Claude Opus 5 matches Fable 5 performance at half the token price

Anthropic's release of Claude Opus 5 represents a direct response to competitive and pricing pressure in the large language model market. The body notes that Anthropic is specifically responding to pricing pressure from GPT-5.6 Sol and Chinese competitors, and designed Opus 5 to close the price-performance gap with Fable 5, which commands a significantly higher cost per token. By pricing Opus 5 at exactly half the input and output token rates of Fable 5 while delivering equal or superior performance on multiple benchmarks, Anthropic is repositioning its product lineup to offer better value without sacrificing capability.

However, the article emphasizes that raw token rates mask a more complex cost story. Token efficiency—the actual number of tokens consumed to complete a task—varies substantially across models and effort levels. The body notes that Opus 4.7 ended up costing 30 to 40 percent more per task than Opus 4.6 despite identical base rates, and a similar pattern appeared with Claude Sonnet 5. This means users cannot assume that Opus 5's lower per-token price automatically translates to lower per-task cost. The five effort levels (low, medium, high, xhigh, max) allow users to make explicit performance-versus-efficiency trade-offs; Anthropic reports that Opus 5 achieves better value at every effort level compared to its predecessor, and recommends users start with low or medium for general work and xhigh for specialized coding tasks.

Opus 5's benchmark performance tells a nuanced story: it leads decisively on coding and novel problem-solving (the ARC-AGI-3 result of 30.2%—nearly 4× higher than GPT-5.6 Sol—is flagged by the body as a notable outlier with unclear real-world implications), and surpasses Fable 5 on knowledge work. However, the article makes clear that Opus 5 does not win everywhere—Fable 5 and Mythos 5 retain advantages in health and legal domains, and GPT-5.6 Sol leads on the DeepSWE v1.1 coding benchmark. The release also includes technical improvements: Opus 5 can now build its own tools to solve problems (the body describes it writing a computer vision pipeline when direct image viewing was blocked), and its safety classifiers trigger roughly 85 percent less often than Fable 5's, a response to Fable 5's heavy criticism for excessive interventions.