Claude Opus 5

Claude Opus 5 is Anthropic's July 2026 Opus release, and the pricing is the story: $5 per million input tokens and $25 per million output, identical to Claude Opus 4.8 and exactly half of Claude Fable 5 at $10/$50. The API id is claude-opus-5. It ships a 1 million token context window as both the default and the maximum, up to 128K output tokens, and text plus vision input. Anthropic's launch table puts it ahead of Fable 5 on most published rows despite the lower price: 70.6 percent on OSWorld 2.0 computer use against Fable 5's 66.1, 90.8 percent on BrowseComp against 87.4, 64.7 percent on Humanity's Last Exam with tools against 63.9, a GDPval-AA v2 knowledge-work score of 1861 against 1747, and 30.2 percent on ARC-AGI-3, a benchmark where Opus 4.8 scored 1.5. Fable 5 still edges it on FrontierCode (53.5 to 53.4) and DeepSWE (69.7 to 68.8), and Anthropic continues to position Fable 5 as the highest-capability tier. Treat every one of these as vendor-reported until independent runs land. Three operational changes matter for anyone porting from 4.8: adaptive thinking is now on by default when the thinking parameter is omitted, disabling thinking is only accepted at effort high or below (pairing it with xhigh or max returns a 400), and the minimum cacheable prompt drops to 512 tokens from 1024, so prompts previously too short to cache now create entries with no code change. Opus 5 draws on its own rate-limit bucket rather than the shared Opus 4.x pool, and Priority Tier does not cover it. Available on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. Claude Opus 5.5 succeeded it on September 22, 2026 at a lower $4/$20; Opus 5 is not deprecated, with retirement no sooner than July 24, 2027.