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GPT-5.3-Codex

Model
OpenAIPart of Codexactive

Agentic coding model improving project-scale software engineering and cybersecurity work.

Released
Feb 5, 2026
Context window
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Modality
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Open source
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API available
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Releases
1

Releases

1
Feb 5, 2026GPT-5.3-Codex releasedGPT-5.3-Codex

OpenAI released GPT-5.3-Codex, an interactive agentic coding model for complex software and professional work.