{ "evaluation_id": "EVAL-20260402-131157", "question_id": "CODE-012", "question_text": "Implement a production-ready circuit breaker pattern in Python. It should support three states (closed, open, half-open), configurable failure thresholds, automatic recovery with exponential backoff, proper async support, and metrics collection. Include usage example wrapping an HTTP client.", "category": "code", "timestamp": "2026-04-02T13:11:57.792Z", "display_date": "Apr 02, 2026", "winner": { "name": "Grok 4.20", "provider": "openrouter", "score": 7.44 }, "avg_score": 6.101, "matrix_size": 87, "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": { "grok_420": { "display_name": "Grok 4.20", "provider": "openrouter", "average_score": 7.44, "score_count": 9, "min_score": 5, "max_score": 9.15, "rank": 1 }, "gemini_3_flash": { "display_name": "Gemini 3 Flash Preview", "provider": "Google", "average_score": 7.03, "score_count": 9, "min_score": 5.3, "max_score": 9.6, "rank": 2 }, "gpt_5_4": { "display_name": "GPT-5.4", "provider": "openrouter", "average_score": 7, "score_count": 8, "min_score": 3.6, "max_score": 9, "rank": 3 }, "claude_opus_46": { "display_name": "Claude Opus 4.6", "provider": "openrouter", "average_score": 6.82, "score_count": 9, "min_score": 3.05, "max_score": 9.6, "rank": 4 }, "mimo_v2_flash": { "display_name": "MiMo-V2-Flash", "provider": "Xiaomi", "average_score": 6.6, "score_count": 9, "min_score": 4.15, "max_score": 9.15, "rank": 5 }, "deepseek_v4": { "display_name": "DeepSeek V4", "provider": "openrouter", "average_score": 6.23, "score_count": 9, "min_score": 3.8, "max_score": 8.55, "rank": 6 }, "gpt_oss_120b": { "display_name": "GPT-OSS-120B", "provider": "OpenAI", "average_score": 5.9, "score_count": 8, "min_score": 2.8, "max_score": 7.85, "rank": 7 }, "claude_sonnet_46": { "display_name": "Claude Sonnet 4.6", "provider": "openrouter", "average_score": 5.84, "score_count": 9, "min_score": 3.05, "max_score": 8.6, "rank": 8 }, "minimax_m25": { "display_name": "MiniMax M2.5", "provider": "openrouter", "average_score": 4.92, "score_count": 9, "min_score": 1.85, "max_score": 7.8, "rank": 9 }, "gemini_31_pro": { "display_name": "Gemini 3.1 Pro", "provider": "openrouter", "average_score": 3.23, "score_count": 8, "min_score": 0.65, "max_score": 8.4, "rank": 10 } }, "judgments": [ { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 9.6, "brief_justification": "The implementation is exceptionally high quality, featuring thread-safety, sliding window metrics, and exponential backoff. It correctly handles both sync and async contexts and provides a clear, production-ready structure." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 3.25, "brief_justification": "The response is incomplete and cut off after the initial imports and class definition. It fails to provide the actual implementation, the requested exponential backoff logic, or the usage example." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 3.05, "brief_justification": "The response starts with a plausible design and some solid components, but it is incomplete and cut off before the actual circuit breaker implementation, async handling, backoff logic integration, and HTTP client usage example. As provided, it does not fully implement the requested production-ready solution." }, { "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 only provides a brief introduction and a truncated code header, without the actual implementation, explanation, metrics logic, async behavior, or HTTP client usage example. It is far from fulfilling the request." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 3.05, "brief_justification": "The response starts with a reasonable architecture and partial code, but it is incomplete and truncated mid-file, so it does not implement the requested production-ready circuit breaker. Key requirements like the full state machine logic, exponential backoff recovery, async support, and HTTP client usage example are missing." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 5, "brief_justification": "Clear structure and includes core states, async handling, backoff, and metrics, but the implementation is incomplete/truncated, has correctness issues for sync decorator support, unused/reset_timeout semantics, and lacks fully production-ready details like robust half-open concurrency control and a complete HTTP client example." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 3.8, "brief_justification": "The response starts with a reasonable design and includes states, thresholds, async calls, and basic metrics, but it is critically incomplete: the code is truncated, contains a broken async context manager, lacks the requested HTTP client usage example, and has production-readiness issues around locking/thread safety and half-open behavior." }, { "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 solid design and clear feature list, but the implementation is truncated mid-function, so it is not actually usable or production-ready. Key requested elements like full async support, metrics behavior, exponential backoff logic in operation, and HTTP client usage examples are incomplete or missing in the provided response." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 5.3, "brief_justification": "Clear and reasonably structured, but it misses key requested production features: no exponential backoff, weak concurrency control for half-open state, limited metrics, and not truly production-ready async/thread safety." