{
  "evaluation_id": "EVAL-20260317-015707",
  "question_id": "EVAL-20260317-015707",
  "question_text": "Write a function to reverse a string",
  "category": "code",
  "timestamp": "2026-03-17T01:57:07.418Z",
  "display_date": "Mar 17, 2026",
  "winner": {
    "name": "Qwen 3.5 35B-A3B",
    "provider": "openrouter",
    "score": 9.87
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  "avg_score": 9.6775,
  "matrix_size": 43,
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      "name": "Qwen 3.5 9B",
      "provider": "openrouter"
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      "name": "Qwen 3 32B",
      "provider": "openrouter"
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      "provider": "openrouter"
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  ],
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      "display_name": "Qwen 3.5 122B-A10B",
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      "score_count": 6,
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      "rank": 6
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      "display_name": "Qwen 3.5 9B",
      "provider": "openrouter",
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    "qwen3_coder_next": {
      "display_name": "Qwen 3 Coder Next",
      "provider": "openrouter",
      "average_score": 9.2,
      "score_count": 4,
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  },
  "judgments": [
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 10,
      "brief_justification": "The response provides accurate, comprehensive, and well-structured solutions with clear explanations, performance analysis, and practical examples for reversing a string in Python."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 10,
      "brief_justification": "The response provides a correct, complete, and clear solution with thorough explanation, practical examples, and insightful discussion of efficiency and edge cases."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9,
      "brief_justification": "The response provides accurate code examples in multiple languages with correct syntax and functionality. It covers major languages and includes usage examples, though lacks explanation of manual implementation details."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, comprehensive, and well-structured code examples across multiple languages with clear explanations and practical recommendations."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, well-structured code examples in multiple languages, covers edge cases, and includes complexity analysis. It lacks deeper trade-off analysis between methods but remains highly practical and informative."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 10,
      "brief_justification": "The response provides multiple correct methods for reversing strings in Python and other languages, includes test cases, complexity analysis, and practical examples, covering all aspects of the task thoroughly."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, well-structured code examples across multiple languages and methods, with clear explanations and practical recommendations. It covers various approaches and their trade-offs, though could expand slightly on edge cases."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 10,
      "brief_justification": "The response provides multiple correct methods to reverse a string in Python with clear explanations, performance analysis, and practical recommendations. It covers different approaches with their pros and cons, making it highly informative and actionable."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly implements string reversal using Python slicing, explains the syntax, provides alternative methods, and includes examples. It thoroughly addresses the question with clear, structured code and analysis of efficiency."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.4,
      "brief_justification": "The response provides accurate, well-documented implementations in multiple languages with clear examples. It covers common approaches and acknowledges alternative methods without overcomplicating the solution."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides multiple correct implementations for reversing a string in various languages with clear explanations, time/space complexity analysis, and practical recommendations. It is comprehensive, well-structured, and highly useful for understanding different approaches."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response provides multiple accurate implementations across languages, clear explanations, complexity analysis, and practical examples, making it comprehensive and actionable for developers."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 8.8,
      "brief_justification": "The response provides multiple correct Python implementations for string reversal, test cases, complexity analysis, and examples in other languages. It's well-structured and comprehensive, though could offer more detailed comparison of the different approaches."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 10,
      "brief_justification": "The response provides accurate, well-structured code examples in multiple languages with clear explanations, complexity analysis, and practical recommendations. It thoroughly addresses the question with both implementation details and strategic guidance."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides multiple correct, working implementations with accurate complexity analysis and practical recommendations; the two-pointer implementation has a minor logical flaw (appending both s[right] and s[left] in each iteration causes duplication), but the final code still produces correct output due to compensating behavior—hence a slight deduction in depth."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.8,
      "brief_justification": "The response is factually accurate, covers multiple approaches with clear explanations and examples, and emphasizes best practices—only slightly lacking in deeper performance analysis (e.g., time/space complexity) or edge-case considerations beyond empty strings."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.8,
      "brief_justification": "The response is factually accurate, comprehensive, and clearly explains the slicing method with examples and edge cases. It includes helpful documentation and handles Unicode correctly. Depth is slightly below perfect only because it doesn't briefly mention alternative approaches (e.g., `reversed()` or loops), which could enhance comparative insight."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides multiple correct, well-explained implementations across several languages, includes complexity analysis and practical recommendations, with only minor room for improvement in depth (e.g., edge cases like Unicode/emoji handling could be briefly mentioned)."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 9.8,
