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Claude Sonnet 4.5 Timeline - Announcements & Release History | AI Stats
Claude Sonnet 4.5
Anthropic
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Model Timeline
17 Feb 2026
Claude Sonnet 4.6
Future version
29 Sept 2025
Model Released
Model first made available to the public
29 Sept 2025
Model Announced
Model first introduced to the public
21 May 2025
Claude Sonnet 4
Previous version
