Anthropic: Claude Opus 4.5 Knowledge Cutoff (2025-05-31)
Claude Opus 4.5's knowledge cutoff is 2025-05-31, which was 521 days ago. Its freshness score is 76 out of 100.
Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC
Knowledge cutoff
2025-05-31
Freshness score
76
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Frequently asked questions
When is the knowledge cutoff for Anthropic: Claude Opus 4.5?
Claude Opus 4.5's knowledge cutoff is 2025-05-31, which was 521 days ago. Its freshness score is 76 out of 100.
What can Claude Opus 4.5 know after its knowledge cutoff?
Claude Opus 4.5 stopped learning from its training data on 2025-05-31. It cannot know about world events, news, or new technologies that happened after that date.