OpenAI Launches GPT-5.1-Codex-Max: Enhanced Agentic Coding Model for Project-Scale Development
By
hansonw
If you only eat one bagel today, this is the bagel.
Summary
OpenAI introduces GPT-5.1-Codex-Max, a new agentic coding model designed for long-running, project-scale development work. The model is built on an updated foundational reasoning system trained across software engineering, math, and research tasks. Key improvements include faster performance, enhanced intelligence, and better token efficiency throughout the development cycle, positioning it as a reliable coding partner capable of operating across multiple context windows.
Key quotes
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GPT‑5.1‑Codex‑Max is faster, more intelligent, and more token-efficient at every stage of the development cycle–and a new step towards becoming a reliable coding partner.
GPT‑5.1‑Codex‑Max is built for long-running, detailed work. It’s our first model natively trained to operate across multiple context windows through a process ca
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