# Claude 3.5 Sonnet

> Claude 3.5 Sonnet is a proprietary language model from Anthropic, released on 9 Sept 2025. It accepts text and images and generates text, with a 200K-token context window and up to 8K output tokens per response.

Source page: https://www.aimodel.directory/models/claude-3-5-sonnet
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Anthropic
- **Release date:** 9 Sept 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Context window:** 200K (200,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Max output:** 8K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Knowledge cutoff:** 30 Apr 2024 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)
- **Structured output:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/qiniu-ai/models/claude-3.5-sonnet.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|

## FAQ

### What is the context window of Claude 3.5 Sonnet?

Claude 3.5 Sonnet has a context window of 200,000 tokens (200K) and can generate up to 8,200 tokens in a single response, according to models.dev.

### Is Claude 3.5 Sonnet open source?

No. Claude 3.5 Sonnet is a proprietary model; Anthropic has not released its weights.

### When was Claude 3.5 Sonnet released?

Anthropic released Claude 3.5 Sonnet on 9 Sept 2025, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Claude 3.5 Sonnet", https://www.aimodel.directory/models/claude-3-5-sonnet