UK AISI finds autonomous cyber task horizons doubling every few months
UK AISI found that frontier models' 80-percent-reliability cyber task horizon had doubled every 4.7 months since late 2024, with GPT-5.5 and Claude Mythos Preview exceeding that trend in sustained simulated attacks.
TOWARD DOOM64confidence 94/100
Why it moved the index
The evaluation measures sustained autonomous cyber exploitation, and a later UK government action explicitly says this research informed policymaking, establishing practical security and governance impact rather than benchmark significance alone.
AUDIT TRAIL
Assessment history
- R1Toward 64 · confidence 94
New practical-impact capability evidence from a dated government evaluation and a separately dated policy-impact source.
11 Aug 2026