Anthropic: Claude Sonnet 4.5 Knowledge Cutoff (2025-01-31)
Claude Sonnet 4.5's knowledge cutoff is 2025-01-31, which was 641 days ago. Its freshness score is 70 out of 100.
Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC
Knowledge cutoff
2025-01-31
Freshness score
70
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Frequently asked questions
When is the knowledge cutoff for Anthropic: Claude Sonnet 4.5?
Claude Sonnet 4.5's knowledge cutoff is 2025-01-31, which was 641 days ago. Its freshness score is 70 out of 100.
What can Claude Sonnet 4.5 know after its knowledge cutoff?
Claude Sonnet 4.5 stopped learning from its training data on 2025-01-31. It cannot know about world events, news, or new technologies that happened after that date.