Anthropic's Claude Opus 5 delivers near Fable 5 intelligence at half the cost

Anthropic has launched Claude Opus 5, its latest high-end model designed primarily for developers and enterprise knowledge work. The company claims it comes close to the capabilities of Claude Fable 5 in many domains—at half the price. Early adopters report substantial improvements: Stripe software engineer Cristian Rivera gave Opus 5 a chief-of-staff role over dev environments, noting it built its own monitors and drove each box with minimal human intervention. Harvey, a legal AI platform, saw the biggest gains in corporate governance and arbitration, with head of research Niko Grupen stating that Opus 5 achieves similar quality while generating 26% fewer tokens on average compared to Opus 4.8 at max reasoning.

Cursor co-founder Sualeh Asif confirmed that Opus 5 delivers near Fable 5 intelligence at Opus speed and cost, with many of the same behaviors. Anthropic expects Opus 5 to become the daily driver, especially in enterprise settings. The model also offers greater autonomy with less back-and-forth, better error recovery, and more frequent self-checks. For users on the $100/month Claude Max plan, early testing indicates ample usage runway—one user reached only 31% of their weekly limit after extensive agentic runs. Opus 5 also overperforms on biology tasks compared to Opus 4.8, extending its utility to scientific research.