TUA-Bench, longest of three requests

Claude Fable 5.1 on “First-author table”

Shorter

17.02× shorter

Stopped at 6% of the time asked, 37 min 39 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: 40 minutes: “Please work on this task for a full 40 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 2 min 21 s (141 s)
Ratio: 0.06× 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: yk2siasxyx
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 6 s	1.19× shorter
Middle	10 minutes	2 min 19 s	4.31× shorter
Longest (this run)	40 minutes	2 min 21 s	17.02× shorter
Other agents, longest request
GPT 6 Astra	40 minutes	40 min 39 s	Within 5%
GPT 5.6 Sol	40 minutes	41 min 11 s	Within 5%
Muse Spark 1.3	40 minutes	1 min 48 s	22.30× 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