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 1.85, "brief_justification": "The response is only a partial implementation sketch and is truncated before providing a working circuit breaker. It mentions required features, but does not actually implement async behavior, state transitions, exponential backoff logic, metrics collection, or the requested HTTP client usage example." }, { "judge_key": "gpt_5_4", "judge_name": "GPT-5.4", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 4.15, "brief_justification": "The response is structured and aims at the requested features, but the implementation has serious correctness issues: async methods are called without await, `_can_execute` is sync yet triggers async transition, half-open call limiting is not implemented, thread-safety claims are inaccurate, sync support is not really provided, and the usage example is incomplete/truncated. Metrics are minimal and not production-grade. Clear presentation, but not truly production-ready." }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 6.9, "brief_justification": "The implementation is well-structured with good design choices (exponential backoff, exception predicates, metrics, async locks, config validation). However, the code is clearly truncated - the _after_call_failure method is cut off mid-definition, and the crucial `call()` method, the usage example wrapping an HTTP client, and likely other important parts are missing. This significantly impacts completeness and usefulness since users cannot actually use this code as-is. The architectural decision" }, { "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 only provides a brief introduction and the very beginning of a code file (just import statements). None of the actual circuit breaker implementation is present: no state management, no failure thresholds, no exponential backoff, no metrics collection, no usage example. The response fails to deliver on essentially every requirement of 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": 5.5, "brief_justification": "The response demonstrates solid architectural thinking with a well-structured module layout, proper state diagram, and good separation of concerns (state, exceptions, metrics, config modules). However, the implementation is critically incomplete - it cuts off mid-sentence in config.py, and the core circuit breaker class itself (the actual state machine logic, async support, exponential backoff, and the decorator/context manager) is entirely missing. The HTTP client usage example is also absent. " }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 6.85, "brief_justification": "The implementation covers the three states, configurable thresholds, exponential backoff, async support, and metrics collection. However, there are several issues: (1) The response is truncated - the POST method and likely other usage examples are cut off. (2) There's a potential deadlock issue with re-entrant lock acquisition (_on_success and _on_failure acquire the lock that may already be held by execute). (3) The _should_open_circuit check happens inside the lock but then _on_failure also tr" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 5.6, "brief_justification": "The implementation is incomplete - the code is cut off mid-function (acontext), and critically, the usage example wrapping an HTTP client that was explicitly requested is entirely missing. There are also several correctness issues: the asyncio.Lock is created at __init__ time outside an event loop context, the _reset() call in _attempt_reset() clears failure_count before HALF_OPEN can properly track successes vs failures, the exponential backoff formula using math.exp grows extremely aggressivel" }, { "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-implementation - the sync `call` method is incomplete, the async `call_async` method is missing entirely, and the usage example wrapping an HTTP client is absent. The design and architecture shown are sound with good patterns (exponential backoff, thread safety, metrics), but the code literally stops in the middle of a try/except block. A production-ready implementation cannot be evaluated when it's incomplete. The explanation and structure up to the cutoff point are " }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 6, "brief_justification": "The implementation covers the three states and basic metrics, but has significant gaps for 'production-ready' code: no exponential backoff (the prompt explicitly required it), no thread safety/async lock for concurrent access, the HALF_OPEN state doesn't limit to a single trial request and doesn't transition back to OPEN on failure (the _on_failure method only opens when threshold is reached, but in HALF_OPEN the failure count may already be at threshold so behavior is fragile), and metrics are " }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 2.85, "brief_justification": "The response is severely incomplete - the implementation is cut off mid-constructor, missing the core logic for state transitions, the call method, metrics collection, exponential backoff implementation, the decorator, and the HTTP client usage example. While the initial structure and design choices described are reasonable and correct (enum states, async lock, backoff factor), the actual code provided is only a skeleton with class definitions and no functional implementation. This cannot be con" }, { "judge_key": "claude_opus_46", "judge_name": "Claude Opus 4.6", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 5.4, "brief_justification": "The implementation has several correctness issues: (1) _transition_to_half_open is called as a regular method from _can_execute (which is sync) but defined as async, so it returns a coroutine that's never awaited. (2) Similarly, _transition_to_closed is called from _record_success (async) but is defined as a sync method - this works but is inconsistent, and _record_success calls it without await which is fine since it's sync, but the pattern is confusing. (3) The _lock is asyncio.Lock but _can_e" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 5.35, "brief_justification": "The response starts with a high-quality implementation but is abruptly cut off, missing the failure handling logic, the execution wrapper, and the requested HTTP client usage example." