Introducing Claude Opus 5

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Anthropic has released Claude Opus 5, positioning it as close to the frontier intelligence of Claude Fable 5 at half the price. On coding benchmarks, the results are striking: Opus 5 sets a new state-of-the-art on Frontier-Bench v0.1 and more than doubles Opus 4.8's performance on the same benchmark at a lower cost per task. On CursorBench 3.2, it reaches within 0.5% of Fable 5's peak score at half the cost. Beyond coding, the model's performance on ARC-AGI 3 — a benchmark for novel problem-solving — is three times higher than the next-best model. On Zapier AutomationBench, which tests business task completion end-to-end, its pass rate is approximately 1.5x the next-best at the same cost per task. On OSWorld 2.0 (computer use), Opus 5 surpasses Fable 5's best result at just over one-third the cost. In life sciences, Opus 5 outperforms Opus 4.8 on every internal benchmark: organic chemistry gains are +10.2 percentage points and protein function prediction improves +7.7 percentage points. It becomes the new default on Claude Max and the strongest model on Claude Pro, with an effort setting that lets users optimize for speed or intelligence.