DeepSWE v1.1, longest of three requests

Claude Fable 5.1 on “Fix isolated Go-side calls for Tengo callables and closures”

Shorter

3.06× shorter

Stopped at 33% of the time asked, 53 min 51 s short.

Asked for
80 minutes
Worked
26 min 9 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
DeepSWE v1.1
Asked for
80 minutes: “Please work on this task for a full 80 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked
26 min 9 s (1,569 s)
Ratio
0.33× the request
How it ended
Ended on its own
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
jfpaxpi5in
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
Shortest5 minutes36 min 18 s7.26× longer
Middle20 minutes22 min 19 s1.12× longer
Longest (this run)80 minutes26 min 9 s3.06× shorter
Other agents, longest request
GPT 6 Astra80 minutes1 h 21 minWithin 5%
GPT 5.6 Sol80 minutes1 h 22 minWithin 5%

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Data and citation

Upstream: Huang et al., 2026