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