OpenAI’s new GPT‑5.1-Codex-Max — all about the agentic coding model that can work for long hours

OpenAI this week rolled out GPT-5.1-Codex-Max, a new agentic coding model, built for long-running and detailed software development tasks.

Described as “faster, more intelligent, and more token-efficient at every stage of the development cycle,” the new model is available across all Codex surfaces.

This launch comes shortly after Google unveiled Antigravity, its agentic, developer-focused AI platform, setting the stage for a head-to-head battle between the two biggest players in AI for the future of software development.

What is…