Claude 4 Sonnet

About

Claude 4 Sonnet is Anthropic's balanced mid-tier model that strikes an optimal trade-off between capability, speed, and cost for professional users. It offers strong reasoning, coding, and creative writing abilities with a full 200K token context window while delivering significantly faster response times than Opus-tier models. Claude 4 Sonnet is designed as the everyday workhorse for professionals who need high-quality AI assistance across a broad range of tasks — software development, content creation, document analysis, research synthesis, and data interpretation — without the premium cost of Opus. What makes Sonnet the sweet spot in Anthropic's lineup is that it handles 90% of professional tasks with quality comparable to Opus but at approximately 20% of the cost and 2x the speed. For most practical applications, Sonnet is indistinguishable from Opus in output quality, making it the rational default choice. The 200K context window allows processing of full codebases, lengthy reports, or extensive research materials. Claude 4 Sonnet excels at structured outputs, following complex instructions precisely, and producing well-organized, thoughtful responses. It maintains Anthropic's strong safety alignment with Constitutional AI. Available through a free tier with daily message limits, Claude Pro (USD 20 per month) for unlimited access, and API access at USD 3.50 per 1M input tokens. For professional developers, writers, and analysts who use AI daily for diverse tasks, Claude 4 Sonnet offers the best combination of capability, speed, and cost — it's the model most users should choose as their daily driver, saving Opus for the hardest problems and Haiku for simple, high-volume tasks.

Best For

Pricing

Technical Specs

Related Models