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Claude Sonnet 4 Timeline - Announcements & Release History | AI Stats

Claude Sonnet 4

Claude Sonnet 4

Claude Sonnet 4

Anthropic

Overview Timeline Benchmarks Providers Quickstart Performance

Model Timeline

29 Sept 2025

Claude Sonnet 4.5

Future version

21 May 2025

Model Released

Model first made available to the public

21 May 2025

Model Announced

Model first introduced to the public

24 Feb 2025

Claude 3.7 Sonnet

Previous version