GPT-5.2 Codex

GPT-5.2 Codex is an upgraded version of GPT-5.1 Codex optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks. The model supports building projects from scratch, feature development, debugging, large-scale refactoring, and code review. Compared to GPT-5.1 Codex, 5.2 Codex is more steerable, adheres closely to developer instructions, and produces cleaner, higher-quality code outputs. Codex integrates into developer environments including the CLI, IDE extensions, GitHub, and cloud tasks. It adapts reasoning effort dynamically, providing fast responses for small tasks while sustaining extended multi-hour runs for large projects.