PaperBench, shortest of three requests

Claude Fable 5.1 on “Bridging Data Gaps”

Shorter

2.36× shorter

Stopped at 42% of the time asked, 7 min 12 s short.

Asked

Worked

Safety cutoff 6 h 40 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: PaperBench
Task: Bridging Data Gaps
Asked for: 12.5 minutes: “Please work on this task for a full 12.5 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 5 min 18 s (318 s)
Ratio: 0.42× the request
How it ended: Ending not labelled yet
Grade: 0.194; Replication score: a weighted rubric of pass/fail leaf checks, 0 to 1, after a full reproduction attempt. No official pass rule.
Score: 19.4 of 100; Judged afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: zz25wzhlya
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)	12.5 minutes	5 min 18 s	2.36× shorter
Middle	50 minutes	15 min 13 s	3.29× shorter
Longest	200 minutes	45 min 29 s	4.40× shorter
Other agents, shortest request
GPT 6 Astra	12.5 minutes	12 min 39 s	Within 5%
GPT 5.6 Sol	12.5 minutes	6 min 11 s	2.02× shorter

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Read before quoting. How this run ended has not been labelled yet. It is timed like every other run and counted in every number. Details

Data and citation