Anthropic Prices Claude Opus 5.5 at $4 and $20 per Million Tokens, Below Its Own Prior Flagship

Anthropic's Claude Opus 5.5 is priced at $4 per million input tokens and $20 per million output tokens, down from $5 and $25 for Opus 5, with cache-read costs cut by 60 percent. The company says the model matches Claude Fable 5.1's performance on most work at 40 percent lower running cost than Opus 5, and produces output more than 30 percent faster, as reported by The Decoder.

The capability claims are Anthropic's own. The company reports leads on agentic coding, computer use and knowledge work on its internal evaluation suite, and VentureBeat's coverage frames the API price as 60 percent below Fable 5.1 on key agentic tests. Neither the 40 percent running-cost figure nor the agentic performance claims have been reproduced by an independent evaluator yet, and the two cost percentages describe different comparisons: one against Opus 5, the other against Fable 5.1.

Two engineering details matter alongside the pricing. Anthropic says Opus 5.5 is less likely to take hard-to-reverse actions and more resistant to prompt injection than Opus 5, which matters more to agent operators than headline benchmark scores. The model is available directly through Anthropic and on Amazon Web Services, Google Cloud and Microsoft Azure, so switching costs are low for teams already using one of those clouds.