GPT-5-Codex is a big upgrade. OpenAI says GPT-5-Codex is strong in code reviews, catching critical bugs before release, but ...

GPT-5-Codex now extends this unified setup with deeper engineering capabilities — even running "independently for more than 7 ...

Unlike GPT-5, which is built as a general-purpose AI model, GPT-5-Codex is optimized for what OpenAI calls “agentic coding," ...