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GPT-5.1 Codex Max vs Kimi K2 Thinking
Comprehensive side-by-side LLM comparison
GPT-5.1 Codex Max leads with 4.7% higher average benchmark score. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.1 Codex Max, released by OpenAI in November 2025, is an enhanced coding variant from the GPT-5.1 Codex line, designed for more complex software engineering tasks requiring additional reasoning depth. It targets large-scale code generation, automated refactoring, and sophisticated agentic development workflows.
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Moonshot AI
Kimi K2 Thinking, released by Moonshot AI on November 6, 2025, is a reasoning-focused variant of Kimi K2 with 1 trillion total parameters and 32 billion active parameters, featuring extended chain-of-thought processing for complex problem solving. It builds on K2's agentic coding strengths with additional capabilities for mathematical and scientific reasoning. Kimi K2 Thinking targets open-source deployments requiring deep, deliberate reasoning across coding and analytical domains.
5 days newer
GPT-5.1 Codex Max
OpenAI
2025-11
Kimi K2 Thinking
Moonshot AI
2025-11-06
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5.1 Codex Max
Average Score:48.5%(+4.7%)
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Kimi K2 Thinking
Average Score:43.8%
Performance comparison across key benchmark categories
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GPT-5.1 Codex Max
Coding48.5%(+4.7%)
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Kimi K2 Thinking
Coding43.8%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Codex Max
0 providers
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Kimi K2 Thinking
1 providers
Moonshot AI
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GPT-5.1 Codex Max
Avg Score:48.5%(+4.7%)
Providers:0
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Kimi K2 Thinking
Avg Score:43.8%
Providers:1