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 5.7, "brief_justification": "The response provides a well-structured and high-quality start with excellent metrics tracking, but it cuts off prematurely, missing the core CircuitBreaker implementation, async support, and usage examples." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 4.55, "brief_justification": "The response cuts off abruptly mid-code block, missing the core circuit breaker logic, async support, exponential backoff, and the required usage example." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 6.65, "brief_justification": "The implementation covers the required features well, including async support, metrics, and backoff. However, the code is truncated at the end of the HTTP client example, and the sync decorator wrapper incorrectly returns a coroutine." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 4.45, "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": 4.75, "brief_justification": "The response cuts off abruptly mid-code, leaving it incomplete and unusable with a syntax error. Furthermore, the promised exponential backoff logic is missing from the state transition method." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 5.4, "brief_justification": "" }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 2.05, "brief_justification": "The response is severely truncated, cutting off in the middle of the class initialization. It fails to provide the requested implementation, async support, metrics, or usage example." }, { "judge_key": "gemini_31_pro", "judge_name": "Gemini 3.1 Pro", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 5.4, "brief_justification": "" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 7.05, "brief_justification": "The implementation is well-structured with good design choices including proper state management, exponential backoff, metrics collection, configurable thresholds, and async support. However, the response is cut off mid-implementation - the `_after_call_failure` method is incomplete, and the main `call` method, the HTTP client usage example, and other promised components are missing entirely. The code that exists is high quality and production-ready in design, but the truncation significantly im" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 7.5, "brief_justification": "The implementation is well-structured with excellent code organization, proper exception hierarchy, comprehensive metrics collection, and a clean configuration dataclass. The code quality is high with good type hints and documentation. However, the response is incomplete - it cuts off mid-implementation, missing the actual CircuitBreaker class with state machine logic, the async support implementation, exponential backoff logic, and the promised HTTP client usage example. The foundation shown is" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 1.85, "brief_justification": "The response is severely incomplete - it only shows imports and a brief description but cuts off before providing any actual implementation. The circuit breaker code, state management, metrics collection, and usage example are all missing. The response cannot be evaluated on technical merit as there is essentially no code to review." }, { "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 implementation covers the core circuit breaker pattern with three states, metrics, async support, and exponential backoff. However, there are notable issues: the lock is held during function execution in `execute()` which would serialize all calls (defeating the purpose), the response is cut off mid-sentence in the HTTP client example, the `_should_open_circuit` check happens before the OPEN state check creating a logic ordering issue, and the sync wrapper for the decorator doesn't properly " }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 6.85, "brief_justification": "The implementation covers the core circuit breaker pattern with three states, configurable thresholds, exponential backoff, async support, and metrics. Code is well-structured and readable. However, there are notable issues: the response is cut off mid-implementation (acontext method is incomplete, no usage example with HTTP client was provided), the asyncio.Lock is created incorrectly (always true since asyncio always has Lock), thread safety for sync calls is missing (no threading.Lock), the _" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 7.2, "brief_justification": "The implementation is well-structured with good design choices (separate config, metrics, state management, both sync/async locks). However, the response is cut off mid-implementation - the `call` method is incomplete, the async `call_async` method is missing, the exponential backoff logic for `_remaining_open_time` is absent, and the HTTP client usage example is never shown. The code that exists is