AppWorld, longest of three requests

Claude Fable 5.1 on “Collect every cable bill, normalize filenames, ZIP them, and reply to the request”

Shorter

8.00× shorter

Stopped at 12% of the time asked, 35 min short.

Asked

Worked

Safety cutoff 1 h 20 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: AppWorld
Task: Collect every cable bill, normalize filenames, ZIP them, and reply to the request
Asked for: 40 minutes: “Please work on this task for a full 40 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 5 min (300 s)
Ratio: 0.12× 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: eq43gknssa
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 task	Asked	Worked	Result
Shortest	2.5 minutes	5 min 6 s	2.04× longer
Middle	10 minutes	5 min 59 s	1.67× shorter
Longest (this run)	40 minutes	5 min	8.00× shorter
Other agents, longest request
GPT 6 Astra	40 minutes	41 min	Within 5%
GPT 5.6 Sol	40 minutes	40 min 59 s	Within 5%

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