Compare Claude Sonnet 5 from Anthropic and Claude Sonnet 5.5 from Anthropic on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
Claude Sonnet 5Claude Sonnet 5.5Claude Sonnet 5 is the next generation of Anthropic's Sonnet model family. It is a drop-in upgrade for Claude Sonnet 4.6 with three behavior changes: adaptive thinking is on by default, manual extended thinking now returns a 400 error (it was deprecated on Claude Sonnet 4.6), and setting sampling parameters (temperature, top_p, top_k) to non-default values returns a 400 error
Claude Sonnet 5.5 is the next-generation product in Anthropic’s Sonnet model series; Claude Sonnet 5.5 offers the best balance between speed and intelligence. The following five major changes will affect code currently running on Claude Sonnet 5: 1. Using "between_tools" can disable up-front thinking. 2. Forcing the use of tools will result in an error. 3. Thinking content blocks are bound to the model and the conversation. 4. On the Claude API and Google Cloud, the older "computer_20251124" computer tool usage is no longer accepted. 5. The advisor tool will refuse to accept Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 as advisor models. Use between_tools to disable up-front thinking. Forcing tool use will return an error. Thinking blocks are bound to the model and the conversation. On the Claude API and Google Cloud, early computer_20251124 computer tool usage is no longer accepted. The advisor tool no longer accepts Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 as advisors.
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Claude Sonnet 5: $10/M output tokens; Claude Sonnet 5.5: $10/M. Use the cost calculator above to estimate your own workload.
Claude Sonnet 5: 1.0s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
Claude Sonnet 5 accepts 1,000,000 and Claude Sonnet 5.5 accepts 1,000,000 input tokens.
Claude Sonnet 5 at 7839.1 tok/s and Claude Sonnet 5.5 at 103.2 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
Claude Sonnet 5 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; Claude Sonnet 5.5 accepts text, image and PDF input.
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