Claude Opus 4 series
by Anthropic
Entry point for Anthropic’s Opus 4 generation. Version notes carry the detail; this page tracks the line.
Versions
| Version | Note | Notes |
|---|---|---|
| Opus 4 | [[./claude-opus-4 | claude-opus-4]] |
| Opus 4.1 | [[./claude-opus-4-dot-1 | claude-opus-4-dot-1]] |
| Opus 4.5 | [[./claude-opus-4-dot-5 | claude-opus-4-dot-5]] |
| Opus 4.6 | [[./claude-opus-4-dot-6 | claude-opus-4-dot-6]] |
| Opus 4.7 | [[./claude-opus-4-dot-7 | claude-opus-4-dot-7]] |
| Opus 4.8 | [[./claude-opus-4-dot-8 | claude-opus-4-dot-8]] |
Successors and siblings
- Claude Opus 5 — next generation
- Claude Fable 5 · Claude Mythos — parallel Anthropic lines
- Sonnet 4.5 / 4.6 · Haiku 4.5 — tier siblings
Pattern
Opus 4.x shipped six point releases across roughly 18 months. Through mid-2026 the line served
as the industry’s frontier reference — open-weight releases were routinely marketed as matching
or beating the current Opus at a fraction of the cost. By August 2026 that comparison had become
routine enough that price and local runnability, not capability, were the differentiators.