Claude Sonnet 3.7
Summary
Claude Sonnet 3.7 is a proprietary language model from Anthropic, released on 19 Feb 2025. It accepts text, images and PDFs and generates text, with a 200K-token context window and up to 64K output tokens per response.
Balanced Claude model for coding, analysis, agent workflows, and cost control
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Anthropic |
|---|---|
| Release date | 19 Feb 2025 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 200K (200,000 tokens) [models.dev] |
| Max output | 64K tokens [models.dev] |
| Knowledge cutoff | 31 Oct 2024 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
Claude Sonnet 3.7 API pricing by provider
USD per million tokens. Sorted by input price.
We do not currently track a paid API listing for this model.
Frequently asked questions
What is the context window of Claude Sonnet 3.7?
Claude Sonnet 3.7 has a context window of 200,000 tokens (200K) and can generate up to 64,000 tokens in a single response, according to models.dev.
Is Claude Sonnet 3.7 open source?
No. Claude Sonnet 3.7 is a proprietary model; Anthropic has not released its weights.
When was Claude Sonnet 3.7 released?
Anthropic released Claude Sonnet 3.7 on 19 Feb 2025, according to models.dev.
Change history
No changes detected since we started tracking this model. We re-check every source daily.