GPQA Diamond, shortest of three requests

Claude Fable 5.1 on “GPQA Diamond closed-book question 9 (Chemistry)”

Longer

3.05× longer

Worked 205% past the request, 2 min 34 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: GPQA Diamond
Task: GPQA Diamond closed-book question 9 (Chemistry)
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: 3 min 49 s (229 s)
Ratio: 3.05× the request
How it ended: Ended on its own
Grade: Passed; It picked the correct letter. The grader returned 1. Pass rule: The answer letter matches the key.
Score: 100 of 100; Graded during the run. The paper's value.
Clock tool: The agent could call a clock tool to check the requested time.
Wording: The standard sentence, used from 4 September 2026.
Run id: hwb6vsz66z
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	3 min 49 s	3.05× longer
Middle	5 minutes	1 min 23 s	3.61× shorter
Longest	20 minutes	2 min 13 s	9.02× shorter
Other agents, shortest request
GPT 6 Astra	1.25 minutes	1 min 23 s	1.11× longer
GPT 5.6 Sol	1.25 minutes	2 min 1 s	1.62× longer
Muse Spark 1.3	1.25 minutes	1 min 54 s	1.53× longer

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Data and citation