Anthropic releases Opus 5.5 with lower prices and Fable-level performance

Anthropic’s newest model, Opus 5.5, was released on Tuesday, setting a new state-of-the-art in coding and knowledge work performance. Notably, the release outpaces the larger Fable model in many benchmarks, and succeeded in a number of informal tasks that Fable failed to complete.

In the announcement, Anthropic called it “the strongest-performing model we’ve tested to date.”

Opus 5.5 is also significantly cheaper than Opus 5. Output tokens will be charged at $20 per mTok, compared to $25 for the previous model, and other metrics have similar price drops. The model is also faster to run, reflecting an overall drop in the compute requirements.

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.