OpenAI is rolling out the GPT-5 Codex model to all Codex instances, including Terminal, IDE extension, and Codex Web (codex.chatgpt.com).

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.