Simon Willison • 12/19/2025

Introducing GPT-5.2-Codex

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OpenAI introduces GPT-5.2-Codex, the latest model in its Codex family, specifically optimized for agentic coding tasks. It features enhancements in long-horizon work via context compaction, better performance on large code changes like refactors, improved Windows environment support, and significantly stronger cybersecurity capabilities. The model is currently available in Codex coding agents, with an API release planned, and includes a new invite-only preview for cybersecurity professionals.

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#ai coding #cybersecurity #Openai
Introducing GPT-5.2-Codex

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