Anthropic · Claude · Dario Amodei · Mythos · TechCrunch AI
Anthropic ships Opus 5.5 with lower prices and Fable-level performance
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Anthropic’s newest model, Opus 5.5, was released on Tuesday, setting a new state-of-the-art in coding and knowledge work performance, according to the company.
Key facts
- Output tokens will be charged at $20 per million tokens for Opus 5.5, compared to $25 for the previous model
- The launch comes two months after the release of Opus 5 on July 24
- Opus 5.5’s safety training was broadly similar to its predecessors, with alignment testing and pre-release evaluation by outside organizations like METR and Frontier Design
- Opus 5.5 is Anthropic’s first model release since CEO Dario Amodei embraced calls to pace the frontier, deliberately slowing down progress on AI capabilities to match the rate of progress on alignment
Summary
The new model is also significantly cheaper than its predecessor. The new version also makes significant changes to how Opus communicates, with the Opus 5.5 less likely to use jargon and more likely to put important information at the start of its messages. The launch comes two months after the release of Opus 5 on July 24. Anthropic says that Opus 5.5 is comparable to Mythos in its biology and cybersecurity capabilities, so its release is subject to the same safeguards as the company’s Fable model.