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Sonnet 4

Sonnet 4

By Anthropic
New Text Gen 3
Released: May 22, 2025

Overview

Claude Sonnet 4 improves on Claude Sonnet 3.7 across a variety of areas, especially coding. It offers frontier performance that’s practical for most AI use cases, including user-facing AI assistants and high-volume tasks.

Description

Claude Sonnet 4 is Anthropic’s versatile Claude 4–tier model, upgraded over 3.7 to deliver stronger coding, analysis, and instruction-following. It pairs high accuracy with practical speed and now supports up to a 1M-token context window—enough for entire codebases or many papers in one go. Designed for reliable tool use and long-form reasoning, Sonnet 4 balances capability, cost, and latency for everyday builds and complex agentic workflows. Available via the Anthropic API and major clouds too.

About Anthropic

Anthropic is a technology company specializing in artificial intelligence and machine learning solutions.

Industry: Research Services
Company Size: 51-200
Location: California, US
Website: anthropic.com
View Company Profile

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Last updated: November 6, 2025