# Claude 3.7 Sonnet

> Anthropic's first hybrid reasoning model, with toggleable extended thinking.

- Maker: Anthropic
- Line: Claude Sonnet
- Canonical page: https://ai-tldr.dev/models/claude-3-7-sonnet/
- Updated: 2026-08-20

## In short

Claude 3.7 Sonnet is Anthropic's first hybrid reasoning model, with toggleable extended thinking. Anthropic released it on 24 February 2025 as an API-only model. It has a 200K-token context window and costs $3.00 per million input tokens and $15.00 per million output tokens. You can use it through Anthropic and Amazon Bedrock.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 200K (max output 128K) | [1] |
| Input price | $3.00 per million tokens | [2] |
| Output price | $15.00 per million tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 24 February 2025 | [3] |
| Knowledge cutoff | November 2024 | [1] |

## Sources

1. [Anthropic model deprecations (retirement dates)](https://platform.claude.com/docs/en/about-claude/model-deprecations)
2. [Claude 3.7 Sonnet and Claude Code](https://www.anthropic.com/news/claude-3-7-sonnet)
3. [Claude 3.7 Sonnet on Amazon Bedrock (AWS)](https://aws.amazon.com/blogs/aws/anthropics-claude-3-7-sonnet-the-first-hybrid-reasoning-model-is-now-available-in-amazon-bedrock/)

## Overview

Claude 3.7 Sonnet was released on February 24, 2025, and was Anthropic's first hybrid reasoning model. A single model could either answer immediately or engage extended thinking to work through a problem step by step, with API users able to set a thinking budget of up to 128K tokens. It launched alongside the research preview of Claude Code.

On SWE-bench Verified, Claude 3.7 Sonnet reached 62.3% in standard mode and 70.3% with extended thinking and additional scaffolding, leading the field on agentic coding at the time. Anthropic also reported it reduced unnecessary refusals by 45% compared with Claude 3.5 Sonnet, making it more useful on borderline requests.

Claude 3.7 Sonnet has a 200K token context window and up to 128K output tokens, and supports text and vision input, at $3 / $15 per million tokens (output pricing includes thinking tokens). The dated snapshot claude-3-7-sonnet-20250219 was retired on February 19, 2026; Anthropic recommends Sonnet 4.6 as the replacement.

## Benchmarks

- SWE-bench Verified (standard): 62.3% ([source](https://www.anthropic.com/news/claude-3-7-sonnet))
- SWE-bench Verified (with scaffolding): 70.3% ([source](https://www.anthropic.com/news/claude-3-7-sonnet))

## Pricing

- Input: $3.00 per million tokens
- Output: $15.00 per million tokens

Output price includes thinking (reasoning) tokens.

Source: https://www.anthropic.com/news/claude-3-7-sonnet

## Strengths

- First Claude model with toggleable extended thinking in one model
- Configurable thinking budget up to 128K tokens via the API
- Leading agentic-coding performance at launch (up to ~70% SWE-bench)
- 45% fewer unnecessary refusals than Claude 3.5 Sonnet
- Launched with the Claude Code agentic coding tool

## Best for

- Agentic coding and software-engineering tasks via Claude Code
- Math and science problems benefiting from extended thinking
- Front-end and full-stack web development
- Multimodal reasoning over text and images
- Tasks needing controllable reasoning depth and cost

## How to access

- [Anthropic](https://www.anthropic.com/news/claude-3-7-sonnet) — model id `claude-3-7-sonnet-20250219`
- [Amazon Bedrock](https://aws.amazon.com/blogs/aws/anthropics-claude-3-7-sonnet-the-first-hybrid-reasoning-model-is-now-available-in-amazon-bedrock/) — model id `anthropic.claude-3-7-sonnet-20250219-v1:0`

## Claude Sonnet versions

- [Claude Sonnet 4.6](https://ai-tldr.dev/models/claude-sonnet-4-6/) (17 February 2026)
- [Claude Sonnet 4.5](https://ai-tldr.dev/models/claude-sonnet-4-5/) (29 September 2025)
- [Claude Sonnet 4](https://ai-tldr.dev/models/claude-sonnet-4/) (22 May 2025)
- Claude 3.7 Sonnet (24 February 2025) — this page
- [Claude 3.5 Sonnet (new)](https://ai-tldr.dev/models/claude-3-5-sonnet-v2/) (22 October 2024)
- [Claude 3.5 Sonnet](https://ai-tldr.dev/models/claude-3-5-sonnet/) (20 June 2024)
- [Claude 3 Sonnet](https://ai-tldr.dev/models/claude-3-sonnet/) (4 March 2024)

## FAQ

### What made Claude 3.7 Sonnet different?

It was Anthropic's first hybrid reasoning model: a single model that can answer quickly or switch on extended thinking, with a configurable thinking budget up to 128K tokens.

### How did it score on SWE-bench Verified?

62.3% in standard mode and up to 70.3% with extended thinking and additional scaffolding, leading agentic coding at launch.

### What is the context window and max output?

200K token context window with up to 128K output tokens (which include extended-thinking tokens).

### Is Claude 3.7 Sonnet still available?

No. The claude-3-7-sonnet-20250219 snapshot was retired on February 19, 2026. Anthropic recommends Claude Sonnet 4.6 as the drop-in replacement.

## Links

- [Claude 3.7 Sonnet and Claude Code](https://www.anthropic.com/news/claude-3-7-sonnet)
- [Claude 3.7 Sonnet on Amazon Bedrock (AWS)](https://aws.amazon.com/blogs/aws/anthropics-claude-3-7-sonnet-the-first-hybrid-reasoning-model-is-now-available-in-amazon-bedrock/)
- [The Batch: Hybrid reasoning and extended thinking](https://www.deeplearning.ai/the-batch/claude-3-7-sonnet-introduces-hybrid-reasoning-and-extended-thinking/)
- [Anthropic model deprecations (retirement dates)](https://platform.claude.com/docs/en/about-claude/model-deprecations)

Source: AI/TLDR LLM registry, https://ai-tldr.dev/models/claude-3-7-sonnet/