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Anthropic

Is Claude Opus 5.5 out? Yes, since September 22, 2026

Yes. Claude Opus 5.5 was released on September 22, 2026.

A browser notification for each confirmed release in this family. No account or email.

Have you used it? Claude Opus 5.5

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Lab
Anthropic
Family
Claude
Release date
Source
Anthropic · Claude Opus 5.5

What changed

  • context 1M tokens · Context window of Claude Opus 5.5. Claude Fable 5.1 is the previous model of the same tier, but the gap is beyond what a percentage explains.
  • price -60 % · Prompt price compared with Claude Fable 5.1, same tier in this family. Went from $10.00 / MTok to $4.00 / MTok. Lower is better.

About Claude Opus 5.5

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

Next Claude model to watch

Questions

When was Claude Opus 5.5 released?
Claude Opus 5.5 was released on September 22, 2026.
Who makes Claude Opus 5.5?
Claude Opus 5.5 is made by Anthropic.
What comes after Claude Opus 5.5?
Claude Sonnet 5.5, released on September 28, 2026.