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GPT-5.1-Codex-Max Blog

What are GPT-5.1-Codex-Max and How to Use it ?
Mar 27, 2026
gpt-5.1-codex
GPT-5.1-Codex-Max

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

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