Anthropic: Claude Opus 5.5 Release Date
Claude Opus 5.5 was released on 2026-09-21, which was 43 days ago. Its recency score is 98.
Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC
Release date
2026-09-21
Recency score
98
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Frequently asked questions
When was Claude Opus 5.5 released?
Claude Opus 5.5 was released on 2026-09-21, which was 43 days ago. Its recency score is 98.