OSWorld 2.0, shortest of three requests

Claude Fable 5.1 on “Invoices, photos, and email”

Longer

1.25× longer

Worked 25% past the request, 3 min 45 s over.

Asked

Worked

Safety cutoff 8 h 20 min, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: OSWorld 2.0
Task: Invoices, photos, and email
Asked for: 15 minutes: “Please work on this task for a full 15 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 18 min 45 s (1,125 s)
Ratio: 1.25× the request
How it ended: Ended on its own
Grade: Did not pass; It did not meet every checkpoint. The grader returned 0.35. Pass rule: Binary completion: a score of 1.00, with every checkpoint met.
Score: 35 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: zrfvdu2tkq
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 (this run)	15 minutes	18 min 45 s	1.25× longer
Middle	60 minutes	1 h 1 min	Within 5%
Longest	250 minutes	39 min 40 s	6.30× shorter
Other agents, shortest request
GPT 6 Astra	15 minutes	25 min 51 s	1.72× longer
GPT 5.6 Sol	15 minutes	58 min 59 s	3.93× longer

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Data and citation