From the source

Building more with GPT-5.1-Codex-Max

New model

OpenAI announced GPT-5.1-Codex-Max, a new coding model for Codex with improved speed, intelligence, reasoning, and token efficiency.

From the source
Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex.
openai.com

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