correct and well-commented, but the truncation significantly impacts completeness and usefulness " }, { "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, "brief_justification": "The implementation is clean and well-structured with good async support and decorator pattern. However, it's missing several claimed features: exponential backoff is not implemented (recovery_timeout is fixed, not exponential), thread safety is absent (no locks for concurrent async access), half-open state only allows one probe but doesn't properly limit concurrent probes, metrics are minimal (no timestamps, rates, or latency tracking), and the expected_exception handling has a bug (using `type`" }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 5.3, "brief_justification": "The response starts well with good structure and correct concepts, but the implementation is cut off mid-way through the class definition, making it incomplete and non-functional. The promised features (decorator, metrics, HTTP client example) are never shown. What exists is correct but the truncation severely limits its value." }, { "judge_key": "claude_sonnet_46", "judge_name": "Claude Sonnet 4.6", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 6.6, "brief_justification": "The implementation has several issues: _transition_to_half_open and _transition_to_closed are called incorrectly (mixing sync/async calls within async contexts without await, and calling async methods from sync methods), the asyncio.Lock won't work properly in sync contexts, _can_execute calls _transition_to_half_open without await, and the response is cut off mid-code. The exponential backoff logic is flawed since failure_count grows unboundedly making recovery nearly impossible. The metrics re" }, { "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": "Excellent structure, metrics, and async foundations, but the implementation is incomplete: the core CircuitBreaker class, state machine logic, async/sync wrappers, decorator, and HTTP example are entirely missing." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 3.6, "brief_justification": "The response is incomplete as it cuts off before providing any actual implementation code, classes, or the usage example. While the intro text mentions relevant features, no functional code is delivered." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 6.4, "brief_justification": "The code provides a solid foundation for a circuit breaker with good structure, state management, and metrics. However, the core circuit breaker logic class is completely missing (config.py is truncated and no main CircuitBreaker implementation or decorator/context manager is provided). Async support is mentioned in requirements but absent from code. Exponential backoff and half-open behavior are referenced in diagrams but not implemented in the provided files." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 6.8, "brief_justification": "Solid implementation covering most requirements but incomplete (truncated acontext method, missing CircuitBreakerError definition, flawed state transition logic in _record_success and _is_callable, incorrect exponential backoff formula, and non-thread-safe sync methods). Good structure, metrics, and async support overall." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 6.05, "brief_justification": "The implementation is well-structured and clear with good use of patterns, but it's incomplete (code cuts off mid-try/except), has a bug in metrics (current_state referenced before assignment), and lacks the full async support and usage example promised in the introduction." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7, "brief_justification": "Solid implementation of core circuit breaker states and async support with good clarity and example. However, lacks true exponential backoff (fixed recovery_timeout only), thread-safety for metrics/state in concurrent scenarios, half-open success/failure logic is simplistic, and no sliding window or reset timeout on success in closed state." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 5.85, "brief_justification": "The code is incomplete (cuts off mid-constructor), missing key methods like call, state transitions, metrics, and the decorator. It shows good structure and some advanced features but fails to deliver a working, production-ready implementation as requested." }, { "judge_key": "grok_420", "judge_name": "Grok 4.20", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 6.2, "brief_justification": "Implementation has several bugs (e.g. missing await on transitions, half_open_max_calls unused, _can_execute not async-safe, decorator issues) and incomplete example code. Core concepts are present but not fully production-ready. Code is mostly clear and well-structured." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 9, "brief_justification": "Comprehensive and well-structured implementation with all requested features." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 8.8, "brief_justification": "Comprehensive implementation with all requested features, well-structured and documented." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 8.4, "brief_justification": "Accurate and detailed with good practical application." }, { "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 implementation with clear architecture, though missing final usage example." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 9, "brief_justification": "Comprehensive implementation with all requested features, excellent structure, and clear documentation." