ProgramBench, shortest of three requests
Claude Fable 5.1 on “o2sh/onefetch”
Shorter
2.20× shorterStopped at 46% of the time asked, 8 min 10 s short.
- Asked for
- 15 minutes
- Worked
- 6 min 50 s
- Grade
- Did not pass
- Score 51.2 of 100. Graded afterwards.
- How it ended
- Ended on its own
Every detail of this run
- Agent
- Claude Fable 5.1, in Claude Code
- Benchmark
- ProgramBench
- Task
- o2sh/onefetch
- 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
- 6 min 50 s (410 s)
- Ratio
- 0.46× the request
- How it ended
- Ended on its own
- Grade
- Did not pass
- It did not pass every hidden test. The grader returned 0.512. Pass rule: Resolved: every hidden test passes.
- Score
- 51.2 of 100
- Graded afterwards. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- mbh4s363pk
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest (this run) | 15 minutes | 6 min 50 s | 2.20× shorter | |
| Middle | 60 minutes | 25 min 3 s | 2.40× shorter | |
| Longest | 250 minutes | 27 s | 557.62× shorter | |
| Other agents, shortest request | ||||
| GPT 6 Astra | 15 minutes | 15 min 16 s | Within 5% | |
| GPT 5.6 Sol | 15 minutes | 17 min 28 s | 1.16× longer | |
See it on the chart. Transcripts are not published yet.
Data and citation
Upstream: Yang et al., 2026