AI HISTORY

Claude Opus 5.5 Release

Anthropic introduced Claude Opus 5.5 on September 22, 2026.

22 September 2026AI HISTORYVERIFIED

Historical classification

This verified record belongs to LINEAiGE's artificial-intelligence history layer beginning in 1956.

Why it matters

A dated Anthropic model-release milestone for the Claude 5.5 family.

People, organizations & technologies

ORGANIZATIONS
Anthropic

TECHNOLOGIES
Claude Opus 5.5

Evidence & verification

STATE
verified

CONFIDENCE
high

LAST VERIFIED
2026-10-06T10:01:00+08:00

Anthropic's first-party Claude Opus page explicitly dates the introduction to September 22, 2026. Anthropic's model system-card index independently lists Claude Opus 5.5 as a September 2026 model. No development geography, ancestry, influence, causality, priority, downstream impact, or relationship edge is inferred.

Sources

SOURCE 1 · PRIMARY · CLAIM-EVIDENCE

Claude Opus

Anthropic

PUBLISHED
2026-09-22

OPEN SOURCE

SOURCE 2 · PRIMARY · CORROBORATION

Model system cards

Anthropic

OPEN SOURCE

Trace the chronology

← Grok 4.7 Release Gemini 3.8 Flash TTS General Availability →

Record identity

LINEAiGE ID
claude-opus-5-5-release-2026