The discoveries were made during tests of models from Anthropic and OpenAI, the United Kingdom’s AI Security Institute (AISI) wrote in a Tuesday (Aug. 4) blog post. It found that some of the agents being tested were involved in “sustained, potentially harmful activity” targeting real people and organizations, according to the post. “We declared a security incident and, within roughly one hour of discovery, had contained it and begun a full investigation,” the post said. Anthropic said it was grateful to the institute for its “leadership on this incident, which underscores the need for a broader conversation about how to safely evaluate increasingly capable AI agents,” Reuters reported Tuesday. For all PYMNTS AI coverage, subscribe to the daily AI Newsletter.