PPTArena, longest of three requests

Claude Fable 5.1 on “Grid and baseline rhythm”

Shorter

1.74× shorter

Stopped at 57% of the time asked, 10 min 39 s short.

Asked for
25 minutes
Worked
14 min 22 s
Grade
Score 50 of 100
Instructions 2 of 5, visuals 3 of 5. Judged afterwards.
How it ended
Ended on its own
Every detail of this run
Agent
Claude Fable 5.1, in Claude Code
Benchmark
PPTArena
Asked for
25 minutes: “Please work on this task for a full 25 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked
14 min 22 s (862 s)
Ratio
0.57× the request
How it ended
Ended on its own
Grade
Instructions 2.00 of 5, visuals 3.00 of 5
Two 0-to-5 judge scores, instruction following (IF) and visual quality (VQ), each the median of 3 judge samples. No official pass rule.
Score
50 of 100
Judged afterwards. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
ohq75jwlcg
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
Shortest1.5 minutes10 min 49 s7.21× longer
Middle6 minutes10 min 10 s1.69× longer
Longest (this run)25 minutes14 min 22 s1.74× shorter
Other agents, longest request
GPT 6 Astra25 minutes25 min 39 sWithin 5%
GPT 5.6 Sol25 minutes6 min 42 s3.73× shorter

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Data and citation