SIRumors
ReleasedSep 22, 2026 ·

Claude Opus 5.5 is out

Anthropic shipped Claude Opus 5.5.

Anthropic

Anthropic released Claude Opus 5.5 on Sep 22, 2026. The company announced it itself (Claude on X).

It follows Claude Opus 5, 60 days earlier. Releases in the Claude Opus line usually land about 60 days apart.

Based on that pace, the next Claude Opus release is expected around Nov 21, 2026. That is our estimate, not a leak.

“Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.”
Claude on X
Released
Sep 22, 2026
Line
Claude Opus
Previous
Claude Opus 5 (Jul 24, 2026)
Confirmed by
The company's own announcement

Source: Claude on X

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