Anthropic releases Claude Opus 4 and Claude Sonnet 4
Claude Opus 4 and Sonnet 4 released — hybrid models with near-instant and extended-thinking modes; Claude Code made generally available the same day
Why it matters
Company-reported: SWE-bench Verified 72.5% for Opus 4 and 72.7% for Sonnet 4, Terminal-bench 43.2% for Opus 4. Priced like the previous generation ($15/$75 and $3/$15 per 1M tokens), with measures for higher AI Safety Levels such as ASL-3
Source — Primary sources first; secondary reports are labelled “Press”
Officialanthropic.comhttps://www.anthropic.com/news/claude-4Added in Week 41, 2026 · See that week