Claude 3.7 Sonnet

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Claude 3.7 Sonnet — the industry's first hybrid reasoning model, with a thinking budget of up to 128K

Why it matters

Declared the position that reasoning should be an integrated capability of frontier models, not a separate model

Source — Primary sources first; secondary reports are labelled “Press”

Officialanthropic.comhttps://www.anthropic.com/news/claude-3-7-sonnet

Added in Week 35, 2026 · See that week

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  2. This recordClaude 3.7 Sonnet
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In the model family tree — Claude family · 20 versions

  1. Earlier versionClaude 3.5 Haiku / upgraded 3.5 Sonnet
  2. This recordClaude 3.7 Sonnet
  3. Later versionClaude Opus 4 / Sonnet 4
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Same week

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