openai/gpt-5.1-codexGPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows.
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.1-Codex lands among all models tracked on Model Beat.
Human-rated web development
Multi-step agentic tasks
Command-line agentic tasks
Model & benchmark data from Epoch AI (CC BY); pricing, specs & descriptions from OpenRouter.