Model family timeline
Last updated May 28, 2026
Claude Opus model releases
A source-backed timeline for the Claude Opus model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
2
Models
1
Labs
0
Open
2
Recent
Most recent in this set
2 models
Claude Opus 4.8
AvailableAnthropicFrontierProprietary
Anthropic's most capable model, with strengthened agentic and long-running task performance.
Type
—
Params
Undisc.
Context
500K
Top eval
—
Released
May 28, 2026
23d ago
—Undisc.500K ctxMay 28, 2026
Claude Opus 4.6
AvailableAnthropicFrontierProprietary
Introduced genuinely autonomous multi-file coding and stronger computer use.
Type
—
Params
Undisc.
Context
200K
Top eval
—
Released
Feb 5, 2026
5mo ago
—Undisc.200K ctxFeb 5, 2026