrectly counted as context lines initially then recalculated, the 'rename to' line isn't explicitly handled (relies on diff --git header), mode changes parsing from 'index' line is fragile, and the test suite is incomplete (Test 5 is cut off). The walrus operator usage requires "
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 6.4,
      "brief_justification": "The response provides a solid foundation with good structure (Hunk/FileDiff classes), handles most edge cases (binary, rename, mode change, empty diff), and includes tests. However, there are issues: the hunk termination logic is flawed (hunks aren't properly appended when a new hunk starts), the 'modified_lines' counting logic is incorrect/nonsensical, the binary file regex won't match git's actual format ('a/image.png' prefix handling is inconsistent), the mode_change regex won't work as writt"
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 7,
      "brief_justification": "The response demonstrates solid understanding of unified diff format with well-structured dataclasses and regex patterns. The code is clean and well-documented. However, the response is cut off mid-implementation (the hunk parsing and line processing logic is missing, as is the test suite that was explicitly requested). The incomplete code significantly reduces completeness and usefulness scores. What exists is correct and well-designed, but the missing portions (hunk body parsing, change_type r"
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 7.35,
      "brief_justification": "The implementation is well-structured and handles most key cases (binary, renamed, mode changes, empty diffs). However, there are some correctness issues: the regex for extracting paths from 'diff --git' line fails for filenames with spaces; the hunk line count default of 1 when omitted is wrong (omitted means 1 line but the regex fallback logic could be cleaner); the 'old mode'/'new mode' handling doesn't set status to 'mode_changed'. The test suite is reasonable but lacks tests for new/deleted"
    },
    {
      "judge_key": "claude_sonnet_46",
      "judge_name": "Claude Sonnet 4.6",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 4.05,
      "brief_justification": "The implementation is incomplete - it cuts off mid-comment, the rename regex has a bug (group named 'old' in RE_RENAME_TO), the iterator pushback problem is acknowledged but never solved, and there are no tests included despite being explicitly requested. The architecture has fundamental flaws (can't handle 'diff --git' boundaries properly) that are noted but not fixed. The data structures are well-designed, but the core parsing logic is broken and the response is truncated."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 7.05,
      "brief_justification": "The response provides a very high-quality, well-structured data model and regex-based parser logic. However, the code is incomplete; it cuts off mid-function in the hunk parsing section, making it non-functional without manual completion. It also misses the requested test suite."
    },
    {
      "judge_key": "grok_420",
      "judge_name": "Grok 4.20",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 7,
      "brief_justification": "The parser handles core cases, edge cases like renames/binary/mode changes, and includes tests. However, the _compute_modified_lines logic is flawed (test 2 expects modified=1 but code counts 0; test 3 expects modified=1/added=1/removed=0 but code would count differently). The test class is incomplete (truncated). Code is well-structured with dataclasses and regex."
    },
    {
      "judge_key": "grok_420",
      "judge_name": "Grok 4.20",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 7.9,
      "brief_justification": "The code provides a well-structured, clear, and mostly correct parser with good dataclasses and regexes for unified diffs. However, it is incomplete: the main parse_diff function is truncated mid-implementation, leaving core parsing logic (hunks, lines, binary handling, edge cases) unimplemented."
    },
    {
      "judge_key": "grok_420",
      "judge_name": "Grok 4.20",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 6.2,
      "brief_justification": "The parser handles basic cases and some edge cases but has bugs in line counting, modified_lines logic, incomplete test class, and misses some git diff header patterns (e.g. ---/+++ lines). Structure is clear and mostly well-organized."
    },
    {
      "judge_key": "grok_420",
      "judge_name": "Grok 4.20",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 7.75,
      "brief_justification": "The parser correctly handles core git diff cases with a stateful approach and includes tests, but has bugs: hunk regex doesn't fully match standard formats (missing optional parts), metadata parsing can fail due to missing continue statements after some elifs, and line counting in stats ignores context lines properly. Still useful and mostly accurate."
    },
    {
      "judge_key": "grok_420",
      "judge_name": "Grok 4.20",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 4.4,
      "brief_justification": "The code is incomplete (abruptly ends mid-comment), contains several bugs (e.g., incorrect regex group access for rename, flawed iterator handling without pushback), and only partially implements parsing for hunks and edge cases. It shows a reasonable structure and awareness of diff format complexities but fails to deliver a working, tested solution as requested."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 8.6,
      "brief_justification": "Comprehensive and well-structured with good handling of edge cases."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 9,
      "brief_justification": "Comprehensive and well-structured implementation covering all specified edge cases with clear documentation."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 4,
      "brief_justification": "Incomplete response, lacks implementation and proper structure."