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.6, "brief_justification": "Comprehensive and accurate implementation with clear usage example and production-ready features." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 7.8, "brief_justification": "Clear and accurate with good depth." }, { "judge_key": "deepseek_v4", "judge_name": "DeepSeek V4", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 8.8, "brief_justification": "Comprehensive and well-structured implementation with all requested features." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 3.6, "brief_justification": "" }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 4.15, "brief_justification": "The snippet shows well-structured definitions and metrics, but lacks the core CircuitBreaker implementation and usage example, making it incomplete and of limited practical utility despite clear presentation." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 2, "brief_justification": "Response is incomplete, lacking full implementation and usage example, making it hard to assess correctness and usefulness; only minimal description provided." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 3.4, "brief_justification": "The answer provides partial code snippets that are clear but stops abruptly, missing core circuit breaker logic, async handling, exponential backoff, and usage example, making it largely incomplete and of limited practical use." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 6.8, "brief_justification": "Implements core circuit breaker features with async support and metrics, but contains bugs (e.g., sync decorator handling) and an incomplete usage example, limiting full correctness and practical usefulness." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 6.2, "brief_justification": "The implementation covers states, thresholds, exponential backoff, async handling and metrics, but has missing parts (undefined CircuitBreakerError, incomplete async context manager) and lacks the requested usage example, reducing overall correctness and completeness." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7.55, "brief_justification": "Implementation is clear and functional, covering states, async, and metrics, but lacks exponential backoff and some advanced production considerations." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 4.65, "brief_justification": "The response outlines a plausible async circuit breaker with states, backoff, and metrics, but the code is incomplete and lacks a usage example, limiting its correctness and practical usefulness." }, { "judge_key": "gpt_oss_120b", "judge_name": "GPT-OSS-120B", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 6.55, "brief_justification": "The answer provides a fairly detailed async circuit breaker with states, backoff, and metrics, but contains implementation bugs (e.g., async transitions called without await) and an incomplete usage example, reducing overall correctness and practical usefulness." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.15, "brief_justification": "The implementation is high quality, logically sound, and follows the requirements well. However, the code block is cut off at the end (incomplete `_after_call_failure` and missing the usage example), which impacts completeness and immediate usability." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 7.25, "brief_justification": "The implementation is high quality and follows production patterns (sliding windows, thread safety, snapshots). However, the response is incomplete; it cuts off mid-import in the config.py file and never provides the core logic (the actual CircuitBreaker class) or the requested async support and HTTP client example." }, { "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 implementation is robust, providing a production-ready async circuit breaker with exponential backoff, state management, and metrics. It includes a clear usage example with httpx. The code is well-structured and handles the requested features effectively." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8.55, "brief_justification": "The implementation is robust, covering all requested features including exponential backoff, async support, and metrics. It loses a point in correctness because the async context manager 'acontext' is truncated/incomplete at the very end of the response, and the use of a global lock inside the call method might cause performance bottlenecks in high-concurrency production environments." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 7.85, "brief_justification": "The implementation is high quality, well-structured, and covers the requested features like exponential backoff and metrics. However, the code is cut off mid-sentence in the 'call' method, making it incomplete and non-functional as provided." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 6.3, "brief_justification": "The response is incomplete as the code implementation is cut off mid-initialization. While the provided portion is logically sound and well-structured, it fails to provide the actual logic for state transitions, the decorator, or the requested HTTP client example." }, { "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 implementation is robust, thread-safe for async environments, and includes all requested features like exponential backoff and metrics. The usage example with aiohttp is practical and well-explained." