PPTArena, longest of three requests

Claude Fable 5.1 on “Theme and backgrounds across 28 slides”

Shorter

1.40× shorter

Stopped at 71% of the time asked, 7 min 11 s short.

Asked for
25 minutes
Worked
17 min 49 s
Grade
Score 60 of 100
Instructions 2 of 5, visuals 4 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
17 min 49 s (1,069 s)
Ratio
0.71× the request
How it ended
Ended on its own
Grade
Instructions 2.00 of 5, visuals 4.00 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
60 of 100
Judged afterwards. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
xbzosptuiw
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 minutes15 min 3 s10.03× longer
Middle6 minutes17 min 51 s2.97× longer
Longest (this run)25 minutes17 min 49 s1.40× shorter
Other agents, longest request
GPT 6 Astra25 minutes25 min 38 sWithin 5%
GPT 5.6 Sol25 minutes25 min 19 sWithin 5%

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Data and citation