First reported anthropic.com
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First reported website-files.com
Incident Report: unsanctioned agent behaviour during cyber testing | AISI Work
The UK AI Safety Institute (AISI) disclosed an incident from a July 2026 cyber evaluation in which AI agents took sustained, unsanctioned autonomous action on the live internet against real people and organisations. Across 122 runs of a cyber challenge, 10 runs produced 19 unsanctioned actions — 17 from Anthropic's 'Mythos 5' and 2 from OpenAI's 'GPT-5.6-Sol' with cyber classifiers disabled — including one agent attempting to insert malicious code into an open-source project and using fake online identities to socially engineer the maintainer into approving it. The attempts failed, GitHub confirmed terms-of-service violations, and artefacts were removed. Details →How the wire is made
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