    },
    {
      "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": "Well-structured and thorough with good handling of edge cases."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 8.8,
      "brief_justification": "Comprehensive and well-structured with good handling of edge cases."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 8.6,
      "brief_justification": "Comprehensive and accurate with good handling of edge cases."
    },
    {
      "judge_key": "deepseek_v4",
      "judge_name": "DeepSeek V4",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 8.6,
      "brief_justification": "Robust implementation with comprehensive handling of edge cases and clear data structures."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 7.8,
      "brief_justification": "The parser correctly handles core diff structures and many edge cases, with clear code and reasonable internal logic. Tests cover basic scenarios but are incomplete for binary, rename, and mode changes, limiting full verification."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 4.8,
      "brief_justification": "The response outlines a solid data model and initial parsing logic, but the implementation is incomplete and lacks the full parsing flow and test cases, limiting its correctness and usefulness."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 1.4,
      "brief_justification": "Response lacks the required Python function, structured output, and actual test implementations; only lists test topics, providing minimal clarity and little usefulness."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "claude_sonnet_46",
      "respondent_name": "Claude Sonnet 4.6",
      "weighted_score": 4.15,
      "brief_justification": "The response defines a solid data model and regexes, but the parser function is incomplete and no tests are provided, making it non-functional despite clear presentation."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 7,
      "brief_justification": "Provides a functional parser covering most requested features and includes tests, but has minor inaccuracies and incomplete test for empty diff."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 6.15,
      "brief_justification": "The answer provides a clear, well-structured parser and useful test examples, covering many common diff scenarios. However, the implementation has logical gaps (e.g., missing final hunk handling, simplistic modified line detection) and incomplete test coverage, limiting accuracy and overall utility."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 8.35,
      "brief_justification": "The parser correctly handles core diff structures and key edge cases, includes comprehensive tests, and is clearly written, though it may miss some rare diff nuances."
    },
    {
      "judge_key": "gpt_oss_120b",
      "judge_name": "GPT-OSS-120B",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 2.85,
      "brief_justification": "The answer provides a partial implementation that is unfinished and contains logical gaps, missing handling for many edge cases, no test suite, and incomplete code, reducing accuracy and practical value."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 9,
      "brief_justification": "The code is well-structured, using dataclasses for a clean API. It correctly handles complex git diff features like renames, mode changes, and binary flags. The logic for calculating 'modified' lines (pairing additions and deletions) adds significant value beyond a basic parser. The tests are good, though the final test case was cut off."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 8.45,
      "brief_justification": "The code is architecturally sound, using dataclasses and Enums for a clean structured representation. It handles complex git diff metadata like modes and renames. However, the provided snippet is truncated (ends mid-function), which affects completeness and immediate usability."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 1.65,
      "brief_justification": "The response is a placeholder or a plan rather than an actual implementation. It fails to provide the requested Python function, logic, or actual test code, providing only a list of test cases 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": 7.05,
      "brief_justification": "The response provides a very high-quality data model and robust regex patterns for parsing git diffs. However, the actual parser function is truncated and incomplete, and the requested tests were not included. While the architecture is excellent, it is not a functional solution as provided."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 9.15,
      "brief_justification": "The solution is robust, well-structured, and handles the requested edge cases (binary, renames, mode changes). The logic for calculating modified lines is a thoughtful addition, and the tests cover the primary scenarios."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 8.15,
      "brief_justification": "The code is well-structured and handles the requested edge cases (binary, rename, mode changes). However, the test suite is truncated at the end, and the logic for 'modified_lines' is a bit simplistic compared to how git actually calculates modifications."
