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Written by AI from the official notes. Check them for exact details.Opus 4.6 is now the default model for Max and Team subscribers, with new effort settings.
- Opus 4.6 defaults to medium effort for Max and Team subscribers.
- 'Ultrathink' keyword reintroduced for high effort in next turn.
- Opus 4 and 4.1 removed from first-party API, users migrated to Opus 4.6.
Why it matters: Max and Team subscribers should note the new default settings for improved task performance.
Full release notes3 changes
What's changed
- Opus 4.6 now defaults to medium effort for Max and Team subscribers. Medium effort works well for most tasks — it's the sweet spot between speed and thoroughness. You can change this anytime with
/model - Re-introduced the "ultrathink" keyword to enable high effort for the next turn
- Removed Opus 4 and 4.1 from Claude Code on the first-party API — users with these models pinned are automatically moved to Opus 4.6