GPT-5-Codex Launch: Adaptive Reasoning, SWE-bench, Review

September 15, 2025

OpenAI released GPT-5-Codex across terminal, IDE, GitHub, and ChatGPT, saying it beat GPT-5 on SWE-bench and code review, with thinking time reaching about seven hours.

OpenAI

Sources

TechCrunch

News · Sep 15, 2025

OpenAI upgrades Codex with a new version of GPT-5

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