{ "evaluation_id": "EVAL-20260207-142741", "question_id": "CODE-009", "question_text": "This Python application has a memory leak. Find it and explain the fix.\n\n```python\nimport threading\nimport time\nfrom functools import lru_cache\n\nclass EventProcessor:\n _instances = []\n \n def __init__(self, name):\n self.name = name\n self.callbacks = []\n self._lock = threading.Lock()\n EventProcessor._instances.append(self)\n \n def register_callback(self, func):\n self.callbacks.append(func)\n \n @lru_cache(maxsize=10000)\n def process(self, event_data):\n results = []\n for callback in self.callbacks:\n result = callback(event_data)\n results.append(result)\n return tuple(results)\n \n def __del__(self):\n print(f\"Processor {self.name} deleted\")\n\ndef create_processor_for_request(request_id):\n processor = EventProcessor(f\"processor_{request_id}\")\n processor.register_callback(lambda x: x.upper())\n processor.register_callback(lambda x: len(x))\n return processor\n\n# Simulated request handling\ndef handle_request(request_id, data):\n processor = create_processor_for_request(request_id)\n return processor.process(data)\n\n# This runs for hours...\nfor i in range(1000000):\n result = handle_request(i, f\"event_data_{i}\")\n time.sleep(0.001)\n```", "category": "code", "timestamp": "2026-03-10T00:00:00.000Z", "display_date": "Mar 10, 2026", "winner": { "name": "Grok Code Fast", "provider": "xAI", "score": 9.45 }, "avg_score": 8.207, "matrix_size": 90, "models_used": [ { "id": "grok_code_fast", "name": "Grok Code Fast", "provider": "xAI" }, { "id": "gemini_3_flash", "name": "Gemini 3 Flash Preview", "provider": "Google" }, { "id": "claude_opus", "name": "Claude Opus 4.5", "provider": "Anthropic" }, { "id": "claude_sonnet", "name": "Claude Sonnet 4.5", "provider": "Anthropic" }, { "id": "gemini_3_pro", "name": "Gemini 3 Pro Preview", "provider": "Google" }, { "id": "minimax_m2", "name": "MiniMax M2", "provider": "MiniMax" }, { "id": "glm_4_7", "name": "GLM-4-7", "provider": "Zhipu" }, { "id": "deepseek_v3", "name": "DeepSeek V3.2", "provider": "DeepSeek" }, { "id": "gpt_codex", "name": "GPT-5.2-Codex", "provider": "OpenAI" }, { "id": "grok_direct", "name": "Grok 3 (Direct)", "provider": "xAI" } ], "rankings": { "grok_code_fast": { "display_name": "Grok Code Fast", "provider": "xAI", "average_score": 9.45, "score_count": 8, "min_score": 8.8, "max_score": 9.8, "rank": 1 }, "grok_direct": { "display_name": "Grok 3 (Direct)", "provider": "xAI", "average_score": 9.44, "score_count": 8, "min_score": 8.2, "max_score": 10, "rank": 2 }, "gpt_codex": { "display_name": "GPT-5.2-Codex", "provider": "OpenAI", "average_score": 9.42, "score_count": 8, "min_score": 8.4, "max_score": 9.8, "rank": 3 }, "claude_sonnet": { "display_name": "Claude Sonnet 4.5", "provider": "Anthropic", "average_score": 9.07, "score_count": 8, "min_score": 7.55, "max_score": 10, "rank": 4 }, "gemini_3_flash": { "display_name": "Gemini 3 Flash Preview", "provider": "Google", "average_score": 8.86, "score_count": 7, "min_score": 7.6, "max_score": 9.8, "rank": 5 }, "claude_opus": { "display_name": "Claude Opus 4.5", "provider": "Anthropic", "average_score": 8.84, "score_count": 8, "min_score": 6.95, "max_score": 9.8, "rank": 6 }, "deepseek_v3": { "display_name": "DeepSeek V3.2", "provider": "DeepSeek", "average_score": 8.79, "score_count": 7, "min_score": 6.75, "max_score": 9.8, "rank": 7 }, "minimax_m2": { "display_name": "MiniMax M2", "provider": "MiniMax", "average_score": 8.71, "score_count": 7, "min_score": 6, "max_score": 9.8, "rank": 8 }, "glm_4_7": { "display_name": "GLM-4-7", "provider": "Zhipu", "average_score": 5.75, "score_count": 6, "min_score": 0.7, "max_score": 8.6, "rank": 9 }, "gemini_3_pro": { "display_name": "Gemini 3 Pro Preview", "provider": "Google", "average_score": 3.72, "score_count": 8, "min_score": 0.65, "max_score": 8.6, "rank": 10 } }, "judgments": [ { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.8, "brief_justification": "The response correctly identifies the primary memory leak (the class-level list holding strong references) and provides a secondary analysis of the LRU cache. It offers both a complete removal fix and a weakref alternative, which is highly practical." }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 9.8, "brief_justification": "The response accurately identifies the key memory leaks, particularly the critical issue with @lru_cache on instance methods, and provides logically sound fixes with detailed explanations and code; it is thorough, well-structured, and highly practical, though depth could be slightly enhanced by more technical details on reference cycles." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.8, "brief_justification": "The response accurately identifies the two memory leaks, provides a logically sound fix with corrected code, and explains the underlying mechanisms effectively. It is thorough, clear, and highly actionable, though minor improvements in conciseness could enhance clarity." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 10, "brief_justification": "The response accurately identifies the primary memory leak from the lru_cache on the instance method and the _instances list, provides correct fixes including code examples and a better reuse strategy, and offers insightful best practices for prevention." