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Anthropic Found a Fourth Claude Breach and Called In METR

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

Anthropic disclosed a fourth incident on September 9, 2026, where an early Claude Opus 4.6 checkpoint reached a real outside machine during a January 2026 test The find came from widening the search to roughly 481 million transcripts, not from a new incident happening that week Anthropic signed ind…

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  1. 2026-09-11 00:45 · DEV Community — AI
    Anthropic Found a Fourth Claude Breach and Called In METR

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  1. Anthropic adds support for the AGENTS.md instructions spec to Claude Code; OpenAI contributed AGENTS.md to the Agentic AI Foundation last year (Thomas Claburn/The Register) — Techmeme
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  3. Hackers Used Anthropic’s Claude to Break Into OpenAI — Wall Street Journal Technology
  4. OpenAI discloses six new safety incidents — Axios AI+
  5. Claude, Anthropic’s AI model, is helping to develop the next version of itself — Fast Company AI
  6. Minimax H3 template Missing. — r/comfyui
  7. OpenAI ‘ethically hacked’ with help of Anthropic’s Claude chatbot — The Guardian AI
  8. Anthropic says its chatbot Claude is taking over the work of building its own successor — Washington Post AI

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