AssistantBench, shortest of three requests

Claude Fable 5.1 on “AssistantBench validation task 4”

Shorter

1.24× shorter

Stopped at 80% of the time asked, 15 s short.

Asked for
1.25 minutes
Worked
1 min
Grade
Did not pass
Score 0 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
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
1 min (60 s)
Ratio
0.80× the request
How it ended
Ended on its own
Grade
Did not pass
It did not match the reference answer exactly. The grader returned 0. Pass rule: Exact match with the reference answer.
Score
0 of 100
Graded during the run. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
sfnhbw4h53
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)1.25 minutes1 min1.24× shorter
Middle5 minutes1 min 57 s2.56× shorter
Longest20 minutes2 min 6 s9.53× shorter
Other agents, shortest request
GPT 6 Astra1.25 minutes1 min 29 s1.18× longer
GPT 5.6 Sol1.25 minutes2 min 54 s2.31× longer

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Data and citation

Upstream: Yoran et al., 2024 (EMNLP)