Change stream · Claude Platform release notes
Per-message effort changes are in beta on Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5 on the Claude API.
1 Sep 2026 · Anthropic Claude
No access to your tenant or devices. Every item links to its source. What this means
Change stream · Claude Platform release notes
1 Sep 2026 · Anthropic Claude