Claude Opus 5, released July 24, 2026, brought Anthropic's Claude 5 generation to the Opus tier six weeks after Claude Fable 5 opened it — at half Fable's price, keeping Opus 4.8's $5 per million input tokens and $25 per million output. The pitch was flagship-class agentic capability at workhorse pricing: at launch it scored 43.3% on Frontier-Bench v0.1, more than double Opus 4.8's 21.1% and nearly ten points clear of Fable 5, and posted a GDPval-AA v2 Elo of 1861 for knowledge work, the best published score at the time.

The launch card leaned on breadth: 90.8% on BrowseComp for agentic search, 70.6% on OSWorld 2.0 computer use, 64.7% on Humanity's Last Exam with tools, and 30.2% on ARC-AGI-3 — which Anthropic reported as roughly three times the next best published result on the novel problem-solving benchmark. Anthropic made it the default model on Claude Max and the strongest model available on Claude Pro, positioning Opus 5 as the everyday frontier model while Fable 5 kept the edge on a handful of evaluations, including DeepSWE agentic coding and Harvey's held-out legal benchmark.