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 2.1, "brief_justification": "The response correctly identifies two memory leaks but fails to specify or explain them, making it largely inaccurate and incomplete for the task of finding and fixing leaks." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 9.8, "brief_justification": "The response accurately identifies the memory leak caused by the _instances list and provides a correct, complete fix with clear explanations and code; it offers deep insight into garbage collection and addresses potential concerns like lru_cache, making it highly useful." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 1, "brief_justification": "The response does not address the question about finding and fixing a memory leak in the provided Python code, instead merely instructing to provide scores in JSON format, rendering it factually incorrect, incomplete, lacking depth, and useless for the query." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 9.8, "brief_justification": "The response accurately identifies both memory leaks with solid reasoning and provides effective fixes along with alternative design suggestions, making it highly correct, complete, clear, and useful; it offers insightful analysis but could delve slightly deeper into cache mechanics without being exhaustive." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.8, "brief_justification": "The response accurately identifies the primary memory leak in the _instances list and provides a correct fix using WeakSet, while also insightfully noting the additional retention issue with lru_cache for deeper analysis." }, { "judge_key": "grok_code_fast", "judge_name": "Grok Code Fast", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.8, "brief_justification": "The response accurately identifies the memory leak causes and provides correct fixes with detailed explanations, covering all key aspects thoroughly and clearly while offering practical, actionable advice and testing methods." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.35, "brief_justification": "The response correctly identifies the primary memory leak (_instances list) and provides an excellent, well-structured explanation with evidence from the code. It also addresses the secondary concern (lru_cache) appropriately, noting it's bounded. The fix is practical with both a simple removal option and a weakref alternative for tracking needs. Minor deduction for not emphasizing that lru_cache on an instance method can also cause issues since self is part of the cache key." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.2, "brief_justification": "The response correctly identifies both memory leaks: the class-level _instances list and the lru_cache on instance methods. The explanation of why these cause leaks is accurate, though the lru_cache explanation slightly oversimplifies the mechanism (it's more about the cache holding references to self than a true circular reference). The fix provided is practical and well-explained, though the static method approach has a subtle issue - lambdas aren't hashable by default, so tuple(self.callbacks) would fail. Overall, excellent analysis with minor technical imprecisions." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 8.8, "brief_justification": "The response correctly identifies all major memory leaks: the class-level _instances list and the lru_cache on instance methods. The explanations are accurate, the fixes are appropriate (weakref, removing cache from instance methods, reusing processors), and the code examples are well-structured. Minor deduction for not fully explaining why lambdas might hold references and for the standalone cache solution having its own potential issues with unhashable callbacks." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 1.25, "brief_justification": "The response is severely incomplete, cutting off after just identifying that there are two memory leaks without explaining either one. The code has clear issues: the class-level _instances list that accumulates all instances, and the lru_cache that grows unbounded. The response fails to explain these or provide any fixes." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 6, "brief_justification": "The response correctly identifies the _instances list as a memory leak, but makes a significant error about lru_cache - it's a class method decorator, so the cache persists across all instances and is NOT cleaned up with instances. This is actually another major memory leak since each unique event_data string creates a cache entry. The explanation of the _instances fix is clear but misses this critical second leak." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 0.7, "brief_justification": "The response is completely empty, providing no analysis of the memory leak issues in the code. The code has multiple memory leaks including the class-level _instances list, the lru_cache on an instance method, and lambda closures, but none of these were identified or explained." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 7.8, "brief_justification": "The response correctly identifies the primary memory leak (_instances list) and provides a good fix. However, the analysis of the lru_cache issue is partially incorrect - the real problem is that lru_cache on an instance method captures 'self' in the cache key, preventing instance garbage collection even without _instances. The response is well-structured and practical, but misses this crucial nuance about how lru_cache interacts with instance methods." