AI model · Anthropic
Claude Opus 5.5
Model ID: anthropic/claude-opus-5.5
- Input
- $4 per 1M tokens
- Output
- $20 per 1M tokens
- Context
- 1M tokens at once
- Max output
- 128K tokens per reply
- Released
- 22 Sep 2026 Anthropic
What it can do
- YesReasoning
- YesTool calling
- YesImage input
- NoOpen weights
- NoFree to use
Takes text, image, file; gives text.
How its listing describes it
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...
Sources
- Anthropic: Claude Opus 5.5 on OpenRouter — read 2 Oct 2026