Cheaper than Opus at $3/$15, though newer models have since taken over in the apps, so this is mostly for existing API users.

Kenning's take

What it does

Claude Sonnet 4.6 upgraded Sonnet's coding, computer use, long-context reasoning, agent planning and design skills, with a 1 million token context window in beta. At launch it became the default model on Claude's Free and Pro plans. It is priced at $3/$15 per million tokens and is still offered in the API.

• 1M token context window (beta)
• Improved coding and instruction following
• Better computer use than earlier Sonnet models
• Default on Free and Pro at launch

Who it suits. Developers and Claude users who want a cheaper model than Opus.

Key facts

Category

AI models

Part of

Claude

Made by

Anthropic

Based in

United States

Released

17 February 2026

How to get it

still available in the Claude API and on Amazon Bedrock, Google Cloud and Microsoft Foundry (listed as active on Anthropic's deprecation page); in the Claude apps it has been followed by newer models

Works on

API, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry

In the UK

Yes

API price

$3 per million input tokens, $15 per million output tokens

FAQ

Facts from the maker's own pages and the sources listed. Checked 2026-10-11.