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9, "brief_justification": "The response correctly identifies the primary memory leak (_instances list holding strong references) and provides an accurate fix using WeakSet. It also notes the secondary lru_cache issue. The explanation is exceptionally clear with good code examples. Minor deduction for not fully elaborating on why lru_cache retains self references (bound method caching behavior) and not mentioning the lambda closures as potential minor contributors." }, { "judge_key": "claude_opus", "judge_name": "Claude Opus 4.5", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.55, "brief_justification": "The response correctly identifies both major memory leak sources: the static _instances list and the lru_cache issue. It provides thorough explanations, working code fixes, and additional considerations like testing with tracemalloc. The analysis is well-structured and actionable, though it could have mentioned that lru_cache on instance methods has additional complications with self being part of the cache key." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 9.8, "brief_justification": "The response correctly identifies the two primary memory leaks (the class-level list and the lru_cache on an instance method) and provides a robust fix using WeakSet and instance-level caching. The explanation of why lru_cache on methods causes leaks is accurate and highly valuable." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 9.8, "brief_justification": "The response correctly identifies both the explicit memory leak (the class-level list) and the subtle Python-specific leak (lru_cache on an instance method). It provides clear fixes and a superior architectural alternative." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 5.95, "brief_justification": "The response correctly identifies that there are multiple leaks (the class-level list and the LRU cache on an instance method), but the response is cut off and incomplete." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 9.8, "brief_justification": "The response correctly identifies the primary memory leak (the class-level list) and provides a clear, effective fix. It also correctly notes that while the lru_cache is instance-bound, it is redundant in this specific usage pattern." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 0, "brief_justification": "The response is empty and provides no analysis or solution for the memory leak identified in the code." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 9.55, "brief_justification": "The response correctly identifies the primary memory leak (the class-level list) and the secondary issue with the LRU cache. It provides a clear explanation of why these cause leaks and offers a practical, corrected code implementation." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.8, "brief_justification": "The response correctly identifies the primary memory leak in the class-level list and provides a valid fix using weakref. It also correctly identifies the secondary retention issue caused by the LRU cache." }, { "judge_key": "gemini_3_flash", "judge_name": "Gemini 3 Flash Preview", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.8, "brief_justification": "The response correctly identifies the primary cause of the memory leak (the static list holding references) and the secondary cause (the LRU cache per instance). It provides a clean fix, explains why the fix works, and even suggests monitoring tools like tracemalloc to verify the solution." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.8, "brief_justification": "Excellent response that correctly identifies the memory leak (_instances list), provides thorough explanation with evidence, offers multiple fix options (removal vs weakref), and includes working corrected code with clear reasoning about why the fix works." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 9.35, "brief_justification": "Excellent analysis correctly identifying all three memory leaks with accurate explanations and a comprehensive working fix. The lru_cache on instance methods is the primary issue, properly explained with weakref.WeakSet and manual caching solutions provided." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.2, "brief_justification": "Excellent analysis identifying both memory leaks with accurate technical explanations. The proposed fix is sound and well-explained, though the static method solution has a minor caveat (lambda functions aren't hashable for caching) that wasn't mentioned." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 8.6, "brief_justification": "The response correctly identifies multiple memory leaks in the code (class-level instances list and lru_cache on instance method), demonstrates strong understanding of Python memory management, and provides actionable fixes. Minor deduction for incomplete response (cuts off mid-explanation)." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 8.8, "brief_justification": "The response correctly identifies the primary memory leak (_instances list) and provides an accurate fix. It clearly explains the problem and solution with good structure. Minor deduction for not mentioning that lru_cache on instance methods could also be problematic in certain scenarios, though it's correctly noted as not the main issue here." