Claude Opus 5.5 — reviews, specs & pricing

Anthropic's first Claude 5.5 model, released 22 September 2026 for long-running agentic coding and knowledge work. 1M-token context, 128k max output, adaptive thinking always on, and about 40% cheaper to run than Opus 5 at $4/$20 per million tokens.

Summary

Leading Anthropic model for long-horizon agentic coding at $4/$20 per million tokens.

Specifications

  • Provider: anthropic
  • License: closed
  • Context: 1000k tokens
  • Input price: $4/M tok
  • Output price: $20/M tok
  • Released: 2026-09-22

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is Claude Opus 5.5?

Leading Anthropic model for long-horizon agentic coding at $4/$20 per million tokens.

How much does Claude Opus 5.5 cost?

Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens.

Is Claude Opus 5.5 open source?

Claude Opus 5.5 is released under the closed license.