No-CoT math time horizon
Models solve math problems without a visible chain of thought. Scored as the human task length in minutes the model solves reliably.
Third-party UK AISI measurement. Higher means more reasoning without visible CoT, which UK AISI treats as less monitorable.
- Made by
- UK AI Security Institute
- Released
- July 2026
- Kind
- Deception and alignment
- Level
- Competition
- Scored
- Checked automatically
- Answers
- Short answer
- Tasks
- Kept private
- Last in a system card
- September 2026
- Last model added
- September 2026
2
System cards report it, from 1 lab
No scores here yet
No lab, leaderboard or Epoch AI run has reported a score for No-CoT math time horizon yet.
Labs report it only in system cards
We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark. Some system cards do, below.
2 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| Sep 3, 2026 | GPT-6 Astra system card | 30.9 | UK AISI No-CoT math time horizon, 50%-reliability (9.3, Figure 41) | Monitorability |
| Jul 9, 2026 | GPT-5.6 Sol system card | 3.6 | UK AISI no-CoT math reasoning time horizon (9.2.2) | Monitorability |
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