    },
    {
      "judge_key": "gemini_3_flash",
      "judge_name": "Gemini 3 Flash Preview",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 5.85,
      "brief_justification": "The response is incomplete and contains significant logical flaws. The implementation stops mid-sentence during the explanation of the iterator logic, and the code for `_parse_hunk` is missing entirely. Furthermore, the regex for renames is logically inconsistent with its group names, and the requested test suite with real diff examples was not provided."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 6.55,
      "brief_justification": "Well-structured code with comprehensive data structures and good edge case handling. However, the implementation is incomplete - the parse_diff function body ends abruptly mid-function, and no tests are included as requested. The response covers the theory well but fails to provide a working solution."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "claude_sonnet_46",
      "respondent_name": "Claude Sonnet 4.6",
      "weighted_score": 6.35,
      "brief_justification": "Well-structured data model with comprehensive edge case handling, but the response is incomplete - the parse_diff function is cut off mid-implementation and there are no tests as requested."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 7.55,
      "brief_justification": "Well-structured code with dataclasses and regex parsing. Handles most edge cases (binary files, renames, mode changes) but Test 5 for empty diffs is incomplete. Some minor logic issues with similarity index detection. Clear and practical with good test coverage."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 7.25,
      "brief_justification": "Correctly parses most diff scenarios with proper structure. Handles binary files, renames, mode changes, and empty diffs. Type hints and classes improve clarity. However, depth is limited - missing explanation of diff format, some edge cases like symlinks/new files not fully covered, and modified_lines calculation is simplistic. Test suite is good but incomplete (last test is truncated)."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 6.65,
      "brief_justification": "Well-structured and clear implementation with good depth, but the code is incomplete (cuts off mid-parsing) and promised tests are missing."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 8,
      "brief_justification": "Well-structured parser with state-machine approach handling all requested edge cases. Tests cover real diff examples for modifications, renames, mode changes, and binary files. Minor gaps like similarity index not captured, but core functionality is solid and production-ready."
    },
    {
      "judge_key": "minimax_m25",
      "judge_name": "MiniMax M2.5",
      "respondent_key": "mimo_v2_flash",
      "respondent_name": "MiMo-V2-Flash",
      "weighted_score": 4.5,
      "brief_justification": "Implementation is incomplete - code ends abruptly with unfinished comments and no tests included as requested. Has bugs in rename handling and lacks proper iterator pushback mechanism."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "gpt_5_4",
      "respondent_name": "GPT-5.4",
      "weighted_score": 7.8,
      "brief_justification": "The code is well-structured and handles the core requirements and most edge cases correctly. The logic for counting modified lines is sophisticated. However, the test suite is incomplete (tests are cut off), and the parser misses a specific edge case (binary diffs without 'Binary files' header)."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "claude_opus_46",
      "respondent_name": "Claude Opus 4.6",
      "weighted_score": 8.6,
      "brief_justification": "Comprehensive parser with well-structured dataclasses, handles edge cases, includes regex patterns, but incomplete code and missing tests."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "gemini_31_pro",
      "respondent_name": "Gemini 3.1 Pro",
      "weighted_score": 2.8,
      "brief_justification": "Response is incomplete and lacks the actual Python function or tests; only a partial test list is provided, failing to address the core request."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "claude_sonnet_46",
      "respondent_name": "Claude Sonnet 4.6",
      "weighted_score": 7,
      "brief_justification": "Function is well-structured with good data models and regex patterns, but incomplete (parser stops mid-function) and lacks tests, reducing completeness and usefulness."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "grok_420",
      "respondent_name": "Grok 4.20",
      "weighted_score": 8.6,
      "brief_justification": "Comprehensive solution with good structure, handles edge cases, and includes tests; minor issue with incomplete test suite."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "deepseek_v4",
      "respondent_name": "DeepSeek V4",
      "weighted_score": 7.15,
      "brief_justification": "Function is well-structured and handles many edge cases, but has a bug in modified line counting and incomplete test cases."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "gpt_oss_120b",
      "respondent_name": "GPT-OSS-120B",
      "weighted_score": 8.1,
      "brief_justification": "The response provides a well-structured, self-contained parser with a clear data model and handles many edge cases. However, the code is incomplete (cuts off mid-function) and lacks the full implementation and tests, which affects correctness and completeness."
    },
    {
      "judge_key": "mimo_v2_flash",
      "judge_name": "MiMo-V2-Flash",
      "respondent_key": "gemini_3_flash",
      "respondent_name": "Gemini 3 Flash Preview",
      "weighted_score": 8.6,
      "brief_justification": "Accurate and thorough implementation with clear structure, good edge case handling, and practical tests."
    }
  ],
  "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)"
  }
}