What's wrong with this entry?
Anonymous. No account, no email.
What
Users whose model setting references claude-sonnet-4-5-20250929 (or its [1m] extended-thinking variant) are automatically migrated to sonnet (or sonnet[1m]). A notification "Model updated to Sonnet 4.6" is shown briefly after the migration.
Details
- Applies only to first-party (claude.ai-authenticated) users on Pro, Max, or Team plans
- Extended thinking mode (
[1m]) is preserved during migration - Users who have already started at least one session will see the notification; brand-new users will not
Evidence
Sonnet 4.5 to 4.6 migration (search for "tengu_sonnet45_to_46_migration" and "Model updated to Sonnet 4.6")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.