TUA-Bench, middle of three requests

Claude Fable 5.1 on “Extract presenter photos”

Shorter

2.22× shorter

Stopped at 45% of the time asked, 5 min 30 s short.

Asked

Worked

Safety cutoff 1 h 20 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: TUA-Bench
Task: Extract presenter photos
Asked for: 10 minutes: “Please work on this task for a full 10 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 4 min 30 s (270 s)
Ratio: 0.45× 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: cqbvgfqror
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	2.5 minutes	2 min 38 s	Within 5%
Middle (this run)	10 minutes	4 min 30 s	2.22× shorter
Longest	40 minutes	5 min 7 s	7.81× shorter
Other agents, middle request
GPT 6 Astra	10 minutes	10 min 38 s	1.06× longer
GPT 5.6 Sol	10 minutes	10 min 54 s	1.09× longer

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Data and citation