Claude Platform Release NotesLaunchClaude Watch
Claude platform release notes: September 30, 2026
This is the operational reality behind the model layer consolidation. A three-month deprecation window is faster than you'd expect. For Claude builders, start the migration this week if you're still on 4.5, because "after November" will turn into a production outage. For investors, this cadence shows Anthropic is confident enough in new models to retire the old ones quickly. The risk window is shrinking.