# Claude Opus 5.5: AI model fact sheet

- **Provider:** anthropic
- **Released:** 2026-09-22
- **Context window:** 1,000,000 tokens
- **API pricing:** $4.00 / 1M input, $20.00 / 1M output
- **OpenRouter ID:** anthropic/claude-opus-5.5
- **Capabilities:** conversation, reasoning, analysis, code-generation, tool-use

Anthropic's successor to Opus 5 for reasoning, coding, and extended agent workflows. Accepts text, images, and documents in a one-million-token context, with adaptive thinking controlled by reasoning effort.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/claude-opus-5.5