WhichAI.todayAnthropic
Claude Opus 5.5: release date and what's new
- Released
- Status
- Available now
- Type
- Update
The first Claude 5.5 model performs at Fable 5.1 level on most work and costs 40% less to run than Opus 5.
What's new
- Agentic coding
- Knowledge work
- Lower cost
Official announcement: anthropic.com ↗
Where Claude Opus 5.5 ranks today
Full Claude Opus 5.5 profile →
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Questions
When was Claude Opus 5.5 released?
Anthropic released Claude Opus 5.5 on Sep 22, 2026.
Is Claude Opus 5.5 available now?
Yes. Claude Opus 5.5 has been available since Sep 22, 2026.
What's new in Claude Opus 5.5?
The first Claude 5.5 model performs at Fable 5.1 level on most work and costs 40% less to run than Opus 5.
Where does Claude Opus 5.5 rank?
Claude Opus 5.5 is today's #1 pick for coding & software, alternative pick for writing & marketing, based on public leaderboards checked daily.