DeepSWE v1.1, middle of three requests

Claude Fable 5.1 on “Add RFC 5545 timezone interoperability to dateutil recurrence parsing”

Longer

1.05× longer

Worked 5% past the request, 46 s over.

Asked

Worked

Safety cutoff 2 h, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: DeepSWE v1.1
Task: Add RFC 5545 timezone interoperability to dateutil recurrence parsing
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: 15 min 46 s (946 s)
Ratio: 1.05× the request
How it ended: Ending not labelled yet
Grade: Passed; It passed its hidden tests. The grader returned 1. Pass rule: The hidden tests pass.
Score: 100 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: j6qqyoq27x
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	4 minutes	25 min 8 s	6.28× longer
Middle (this run)	15 minutes	15 min 46 s	1.05× longer
Longest	60 minutes	27 min 40 s	2.17× shorter
Other agents, middle request
GPT 6 Astra	15 minutes	15 min 34 s	Within 5%
GPT 5.6 Sol	15 minutes	14 min 59 s	Within 5%

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