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GPT-5.1 Codex vs Kimi K2.5
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.1 Codex, released by OpenAI in November 2025, is a coding-specialized model from the GPT-5.1 family engineered for software engineering tasks including code generation, multi-file editing, and agentic development. It targets developers and automated coding pipelines requiring a GPT-5.1-generation model tuned for programming.
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Moonshot AI
Kimi K2.5, released by Moonshot AI in January 2026, is an updated Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters. It builds on Kimi K2 with improved coding performance across multiple languages and an expanded context window. Kimi K2.5 targets agentic development workflows, polyglot code generation, and open-source deployments requiring large-scale MoE reasoning.
2 months newer
GPT-5.1 Codex
OpenAI
2025-11
Kimi K2.5
Moonshot AI
2026-01
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT-5.1 Codex
Average Score:58.3%(+0.9%)
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Kimi K2.5
Average Score:57.4%
Performance comparison across key benchmark categories
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GPT-5.1 Codex
Coding58.3%(+0.9%)
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Kimi K2.5
Coding57.4%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Codex
0 providers
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Kimi K2.5
1 providers
Moonshot AI
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GPT-5.1 Codex
Avg Score:58.3%(+0.9%)
Providers:0
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Kimi K2.5
Avg Score:57.4%
Providers:1