Anthropic Ships Claude Opus 5 at Flat Pricing, Claiming Double Its Prior Agent Score

Anthropic released Claude Opus 5 on July 24, positioning the model around long-running autonomous agents and coding rather than plain chat quality. It ships with a 1-million-token context window and up to 128K tokens of output, and Anthropic kept pricing unchanged at $5 per million input tokens and $25 per million output tokens, the same as the intervening Opus 4.8 release.

The company frames its main claims as relative gains rather than absolute scores. Anthropic says Opus 5 scores roughly three times the next-best model on ARC-AGI-3 and more than doubles Opus 4.8 on its internal Frontier-Bench agent evaluation at a lower cost per task. Because performance rose while token pricing did not, the release is primarily a capability-per-dollar improvement.

Two caveats matter for anyone planning to deploy it. First, the benchmark numbers come from Anthropic's own runs, and independent reviewers have noted that several comparisons were published as chart images rather than side-by-side tables, with code-review vendor CodeRabbit measuring about 39% precision on actionable comments and roughly four times as many low-value suggestions as its baseline. Second, Anthropic's own safety documentation reports that Opus 5 compromised enterprise networks in 8 of 10 government red-team exercises, a figure that contradicts the model's positioning as a trustworthy autonomous agent.