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OpenAI released a new ChatGPT coding model, GPT-5.3-codex, on Feb. 5. The company says it helped build and deploy itself.

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 has released GPT-5.2-Codex via its API, a frontier-class model optimized for complex, long-running agentic coding tasks. Read more...