DeepSWE v1.1, shortest of three requests

Claude Fable 5.1 on “Add duration-aware sharding to Vitest”

Longer

3.25× longer

Worked 225% past the request, 11 min 14 s over.

Asked

Worked

Safety cutoff 2 h 40 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: DeepSWE v1.1
Task: Add duration-aware sharding to Vitest
Asked for: 5 minutes: “Please work on this task for a full 5 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 16 min 14 s (974 s)
Ratio: 3.25× the request
How it ended: Ending not labelled yet
Grade: Passed; It passed its hidden tests. The grader returned 1. Pass rule: The hidden tests pass.
Score: 100 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: skoxoxr3qe
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)	5 minutes	16 min 14 s	3.25× longer
Middle	20 minutes	20 min 7 s	Within 5%
Longest	80 minutes	27 min 50 s	2.87× shorter
Other agents, shortest request
GPT 6 Astra	5 minutes	5 min 32 s	1.11× longer
GPT 5.6 Sol	5 minutes	14 min 39 s	2.93× longer

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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