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Anthropic: Claude Sonnet 4.5 Release Date

Claude Sonnet 4.5 was released on 2025-09-29, which was 400 days ago. Its recency score is 81.

Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC

Release date
2025-09-29
Recency score
81

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Frequently asked questions

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released on 2025-09-29, which was 400 days ago. Its recency score is 81.