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.
3
Models
1
Labs
0
Open
3
Recent
3 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
1mo 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
Claude Opus 4.1
AvailableAnthropicFrontierProprietary
Anthropic's August 2025 Opus point release, focused on stronger coding, reasoning, and agentic reliability over Claude Opus 4. Proprietary API model with text, vision, and code capabilities.
Type
—
Params
Undisc.
Context
200K
Top eval
—
Released
Aug 5, 2025
11mo ago
—Undisc.200K ctxAug 5, 2025