Claude Opus 5.5: API price, context window and how to connect
Claude Opus 5.5 by Anthropic: $4 per million input tokens, $20 per million output tokens, a 1M-token window. What it is good for, what to compare it with and how to connect it in SKILLOK.
In this article
In short#
Anthropic's flagship, successor to Claude Opus 5: for hard reasoning, code and long agentic work. Especially strong at multi-step changes in large codebases.
Specifications#
| Provider | Anthropic |
| Released | 2026-09-22 |
| Context window | 1M tokens |
| Accepts | text, images, files |
| Answers with | text |
| Reasoning mode | yes |
| Tool calling | yes |
| Open weights | no |
| Identifier | anthropic/claude-opus-5.5 |
Price#
| Per 1M tokens | In dollars |
|---|---|
| Input (question, context) | $4 |
| Output (answer) | $20 |
For reference: a conversation of 20 questions of ~500 tokens and answers of ~800 tokens costs about $0.36. Models in reasoning mode spend more tokens on an answer than the text shows: the reasoning is paid for too.
What it is good for#
- Large code changes and review
- Long agentic tasks
- Complex document analysis
Similar models#
Catalog models with the same kind of output, closest in the price of a typical request.
| Model | Input | Output | Window | Price |
|---|---|---|---|---|
| Claude Opus 5 | $5 | $25 | 1M | 1.2× more expensive |
| Qwen3.8 Max Prime | $4 | $12 | 1M | 1.4× cheaper |
| GPT-6.1 Sol | $2 | $10 | 1.05M | 2× cheaper |
| GPT-6.1 Sol Pro | $2 | $10 | 1.05M | 2× cheaper |
| Claude Sonnet 5.5 | $2 | $10 | 1M | 2× cheaper |
Other Anthropic models#
How to connect in SKILLOK#
Claude Opus 5.5 works through OpenRouter: add an OpenRouter key in Settings → AI and pick the anthropic/claude-opus-5.5 model. It then becomes available in Space AI, in tasks and to the repository agent. In detail — Connecting a model in SKILLOK.
Where the data comes from#
Prices, the context window and capabilities come from the public OpenRouter catalog as of 2026-10-19. A provider may change the price — the exact figure is always on the model's OpenRouter page.
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