openai/gpt-5.1-codex-maxGPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks.
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.1-Codex-Max lands among all models tracked on Model Beat.
Autonomous task length
Command-line agentic tasks
Model & benchmark data from Epoch AI (CC BY); pricing, specs & descriptions from OpenRouter.