      "brief_justification": "The response is factually accurate, covers multiple Python and language-specific implementations, includes complexity analysis and practical recommendations. Depth is slightly below perfect only because it doesn’t discuss edge cases like Unicode/surrogate pairs or in-place reversal limitations in Python strings (though this is arguably beyond scope)."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides multiple correct Python implementations with clear explanations, test cases, complexity analysis, and cross-language examples. It accurately covers time/space complexity and includes practical usage. Depth is slightly below perfect only because it doesn’t discuss edge cases like Unicode/surrogate pairs or in-place reversal (impossible for immutable strings), but this is minor for the scope."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, language-specific implementations with correct time/space complexity analysis and clear examples. It covers multiple approaches (slicing, loops, recursion, built-ins) and includes a helpful comparison table and recommendation section, though it could slightly deepen discussion on edge cases (e.g., Unicode, null/empty strings)."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 8.5,
      "brief_justification": "The response is highly structured and comprehensive, offering multiple valid approaches with complexity analysis. However, the 'Manual Two-Pointer Approach' contains a logical error that produces incorrect output, reducing overall factual accuracy."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 9.55,
      "brief_justification": "The response is factually accurate and well-structured, providing multiple robust implementations and clear examples. However, the manual iteration complexity is technically O(n^2) due to string immutability, slightly impacting the accuracy of the analysis section."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9.3,
      "brief_justification": "The code implementations are correct and the response is exceptionally clear and comprehensive, but the complexity analysis inaccurately claims all Python methods are O(n) when loop concatenation and recursion slicing are O(n^2)."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response delivers accurate, working code across four major languages with excellent structure and practical recommendations. While highly useful, it could achieve greater depth by noting the O(n^2) complexity of loop methods in languages with immutable strings."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, working code with multiple approaches, clear formatting, and valuable performance analysis that exceeds the basic prompt requirements."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.4,
      "brief_justification": "The response provides accurate, working code with multiple approaches and clear explanations. It covers the main solution thoroughly with alternatives, examples, and best practices, making it highly practical for developers."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, idiomatic Python code with clear explanations and examples covering edge cases like Unicode and empty strings. It thoroughly addresses the prompt within the context of Python programming."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.2,
      "brief_justification": "The code snippets are syntactically correct and cover multiple popular languages with clear examples. However, it relies on built-in methods without addressing edge cases or algorithmic complexity."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "All code examples are syntactically and logically correct with accurate complexity analysis. The response comprehensively covers multiple approaches across several languages with clear organization, practical recommendations, and edge case considerations."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9.8,
      "brief_justification": "The response is factually accurate with syntactically correct code across multiple languages. It excels in structure and provides extensive value through test cases, complexity analysis, and multiple implementation patterns."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "All code examples are accurate and functional across multiple languages with correct complexity analysis. The response exceeds the basic requirement by providing multiple approaches, comparisons, and recommendations, though it could briefly mention edge cases like null/empty strings or Unicode handling."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.8,
      "brief_justification": "The response delivers a factually correct and optimal Python solution with clear examples covering edge cases and Unicode. Its structured presentation and explanation of the slicing mechanism make it highly actionable and easy to understand."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.2,
      "brief_justification": "The code is syntactically correct and idiomatic across four major languages with clear usage examples. While it omits complexity analysis and edge case handling, it directly and effectively fulfills the user's request."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 10,
      "brief_justification": "The response is factually accurate and provides multiple correct implementations across several languages. It exceeds the basic request by offering complexity analysis, examples, and practical recommendations."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response is factually accurate and provides comprehensive solutions across multiple languages with complexity analysis. It exceeds expectations by including edge case examples and clear best practice recommendations."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.55,
      "brief_justification": "The response is comprehensive and well-structured, offering multiple languages and approaches. However, the time complexity analysis for string concatenation loops in immutable languages like Java is technically O(n^2) rather than O(n)."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 9.15,
      "brief_justification": "The primary recommended solution is correct and optimal, but the included two-pointer implementation contains a logical error that produces incorrect output."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides accurate, efficient code with clear explanations and alternative methods for deeper understanding. It is well-structured, covers edge cases, and is immediately actionable."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.8,
      "brief_justification": "The response provides a factually correct Python solution with excellent structure, covering edge cases and Unicode handling. It explains the underlying mechanism clearly, making it highly actionable for users."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 10,
      "brief_justification": "The response provides accurate, working code across multiple languages with detailed complexity analysis and clear recommendations. It exceeds expectations by offering various algorithmic approaches and educational context."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response provides accurate, working code across multiple languages with clear examples, complexity analysis, and best practice recommendations. It thoroughly addresses the prompt with exceptional structure and insight."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 10,
      "brief_justification": "The response provides accurate, multiple Python implementations along with cross-language examples, test cases, and complexity analysis. It is well-structured, easy to understand, and offers actionable recommendations."
    }
  ],
  "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)"
  }
}