Anthropic releases Claude Opus 4.5
Claude Opus 4.5 released — $5/$25 per 1M tokens (Opus 4 and 4.1: $15/$75), with a new effort parameter in the API
Why it matters
Company-reported: at medium effort it matches Sonnet 4.5’s best SWE-bench Verified score while using 76% fewer output tokens
Source — Primary sources first; secondary reports are labelled “Press”
Officialanthropic.comhttps://www.anthropic.com/news/claude-opus-4-5Added in Week 41, 2026 · See that week