Claude Opus 5.5
by Kilo Gateway · family claude-opus · listed Sep 2026RTV
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...
Current rates USD per 1M tokens
Input$4.00
Output$20.00
Cache read$0.20
Cache write$5.00
Against the market
On the record
- Model id
anthropic/claude-opus-5.5- Context window
- 1M tokens
- Max output
- 128K tokens
- Input modalities
- text, image, pdf
- Output modalities
- text
- Reasoning
- yes
- Tool calls
- yes
- Open weights
- no
- Knowledge cutoff
- Jun 2026
- Released
- 2026-09-22
- Last updated
- 2026-09-22
- Provider docs
- kilo.ai
Back of the envelope
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