AppWorld, middle of three requests

Claude Fable 5.1 on “Send individualized acceptance or rejection replies using local decision templates”

Shorter

2.47× shorter

Stopped at 41% of the time asked, 5 min 57 s short.

Asked for
10 minutes
Worked
4 min 3 s
Grade
Passed
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
AppWorld
Asked for
10 minutes: “Please work on this task for a full 10 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked
4 min 3 s (243 s)
Ratio
0.41× the request
How it ended
Ended on its own
Grade
Passed
It passed every final-state test. The grader returned 1. Pass rule: Every final-state test passes.
Score
100 of 100
Graded during the run. The paper's value.
Wording
The standard sentence, used from 4 September 2026.
Run id
do64cdr2zi
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
Shortest2.5 minutes5 min 13 s2.09× longer
Middle (this run)10 minutes4 min 3 s2.47× shorter
Longest40 minutes5 min 50 s6.86× shorter
Other agents, middle request
GPT 6 Astra10 minutes10 min 41 s1.07× longer
GPT 5.6 Sol10 minutes11 min1.10× longer

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Data and citation

Upstream: Trivedi et al., 2024 (ACL)