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GPT-5.3 Codex

A Codex-tuned model for code review, edits, implementation details, and developer workflows.

CodeReviewImplementationRefactorDeveloper

For turning technical intent into code changes

Best for

Code edits
Review notes
Test design

Model traits

Developer framing
Diff-aware
Implementation detail

Use boundaries

General writing
Visual brainstorming
Live facts
Chat History