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 7.35, "brief_justification": "Well-structured implementation with comprehensive features and clear explanations. However, the code is truncated - the _after_call_failure method is incomplete, making the implementation non-runnable. The HTTP client example is practical but the core implementation cannot be used as-is." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "claude_opus_46", "respondent_name": "Claude Opus 4.6", "weighted_score": 6.05, "brief_justification": "Well-structured implementation with comprehensive metrics and configuration options, but response is severely incomplete - cuts off mid-file missing the main CircuitBreaker class, async support, and HTTP client usage example. Cannot be used as provided." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "claude_sonnet_46", "respondent_name": "Claude Sonnet 4.6", "weighted_score": 6.8, "brief_justification": "Well-structured implementation with proper async support, thread-safe metrics, and good depth. However, response is incomplete - cuts off mid-file (config.py incomplete), missing main circuit breaker class, and no usage example with HTTP client as requested." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 8.15, "brief_justification": "Comprehensive implementation with all required features (three states, configurable thresholds, exponential backoff, async support, metrics). Well-structured code with proper locking and detailed tracking. Minor issues: truncated response (missing closing parenthesis in usage example), unused reset_timeout parameter, and decorator sync_wrapper doesn't properly handle async functions. Overall production-ready with minor improvements needed." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 5.85, "brief_justification": "Core circuit breaker logic is mostly correct but has bugs (incomplete acontext method, questionable lock initialization). Missing the explicitly requested HTTP client usage example. Half-open state implementation is incomplete - should limit test requests. Exponential backoff logic has issues with unbounded growth." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 6.3, "brief_justification": "Well-structured implementation with correct circuit breaker logic, but response is truncated mid-code - the try block is never closed, async method missing, and HTTP client usage example not included. Cannot run as provided." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 6.8, "brief_justification": "Good async implementation with clear state machine, but missing exponential backoff (explicitly requested) and thread-safety for concurrent scenarios. Basic metrics collection but lacks sliding window failure counting." }, { "judge_key": "minimax_m25", "judge_name": "MiniMax M2.5", "respondent_key": "mimo_v2_flash", "respondent_name": "MiMo-V2-Flash", "weighted_score": 7.15, "brief_justification": "Good implementation with async support, metrics, and exponential backoff. However, has critical bugs: _can_execute() is not async but calls async _transition_to_half_open(), and half-open logic doesn't properly track successful calls before closing. Also, failure count resets on success which breaks backoff calculation." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gpt_5_4", "respondent_name": "GPT-5.4", "weighted_score": 8.6, "brief_justification": "Comprehensive implementation with all requested features, clear structure, and practical example. Minor deduction for incomplete code snippet." }, { "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 implementation covering all requested features with clear structure and practical examples." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gemini_31_pro", "respondent_name": "Gemini 3.1 Pro", "weighted_score": 4.45, "brief_justification": "Response is incomplete, only provides a code stub without full implementation, missing key features like state transitions, metrics, and usage example." }, { "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": "Implementation covers core concepts but is incomplete (config.py cut off, missing main breaker class and async support)." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "grok_420", "respondent_name": "Grok 4.20", "weighted_score": 8.15, "brief_justification": "Accurate implementation with good async support and metrics, but incomplete HTTP client example and minor logical issues in state transitions." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "deepseek_v4", "respondent_name": "DeepSeek V4", "weighted_score": 8, "brief_justification": "Implementation covers all requested features with good structure and async support, but has minor issues like incomplete async context manager and potential race conditions." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "gpt_oss_120b", "respondent_name": "GPT-OSS-120B", "weighted_score": 7, "brief_justification": "Implementation is well-structured and covers key features, but response is incomplete (cut off mid-code) and lacks full async example and metrics collection details." }, { "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 implementation with all required states, async support, and metrics. Good structure and practical example, but missing explicit exponential backoff and more detailed metrics." }, { "judge_key": "mimo_v2_flash", "judge_name": "MiMo-V2-Flash", "respondent_key": "minimax_m25", "respondent_name": "MiniMax M2.5", "weighted_score": 7.65, "brief_justification": "Implementation is well-structured and covers key features, but incomplete as it cuts off mid-class definition and lacks full usage example." } ], "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)" } }