Model by Anthropic

Claude Sonnet 5

Claude Sonnet 5 is Anthropic's mid-tier model for agentic coding at a low price, and it fits developers who want near-Opus results without Opus bills.

Checked 2026-11-05

Claude Sonnet 5 is Anthropic's mid-tier model for agentic coding at a low price, and it fits developers who want near-Opus results without Opus bills. Anthropic published it on 30 June 2026 and now marks it legacy, with Sonnet 5.5 as the current Sonnet. It has a 1 million token context window, 128 thousand tokens of output, adaptive thinking with effort levels, and a reliable knowledge cutoff of January 2026. Price is $2 per million input tokens and $10 per million output tokens. An edit dated 10 August 2026 made that introductory rate permanent, replacing the earlier $3 and $15. Anthropic says the new tokenizer can turn the same text into roughly 1.0 to 1.35 times more tokens, so compare cost per task, not per token. Setting temperature, top_p or top_k returns an error. It is available as claude-sonnet-5 on the Claude API, and Anthropic says it will not retire before 30 June 2027. Its cyber ability is lower than the Opus models. We would pick Sonnet 5.5 for new builds and keep this one for pinned workloads. Figures come from Anthropic's announcement, its model page and OpenRouter. We have not run it ourselves.

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Questions

What is the context window of Claude Sonnet 5?

1,000,000 tokens, with up to 128,000 tokens of output.

How much does Claude Sonnet 5 cost?

$2 per million input tokens and $10 per million output tokens, checked 31 October 2026.

Can I run Claude Sonnet 5 on my own hardware?

No. The weights are not published, so you use it through the maker's API or a hosting provider.

Who makes Claude Sonnet 5?

Anthropic makes it, and released it on 30 June 2026.

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Where you can run it

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    OpenRouter routes more than 600 models through one API key.

    • Model gateway (router)
    • OpenAI compatible

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