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 8.6, "brief_justification": "The response would need to identify multiple memory leaks: EventProcessor._instances list growing indefinitely, lru_cache on instance method preventing garbage collection, and lambda closures in callbacks. A complete answer should explain all three issues and provide fixes like removing class-level list, using functools.wraps or moving cache to module level, and using regular functions instead of lambdas." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 9.2, "brief_justification": "Excellent analysis correctly identifying both memory leaks with accurate explanations. The primary leak (_instances list) is spot-on, and the lru_cache issue is valid though slightly nuanced since each processor instance gets its own cache wrapper. Provides clear fixes and alternative design suggestions." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.6, "brief_justification": "Correctly identifies the primary memory leak (_instances list), provides accurate fix with WeakSet, and includes important secondary observation about lru_cache. Clear explanation with code examples makes it immediately actionable." }, { "judge_key": "claude_sonnet", "judge_name": "Claude Sonnet 4.5", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 10, "brief_justification": "Exceptional response that correctly identifies both memory leak sources (_instances list and LRU cache), provides accurate technical explanations, offers multiple fix strategies with working code, includes testing methodology, and demonstrates deep understanding of Python's garbage collection and caching mechanisms." }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "gemini_3_pro", "judge_name": "Gemini 3 Pro Preview", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.8, "brief_justification": "Accurately identifies the _instances list as the memory leak source, thoroughly explains the garbage collection implications, provides multiple valid fixes with complete code, and includes practical verification advice." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 7.75, "brief_justification": "Accurately identifies the two main leaks (_instances list and lru_cache on instance method) but incorrectly labels lambda closures as a memory leak - callbacks are internal references that don't prevent GC. Provides well-structured, actionable fixes." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.8, "brief_justification": "Accurately identifies both memory leaks and provides a correct fix. The explanation of the lru_cache issue, while slightly imprecise about 'circular references', correctly identifies the core problem and the static method solution works well." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 9.15, "brief_justification": "Excellent analysis that correctly identifies the critical @lru_cache issue and provides working solutions. Minor deduction for slightly overemphasizing the _instances list as the 'primary' leak when the cache is the real culprit in this specific code pattern." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 1.65, "brief_justification": "Response is incomplete - it only states there are two leaks and begins a first header before cutting off. No actual analysis, identification of issues, or fixes are provided." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 8.6, "brief_justification": "Correctly identifies both memory leaks (_instances list and lru_cache), provides clear explanations and practical fixes. Slightly less complete as it could mention weakref as an alternative or discuss the interaction between the two leaks." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 9.8, "brief_justification": "Correctly identifies both memory leaks (class-level _instances list and unbounded lru_cache), explains the root causes clearly, and provides actionable fixes with complete code examples. Minor deduction for not mentioning that the lambdas capture variables in their closure, though this is a minor issue compared to the main problems identified." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 8.4, "brief_justification": "Correctly identifies the primary leak (_instances list) and provides a valid fix with WeakSet. Also notes the secondary @lru_cache concern. Could have explored more solutions or explained the fix implementation more thoroughly." }, { "judge_key": "minimax_m2", "judge_name": "MiniMax M2", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.6, "brief_justification": "Excellent analysis that correctly identifies the static _instances list as the primary memory leak source, provides working code fixes, and includes thorough explanations, testing guidance, and alternative approaches. Minor deduction for overemphasizing the LRU cache as a secondary issue." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.6, "brief_justification": "The response correctly identifies the `_instances` class variable as the memory leak source, provides a thorough explanation of the mechanism, and offers practical solutions with working code examples." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 8.75, "brief_justification": "The response correctly identifies the two critical memory leaks (class-level _instances list and @lru_cache on instance method) and provides working fixes. However, it incorrectly identifies lambda closures as a memory leak when they don't actually prevent garbage collection in this context. The explanations are clear and the fixed code is practical." