Claude Opus 5 is now available in the model picker. Use it for agentic coding, professional knowledge work, long-horizon reasoning, and vision work across supported files and images.
A 1-million-token context window. Claude Opus 5 can keep more conversation, file, and tool context in view for large codebases, long documents, and sustained multi-step work.
Fast mode for quicker replies. Select Claude Opus 5, then turn on Fast mode with the lightning control near the composer. Fast mode uses a lower-latency response path while Claude Opus 5 stays your selected model.
Plan for higher usage in Fast mode. Fast mode responds faster but uses more of your API usage budget. Turn it off to use the standard response path.
Move new Opus work forward. Claude Opus 4.8 remains available as Sunsetting during the transition. Choose Claude Opus 5 for new Opus chats.