Anthropic releases Claude Opus 5.5
Claude Opus 5.5 released — company-reported scores: Terminal-Bench 4.0 66.4% (Opus 5: 52.3%), FrontierCode v1.1 54.4% (48.0%), GDPval-AA v2.1 1846 Elo (1708), and OSWorld 2.0 partial-credit score 81.8% (74.0%). Pricing per 1M tokens is $4 input, $20 output and $0.20 for cache reads, lower than Opus 5 ($5/$25/$0.50), and Anthropic claims 40% lower operating costs and more than 30% faster output than Opus 5. Available as claude-opus-5-5 on AWS, Google Cloud and Azure. Improvements in prompt-injection resistance and in safety on automated behavioral audits were also presented
Why it matters
An update within the same generation that raised performance while also cutting unit prices. With the improvements concentrated in agentic coding, computer use and injection resistance, it shows frontier competition moving from "a smarter model" to "a model that sustains long-running loops cheaply and safely". All benchmark figures are company claims, with no independent reproduction
Source — Primary sources first; secondary reports are labelled “Press”
Officialanthropic.comhttps://www.anthropic.com/claude-opus-5-5Added in Week 40, 2026 · See that week