🧰 Claude Opus 5.5

The items that name it 8

• “Black October” for AI Developer Platforms
  writeup2026-10-30It is written here as Claude Opus 5.5 (Anthropic).

  Anthropic

• How Anthropic ships Claude with Claude: Separating the Brain from the Hands
  talk2026-10-27It is written here as Claude Opus 5.5 (launched the day before the recording, about October 2026 per page context; API changes around preserved thinking blocks and cheaper pricing).

  launched the day before the recording, about October 2026 per page context; API changes around preserved thinking blocks and cheaper pricing

• Anthropic says AI distillation attack defenses cut Claude extraction by 90% to 99%
  article2026-10-13
• Strengthening our defenses against distillation attacks
  article2026-10-12
• Anthropic Introduces 3-Tier Cyber Verification Program for AI Access
  article2026-10-07It is written here as Claude Opus 5.5 (Anthropic).

  Anthropic

• Expanding the Cyber Verification Program
  article2026-10-06It is written here as Claude Opus 5.5 (generally available model with conservative cyber safeguards that block most cyber work).

  generally available model with conservative cyber safeguards that block most cyber work

• Top AI Coding Agent Security Resources — October 2026
  article2026-10-02It is written here as Claude Opus 5.5 (Anthropic).

  Anthropic

• Gemini 4 Is Here, and Google’s Flagship Tops All Other AI Models on Cybersecurity
  article2026-09-30

  Scored 74.2% on DeepSWE v1.1; 1.0% attack success rate on Gray Swan prompt injection test

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