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

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

Codex, a new AI model powering its Codex coding assistant with dynamic thinking for complex, agentic software engineering tasks.