GPT-5.2-Codex

GPT-5.2-Codex is OpenAI's coding-specialized model from the GPT-5.2 generation with a 400k token context window.

Strengths

The model excels at code generation, debugging, and understanding large codebases within its extended context window.

Best for

Writing, reviewing, and refactoring code across multi-file projects and complex technical documentation.

Limitations

It is optimized for code-specific tasks and does not offer the broad reasoning capabilities of the general-purpose GPT-5.2 or reasoning-focused GPT-5.2 Pro models from its generation.