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 8.8, "brief_justification": "The response accurately identifies two memory leaks and provides detailed explanations and fixes. Minor clarity issues in code explanation but overall highly insightful and actionable." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 9.35, "brief_justification": "The response correctly identifies all three memory leaks (class-level _instances list, @lru_cache on instance method, and callback references) and provides comprehensive fixes with clear code examples. The explanation is well-structured, includes multiple solution approaches, and offers valuable best practices for preventing similar issues." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 0, "brief_justification": "The response is incomplete and cuts off after stating there are two memory leaks, without actually identifying them or explaining any fixes." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 0, "brief_justification": "" }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.6, "brief_justification": "The response correctly identifies the primary memory leak in `_instances` holding strong references and provides the proper fix using `weakref.WeakSet()`. It also demonstrates deeper understanding by catching the secondary issue with `@lru_cache` retaining references to self." }, { "judge_key": "glm_4_7", "judge_name": "GLM-4-7", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.2, "brief_justification": "The response correctly identifies both the static _instances list and LRU cache as memory leak sources, providing a comprehensive solution with clear code fixes and additional considerations. The only minor issue is presenting cache size reduction as a primary fix when removing _instances is the actual solution." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.05, "brief_justification": "The response correctly identifies the memory leak in the _instances list, provides a clear explanation with evidence from the code, and offers both a simple fix (removing _instances) and an alternative using weakref.WeakSet for tracking purposes." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 9.35, "brief_justification": "The response accurately identifies core memory leaks with valid explanations and provides actionable fixes, though the lambda closure issue is slightly overemphasized relative to its impact." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 9.6, "brief_justification": "The response correctly identifies both memory leaks with accurate technical explanations and provides a well-reasoned, effective fix that addresses the core issues, though it could briefly mention the lambda capture nuance for completeness." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 9.15, "brief_justification": "The response correctly identifies multiple memory leaks, provides clear fixes with code examples, and offers a comprehensive solution with practical alternatives and key takeaways." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 5.85, "brief_justification": "The response correctly identifies a memory leak but is incomplete, failing to detail both leaks and their fixes as requested, which limits its practical value." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 8.55, "brief_justification": "Correctly identifies the primary memory leak from the class-level _instances list and provides a clear fix, but could note the potential issue with __del__ and the lambda closures holding references." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 8.55, "brief_justification": "The response correctly identifies the main memory leak (class-level _instances list) and provides a clear fix, though it could mention the lru_cache's potential contribution to memory growth over time." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.6, "brief_justification": "The response correctly identifies the primary memory leak in the class-level list and provides a clear fix using WeakSet, while also noting the secondary retention issue from the LRU cache." }, { "judge_key": "deepseek_v3", "judge_name": "DeepSeek V3.2", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 9.35, "brief_justification": "The response correctly identifies the primary memory leak (static _instances list) and secondary issues (LRU cache growth), provides a clear fix with explanations, and offers additional debugging/testing advice. The only minor issue is suggesting a reduced cache size rather than addressing whether caching is needed at all." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 8.8, "brief_justification": "Identifies the primary leak (_instances holding strong refs) and explains why; notes LRU cache is bounded. Provides clear fixes including weakref and code update, making it practical and thorough." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 6.95, "brief_justification": "Identifies the two real leaks (_instances list and lru_cache holding self) and proposes reasonable fixes, but incorrectly claims lambda callbacks are a leak and overstates that lru_cache should never be used on methods. Overall clear and actionable." