TUA-Bench, shortest of three requests

Claude Fable 5.1 on “Extract gym auditorium”

Longer

17.23× longer

Worked 17.2 times as long as asked, 20 min 17 s over.

Asked

Worked

Safety cutoff 40 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: TUA-Bench
Task: Extract gym auditorium
Asked for: 1.25 minutes: “Please work on this task for a full 1.25 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 21 min 32 s (1,292 s)
Ratio: 17.23× the request
How it ended: Ended on its own
Grade: Passed; It completed the task in full. The grader returned 1. Pass rule: Full completion: a reward of 1 on the final state.
Score: 100 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: gkbdgbzr23
Data release: 26 Sep 2026

The other requests for Claude Fable 5.1 on this task, and the other agents at this request
Fable on this task	Asked	Worked	Result
Shortest (this run)	1.25 minutes	21 min 32 s	17.23× longer
Middle	5 minutes	20 min 57 s	4.19× longer
Longest	20 minutes	22 min 12 s	1.11× longer
Other agents, shortest request
GPT 6 Astra	1.25 minutes	1 min 37 s	1.29× longer
GPT 5.6 Sol	1.25 minutes	7 min 6 s	5.68× longer
Muse Spark 1.3	1.25 minutes	3 min 20 s	2.66× longer

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Data and citation