Anthropic releases Claude Opus 4.5
AIMade by AIWritten by AI (Claude) from the source below. Check anything important against the source.How it's made
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
On the map — ⑥ Reasoning Models line
- Previous stopClaude Haiku 4.5
- This record · stopClaude Opus 4.5
- Next stopClaude Sonnet 4.6
In the model family tree — Claude family · 20 versions
- Earlier versionClaude Haiku 4.5
- This recordClaude Opus 4.5
- Later versionClaude Opus 4.6