Anthropic unveils Claude Opus 5.5
- On Tuesday, September 22, 2026, Anthropic released Claude Opus 5.5, the first model in its new 5.5 family, delivering frontier performance at significantly lower costs than Claude Opus 5.
- CEO Dario Amodei called on companies to "pace the frontier," and Opus 5.5 is the first model released since that call. It performs at levels comparable to Claude Fable 5.1 while generating output more than 30% faster than the previous Opus version.
- Opus 5.5 completed a 680,000-line code migration in less than a day, work previously requiring weeks of engineering effort. The model also succeeded in 39 of 40 software load-time optimization tests.
- Developers can access the model via API for $4 per million input tokens and $20 per million output tokens. Anthropic is also increasing five-hour usage limits for Pro, Max, and Team subscribers.
- In the coming weeks, Anthropic plans to release Claude Sonnet 5.5 and Claude Haiku 5.5 with similar performance improvements. The company deployed external evaluators including METR and Frontier Design to test safeguards before release.
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Anthropic's cheaper Opus arrives weeks before its IPO
Anthropic released Claude Opus 5.5 on Tuesday at $4 per million input tokens and $20 per million output, below the $5 and $25 that Opus 5 has carried since July, and says it performs similarly to the more expensive Fable 5.1 on most work. It is the first model since Dario Amodei called for third-party […] This story continues at The Next Web
Less expensive, faster and launched despite the call to moderation of his own boss Dario Amodei, Anthropic reveals Claude Opus 5.5 while facing the pressures of the UN and the competition. ...
Anthropic Unveils More Cost-Efficient Opus 5.5 Model Before IPO
Anthropic PBC is releasing a new artificial intelligence model that’s meant to field a wide range of business tasks at a lower cost, part of the startup’s bid to keep ahead of rivals while it prepares for a highly anticipated Wall Street debut.
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