Sonnet 4.5 Final Deprecation Wave: Microsoft Copilot Studio Auto-Migrates to 4.6 by May 30

r/ClaudeAI·low signal

Claude Sonnet 4.5 is completing its multi-month sunset. After removal from the Claude web/desktop apps in March and API deprecation extension to May 18, the final wave is underway: Microsoft Copilot Studio auto-migrates all Sonnet 4.5 integrations to 4.6 by May 30. Reddit users are now reporting Sonnet 4.5 disappearing from remaining interfaces. The migration is a one-line model string swap with no API structure changes.