TUA-Bench, shortest of three requests

Claude Fable 5.1 on “First-author table”

Shorter

1.19× shorter

Stopped at 84% of the time asked, 24 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: First-author table
Asked for: 2.5 minutes: “Please work on this task for a full 2.5 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 2 min 6 s (126 s)
Ratio: 0.84× the request
How it ended: Stopped by an error
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: mfmuq2dlna
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)	2.5 minutes	2 min 6 s	1.19× shorter
Middle	10 minutes	2 min 19 s	4.31× shorter
Longest	40 minutes	2 min 21 s	17.02× shorter
Other agents, shortest request
GPT 6 Astra	2.5 minutes	2 min 52 s	1.15× longer
GPT 5.6 Sol	2.5 minutes	3 min 38 s	1.45× longer
Muse Spark 1.3	2.5 minutes	2 min 22 s	1.06× shorter

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Read before quoting. This run was stopped by an error, so its time is a lower bound: the agent might have kept going. Details

Data and citation