Calendarby GlyphTech · Releases
Claude Opus 5.5 launched, first model in the Claude 5.5 family
Tue, September 22, 2026
2 mo ago
Anthropic launched Claude Opus 5.5, the first model in the Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
Every year
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Claude Opus 5.5 launched, first model in the Claude 5.5 familyanthropicAn event.2 mo agoanthropic
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Source, method and history
- Source
- anthropic
- How we know
- From the Releases API (releases.fru.dev), which reads each vendor's changelog.
- Who
- anthropic
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- one-off
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- Changes
- 2026-09-25: added to 2026-09-22