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Devstral-2-123B vs GPT-5.1 Codex
Comprehensive side-by-side LLM comparison
GPT-5.1 Codex leads with 5.4% higher average benchmark score. Overall, GPT-5.1 Codex is the stronger choice for coding tasks.
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Mistral AI
Devstral 2, released by Mistral AI on December 9, 2025, is a 123 billion parameter dense transformer model specifically designed for software engineering tasks. It features a 256K token context window and achieved 72.2% on SWE-bench Verified at release, making it a competitive open-weight option for automated coding and agentic development. Devstral 2 targets code generation, multi-file software engineering, and agentic development workflows under a modified MIT license.
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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.
1 month newer
GPT-5.1 Codex
OpenAI
2025-11
Devstral-2-123B
Mistral AI
2025-12-09
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Devstral-2-123B
Average Score:37.5%
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GPT-5.1 Codex
Average Score:42.9%(+5.4%)
Performance comparison across key benchmark categories
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Devstral-2-123B
Coding37.5%
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GPT-5.1 Codex
Coding42.9%(+5.4%)
Provider Availability & Performance
Available providers and their performance metrics
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Devstral-2-123B
1 providers
OpenRouter
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GPT-5.1 Codex
0 providers
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Devstral-2-123B
Avg Score:37.5%
Providers:1
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GPT-5.1 Codex
Avg Score:42.9%(+5.4%)
Providers:0