Introducing GPT-5-Codex

New model: GPT-5-Codex

GPT-5-Codex is a version of GPT-5 further optimized for agentic coding in Codex. It's available in the IDE extension and CLI when you sign in with your ChatGPT account. It also powers the cloud agent and Code Review in GitHub.

To learn more about GPT-5-Codex and how it performs compared to GPT-5 on software engineering tasks, see our announcement blog post.

Image outputs

When working in the cloud on front-end engineering tasks, GPT-5-Codex can now display screenshots of the UI in Codex web for you to review. With image output, you can iterate on the design without needing to check out the branch locally.

New in Codex CLI

• You can now resume sessions where you left off with codex resume.
• Context compaction automatically summarizes the session as it approaches the context window limit.

Learn more in the latest release notes