OSWorld 2.0, shortest of three requests

Claude Fable 5.1 on “GIMP composite”

Within 5%

Within 5%

Worked 96% of the time asked, within 5% of it.

Asked for
15 minutes
Worked
14 min 23 s
Grade
Did not pass
Score 20 of 100. Graded during the run.
How it ended
Ended on its own
Every detail of this run
Agent
Claude Fable 5.1, in Claude Code
Benchmark
OSWorld 2.0
Asked for
15 minutes: “Please work on this task for a full 15 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked
14 min 23 s (863 s)
Ratio
0.96× the request
How it ended
Ended on its own
Grade
Did not pass
It did not meet every checkpoint. The grader returned 0.2. Pass rule: Binary completion: a score of 1.00, with every checkpoint met.
Score
20 of 100
Graded during the run. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
chwswzuzut
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 taskAskedWorkedSplitResult
Shortest (this run)15 minutes14 min 23 sWithin 5%
Middle60 minutes3 h 9 min3.16× longer
Longest250 minutes2 h 9 min1.94× shorter
Other agents, shortest request
GPT 6 Astra15 minutes15 min 39 sWithin 5%
GPT 5.6 Sol15 minutes1 h 20 min5.33× longer

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Data and citation

Upstream: Yuan et al., 2026