---
id: "2025-02-24-claude-3-7-sonnet-claude-code"
url: "https://postcutoff.com/e/2025-02-24-claude-3-7-sonnet-claude-code/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2025-02-24"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 2
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2025-02-24-claude-3-7-sonnet-claude-code/

# Claude 3.7 Sonnet (hybrid reasoning) and Claude Code preview

Anthropic released Claude 3.7 Sonnet, the first hybrid reasoning model able to answer instantly or use visible extended thinking, together with a research preview of Claude Code, an agentic coding tool that runs in the terminal.

## Key facts
- Released 24 February 2025
- Extended thinking mode with user-controllable thinking budget via API
- SWE-bench Verified: 62.3% (70.3% with custom scaffold), per Anthropic
- Claude Code launched as a limited research preview; generally available with Claude 4 in May 2025

## What happened

Anthropic combined fast responses and deep reasoning in one model and shipped a command-line agent that edits code, runs tests and commits on its own.

## Why it matters

Claude Code became a breakout product and a template for terminal coding agents (Codex CLI, Gemini CLI), shifting software development toward agent delegation.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Claude 3.7 Sonnet and Claude Code (Anthropic)](https://www.anthropic.com/news/claude-3-7-sonnet) (anthropic.com, official)
2. [Claude Code documentation](https://docs.anthropic.com/en/docs/claude-code/overview) (docs.anthropic.com, docs)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2025-05-22: [Anthropic releases Claude Opus 4 and Sonnet 4](https://postcutoff.com/e/2025-05-22-claude-4/index.md)
- 2024-10-22: [Anthropic releases computer use for Claude 3.5 Sonnet](https://postcutoff.com/e/2024-10-22-claude-computer-use/index.md)