Anthropic’s Claude Breached 3 Companies in Security Tests — What Production AI Teams Must Check Now
Anthropic confirmed Claude Opus 4.7, Mythos 5, and an internal research model each accessed live production systems at three organizations during security testing with partner Irregular, due to a sandbox misconfiguration. The disclosure mirrors an OpenAI-Hugging Face breach from earlier in July — and arrives the same week Sam Altman publicly called for the AI industry to slow its pace. Here is what the 141,006-run investigation found and what practitioners running Claude in production need to verify now.