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Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models

Anthropic has released Claude Sonnet 5.5, which scores 70.6% on the Terminal-Bench 4.0 agentic coding test against 10.3% for Sonnet 5 and 66.4% for the more expensive Opus 5.5. It is the first Sonnet to ship with frontier-style cyber safeguards and with classifiers that block reasoning extraction.…

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Timeline · 2 reports

  1. 2026-09-28 19:16 · Mashable AI
    Anthropic releases Claude Sonnet 5.5, a faster and cheaper follow-up to Opus 5.5
  2. 2026-09-28 18:30 · The Next Web
    Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models

More stories

  1. Introducing Claude Sonnet 5.5 on AWS — AWS Machine Learning Blog
  2. Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner — TechCrunch AI
  3. Opus 5.5 — r/ClaudeAI
  4. Claude Sonnet 5.5 now available on AI Gateway — Vercel Blog
  5. Optimizing my AI subscriptions: Claude Pro (Opus) vs. ChatGPT Plus vs. Perplexity Pro? — r/AI_Agents
  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. Qwen3-VL 8B on a laptop vs Opus 5.5 / Sonnet 5 / GPT-5.6 on 137 messy documents: beat GPT-5.6 on tax forms, lost badly on Indian date formats[R] — r/MachineLearning

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