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Claude Sonnet 4

Model family: Claude
Claude Sonnet 4 is Anthropicโ€™s versatile Claude 4โ€“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 windowโ€”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.
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 thatโ€™s practical for most AI use cases, including user-facing AI assistants and high-volume tasks.

About Anthropic

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

Industry: Research Services
Company Size: 2300-2900
Location: San Francisco, California, US
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Tools using Claude Sonnet 4

Last updated: February 26, 2026
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