Claude Sonnet 5.5
Claude Sonnet 5.5 is an Anthropic model released in September 2026 with a one-million-token context window, text and image input, and text output.
Overview
On the Claude Platform, Sonnet 5.5 supports a 1M-token context window and up to 128K output tokens. It is available through the Claude API and several cloud platforms.
Model specifications
- Family
- Claude 5.5
- Context
- 1,000,000 tokens
- Input
- Text, Image
- Output
- Text
- Open weights
- No
- Capabilities
- Reasoning, Vision, Tool Use
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