What Is a Stopping Rule, and Why Write It in Advance?
A stopping rule answers 4 things: what condition pauses the system, who is allowed to pause it, within what time, and what has to be true before it restarts. It is written before the system scales because nobody negotiates it fairly in the middle of an incident, when stopping costs something concrete and carrying on costs nothing yet.
This is narrower, and I think more useful, than the broader question: what is our AI policy. A policy describes what is allowed. A stopping rule describes what happens when something looks wrong and nobody is sure.
An organisation that wrote it down
The next example is an organisation that reports "great cost and delays" to its own research from meeting its standard, and wrote the rule down anyway. OpenAI, describing its own research programme in August 2026, sets 2 clocks, not 1.
- The first clock is on raising the alert. "We aim to issue an alert within 30 minutes after concerning activity is surfaced through our monitoring system."
- The second is on deciding. For its highest-priority alerts, the teams that are paged have 30 minutes: if they "cannot conclusively determine within 30 minutes that the flag is a false positive, those teams are expected to pause the activity".
It also put a number on the monitoring itself: a current estimate of roughly 20% of the inference compute being monitored, hedged in the same sentence as varying substantially from one workload to another. That is its own estimate of its own overhead. It is not a benchmark, and no other firm should plan on it.
And it stopped work to meet its own standard. The same page reports a 2-week pause in reinforcement-learning training on its latest models intended for deployment, and says that its largest planned run of that kind was still on hold when the page was published on 18 August.
What happened next is the part worth copying
A later page completes the story. In a follow-up dated 1 September, OpenAI wrote that on 28 August it "restarted the large frontier RL run that was previously paused after the new safety and security requirements were put in place", while continuing to hold back some smaller experimental runs.
As I read the 2 pages together, the hold had a condition, and when the condition was met the work resumed. A stop with no restart condition is how a pause can quietly turn into an abandonment, which is the pilot problem again in a different place.
What transfers to a professional firm
None of the engineering does. On my reading, the posture does.
- Oversight is priced, not asserted: a published estimate, however hedged, in place of a value in a policy document.
- For the most serious alerts, the default when nobody can clear the flag is to stop, not to carry on: written down, with a clock on it.
- The rule says what restarts the work: a named requirement, so that a pause has an end.
- The standard is set by the risk of the environment, not by the convenience of the team working in it.
For an expert-led firm the equivalents are ordinary. As illustrations, not reports of anything that happened: an output that reaches a client without its named review, a figure that does not reconcile with its source, a reviewer who says outputs are being approved unread. Name the condition, name the person who may pause, name the hours within which they must decide, and name what has to be true before the work restarts.
Does All of This Have to Be in Place Before You Start?
No. Start with the boundary tight, measure what it wrongly blocks, and loosen it on evidence. Read together, the 3 sections above could be heard as do all this before you are allowed to begin. That would be bad advice, and it is not what the next example did.
Anthropic, describing one of its own models in August 2026, launched with a safety classifier it describes as very broad, knowing that this would produce "a high number of false positives in the near term", with the affected requests sent to a less capable model. It costed the alternative out loud: holding the model back until much more progress had been made on safeguards would have delayed general access "by weeks or months". It chose not to wait.
It then did the second half. It rewrote the classifier's rules to carve out benign uses, took feedback from experts inside and outside the company, retrained the classifier, and reported from its own testing a substantial reduction in false positives. It also kept part of the boundary where it was: the page says plainly that some categories of request are still blocked, and that some false positives will remain.
The transferable rule: an over-restrictive boundary you can measure and relax beats a perfect policy you have not shipped. And the loosening is selective. Evidence earns more room for the work it covers, not for everything at once.
The other branch is, in my experience, a familiar one in expert-led firms: the decision goes to a committee, a policy is drafted over months, and adoption stays where it was. So this is not gate-keeping. It is instrumentation.
My own production routines run to the same shape. They stop and report when they cannot complete a task, and they do not improvise. The rule that makes them stop is written into the routine's specification, not decided in the moment by whoever happens to be watching.