OSWorld 2.0, longest of three requests

Claude Fable 5.1 on “GeoGebra vase and volume”

Shorter

1.34× shorter

Stopped at 74% of the time asked, 1 h 4 min short.

Asked for
250 minutes
Worked
3 h 6 min
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
250 minutes: “Please work on this task for a full 250 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked
3 h 6 min (11,157 s)
Ratio
0.74× 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
65bg3ahau5
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
Shortest15 minutes15 min 21 sWithin 5%
Middle60 minutes52 min 8 s1.15× shorter
Longest (this run)250 minutes3 h 6 min1.34× shorter
Other agents, longest request
GPT 6 Astra250 minutes4 h 13 minWithin 5%
GPT 5.6 Sol250 minutes4 h 12 minWithin 5%

See it on the chart. Transcripts are not published yet.

Data and citation

Upstream: Yuan et al., 2026