Introducing GPT-5.3-Codex

OpenAI introduced GPT-5.3-Codex, a Codex-native agent that combines frontier coding performance with general reasoning for long-horizon, real-world technical work.

From the source
GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.
openai.com

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Announced: 05 Feb 2026 00:00 UTC
Detected: 03 Aug 2026 21:11 UTC (+179d after)

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