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Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner

Anthropic has released the newest version of its mid-range model, boasting faster response times and less token burn.

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Timeline · 2 reports

  1. 2026-09-28 18:07 · Techmeme
    Anthropic releases Sonnet 5.5, saying it generates outputs 30%+ faster than Sonnet 5 and costs up to 30% less per task, and plans to release Haiku 5.5 soon (Anthropic)
  2. 2026-09-28 18:00 · TechCrunch AI
    Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner

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  1. Introducing Claude Sonnet 5.5 on AWS — AWS Machine Learning Blog
  2. Opus 5.5 — r/ClaudeAI
  3. Claude Sonnet 5.5 now available on AI Gateway — Vercel Blog
  4. Optimizing my AI subscriptions: Claude Pro (Opus) vs. ChatGPT Plus vs. Perplexity Pro? — r/AI_Agents
  5. Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models — The Next Web
  6. Did Anthropic’s A.I. Really Make a Scientific Discovery on Its Own? — New York Times AI
  7. Anthropic launches Claude Sonnet 5.5 with near-Opus performance at half the price — The New Stack AI
  8. When can we say AI made a scientific discovery? — MIT Technology Review AI

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