DeepSWE v1.1, longest of three requests

Claude Fable 5.1 on “Reconstruct template strings in OPA partial-evaluation output”

Shorter

2.40× shorter

Stopped at 42% of the time asked, 1 h 28 min short.

Asked

Worked

Safety cutoff 5 h, off the scale

Every detail of this run

Agent: Claude Fable 5.1, in Claude Code
Benchmark: DeepSWE v1.1
Task: Reconstruct template strings in OPA partial-evaluation output
Asked for: 150 minutes: “Please work on this task for a full 150 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 1 h 2 min (3,745 s)
Ratio: 0.42× 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 afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: hacysmbtx5
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	10 minutes	41 min 22 s	4.14× longer
Middle	40 minutes	26 min 21 s	1.52× shorter
Longest (this run)	150 minutes	1 h 2 min	2.40× shorter
Other agents, longest request
GPT 6 Astra	150 minutes	2 h 31 min	Within 5%
GPT 5.6 Sol	150 minutes	2 h 31 min	Within 5%

See it on the chart. Transcripts are not published yet.

Read before quoting. How this run ended has not been labelled yet. It is timed like every other run and counted in every number. Details

Data and citation