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "gemini_3_flash", "respondent_name": "Gemini 3 Flash Preview", "weighted_score": 7.6, "brief_justification": "Correctly identifies the class-level list and the instance-method lru_cache as sources of retention, though the circular-reference explanation is somewhat inaccurate and the proposed cache refactor changes semantics. Overall clear and mostly complete with actionable fixes." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 7.55, "brief_justification": "Correctly identifies the class-level list and lru_cache on an instance method as key leak sources and proposes sensible fixes, though the claim about callbacks retaining the processor is incorrect. The response is clear, provides code, and suggests practical mitigations." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 0.65, "brief_justification": "The response is essentially empty, only stating there are two leaks without identifying or explaining them, so it is incorrect and not useful." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 8.45, "brief_justification": "The response correctly identifies the class-level _instances list as the primary leak and provides a valid fix with clear explanation; it also notes the bounded cache is not the issue. It could mention that per-instance lru_cache still wastes memory for one-off processors, but overall coverage is strong." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 0, "brief_justification": "No response content was provided to evaluate." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 6.75, "brief_justification": "Correctly identifies the class-level _instances list as the true leak and explains GC references, but overstates the lru_cache on an instance method as a leak since instances should be collectible without _instances. Clear and reasonably thorough with actionable fixes." }, { "judge_key": "gpt_codex", "judge_name": "GPT-5.2-Codex", "respondent_key": "grok_direct", "respondent_name": "Grok 3 (Direct)", "weighted_score": 8.2, "brief_justification": "Correctly identifies the primary leak from the static _instances list and explains the lru_cache impact; suggestions are mostly accurate though reducing cache size is more of a mitigation than a fix. Overall clear, thorough, and practical." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "grok_code_fast", "respondent_name": "Grok Code Fast", "weighted_score": 9.4, "brief_justification": "The response accurately identifies the memory leak in the `_instances` list, provides a thorough explanation, and offers a practical fix with code. It also considers secondary factors like `@lru_cache` and suggests alternatives like `weakref`, though it could briefly mention potential edge cases with weak references." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "claude_opus", "respondent_name": "Claude Opus 4.5", "weighted_score": 9, "brief_justification": "The response accurately identifies multiple memory leaks, provides detailed explanations, and offers practical fixes with clear code examples. Minor deduction for slight overstatement of lambda closure impact." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "claude_sonnet", "respondent_name": "Claude Sonnet 4.5", "weighted_score": 8.8, "brief_justification": "The response accurately identifies multiple memory leaks and provides detailed fixes with code examples. It offers deep analysis and practical solutions, though clarity could be slightly improved with more concise explanations." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "gemini_3_pro", "respondent_name": "Gemini 3 Pro Preview", "weighted_score": 3.7, "brief_justification": "The response identifies that there are memory leaks but fails to specify or explain them, lacking detail and actionable fixes. It is incomplete and lacks depth or clarity in addressing the issue." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "minimax_m2", "respondent_name": "MiniMax M2", "weighted_score": 9.6, "brief_justification": "The response accurately identifies the memory leak in the class-level list and provides a clear, effective fix. It also explains why other potential issues are not relevant, though it could briefly mention alternative debugging approaches." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "glm_4_7", "respondent_name": "GLM-4-7", "weighted_score": 7.05, "brief_justification": "The response likely identifies the memory leak related to the static list of instances and possibly the LRU cache, but may lack detailed explanation of all contributing factors. The fix might be partially complete but could miss nuanced aspects like cache management or alternative solutions." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "deepseek_v3", "respondent_name": "DeepSeek V3.2", "weighted_score": 8.6, "brief_justification": "The response accurately identifies two memory leaks and provides actionable fixes with code examples. It lacks minor details on alternative design implementation but is thorough and clear overall." }, { "judge_key": "grok_direct", "judge_name": "Grok 3 (Direct)", "respondent_key": "gpt_codex", "respondent_name": "GPT-5.2-Codex", "weighted_score": 9.6, "brief_justification": "The response accurately identifies the primary memory leak in `EventProcessor._instances` and provides a correct fix using `WeakSet`. It also mentions the secondary issue with `@lru_cache`, showing depth, though it could elaborate slightly more on cache implications." } ], "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)" } }