gpt-5.1-codex Blog

What are GPT-5.1-Codex-Max and How to Use it ?

What are GPT-5.1-Codex-Max and How to Use it ?

On November 19–20, 2025 OpenAI released two related but distinct upgrades: GPT-5.1-Codex-Max, a new agentic coding model for Codex that emphasizes

GPT-5.1-Codex API

GPT-5.1-Codex API

gpt-5.1-codex is a specialized member of OpenAI’s GPT-5.1 family, optimized for agentic, long-running software-engineering workflows (code generation, patching, large refactors, structured code review and multi-step agentic tasks).