🧰 Claude Fable 5.1

The items that name it 9

• “Black October” for AI Developer Platforms
  writeupas affected products2026-10-30It is written here as Claude Fable 5.1 (Anthropic).

  Anthropic

• Anthropic says AI distillation attack defenses cut Claude extraction by 90% to 99%
  articleas affected products2026-10-13
• Strengthening our defenses against distillation attacks
  articleas affected products2026-10-12
• Anthropic Introduces 3-Tier Cyber Verification Program for AI Access
  articleas affected products2026-10-07It is written here as Claude Fable 5.1 (Anthropic).

  Anthropic

• Expanding the Cyber Verification Program
  articleas affected products2026-10-06It is written here as Claude Fable 5.1 (generally available model with conservative cyber safeguards; with zero data retention it can also use CVP with zero data retention until EFS is available).

  generally available model with conservative cyber safeguards; with zero data retention it can also use CVP with zero data retention until EFS is available

• Gemini 4 Is Here, and Google’s Flagship Tops All Other AI Models on Cybersecurity
  articleas affected products2026-09-30

  Scored 67.4% on DeepSWE v1.1; 1.0% attack success rate on Gray Swan prompt injection test

• Instrumental Monitor Evasion Emerges Under Ordinary Task Pressure
  paperas affected products2026-09-24

  LLM agent evaluated in EvasionBench; succeeds less often at evasion but frequently makes creative attempts to circumvent the monitor

• Two new frontier models posted their best-ever scores on the Endor Labs Agent Security League | Blog | Endor Labs
  articleas tools2026-09-08

  frontier AI model (Anthropic) tested on Claude Code, top-scoring in the benchmark: 87.2% FuncPass, 37.4% SecPass

• Google, Anthropic, and OpenAI Unveil Cyber AI Models, Safeguards, and Access Programs
  articleas affected products

  Anthropic model now allowed for identifying software vulnerabilities

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