WildClawBench, longest of three requests

Claude Fable 5.1 on “Optimize 30 calendar events plus 15 meeting requests under constraints”

Shorter

1.21× shorter

Stopped at 83% of the time asked, 2 min 34 s short.

Asked for
15 minutes
Worked
12 min 26 s
Grade
Score 100 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
WildClawBench
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
12 min 26 s (746 s)
Ratio
0.83× the request
How it ended
Ended on its own
Grade
1
Task grader score, 0 to 1 (a model judge only where the task calls for one). No official pass rule.
Score
100 of 100
Graded during the run. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
fkaqvjfpwa
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
Shortest1 minute9 min 50 s9.82× longer
Middle4 minutes7 min 12 s1.80× longer
Longest (this run)15 minutes12 min 26 s1.21× shorter
Other agents, longest request
GPT 6 Astra15 minutes15 min 28 sWithin 5%
GPT 5.6 Sol15 minutes11 min 9 s1.34× shorter

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Data and citation

Upstream: Ding et al., 2026