UK AI Security Institute (AISI)
UK government body conducting pre-deployment evaluations of frontier AI models for cyber, biosecurity, and autonomy risks. Frequently runs joint evaluations with the US AISI (NIST AISIC). Originally the AI Safety Institute, since renamed the AI Security Institute (acronym AISI preserved); sources from both periods appear on the wiki.
Notable outputs
- Mythos cyber-ranges result (via Anthropic’s Glasswing update, 2026-05-22): AISI reports that Claude Mythos Preview is the first model to solve both of its cyber ranges — simulations of multistep cyberattacks — end to end. A neutral-government data point corroborating the Glasswing capability claims. See AISI’s How fast is autonomous AI cyber capability advancing?.
- Frontier AI Trends Report (aisi.gov.uk/frontier-ai-trends-report) — finds that “the length of cyber tasks that models can complete unassisted is doubling roughly every eight months.” Load-bearing data point for Class 2 (APT campaigns).
- Pre-deployment evaluation of upgraded Claude 3.5 Sonnet (aisi.gov.uk/blog/pre-deployment-evaluation-of-anthropics-upgraded-claude-3-5-sonnet) — the canonical “two AISIs evaluating one model upgrade” reference for Class 4 (model-version regression).
Relationship to standards
AISI evaluations are not regulation; they are advisory and inform the Anthropic Responsible Scaling Policy and equivalent vendor commitments tracked by METR’s Common Elements of Frontier AI Safety Policies.
See Also
- Agentic AI Threat Classes — 2026 Expansion — primary citation
- Apollo Research — peer organization