CORE-Bench v1.1, longest of three requests
Claude Fable 5.1 on “Execute the fibrous-media notebook and reproduce its pore-size result”
Shorter
7.41× shorterStopped at 13% of the time asked, 1 h 48 min short.
- Asked for
- 125 minutes
- Worked
- 16 min 52 s
- Grade
- Did not pass
- Score 0 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
- CORE-Bench v1.1
- Asked for
- 125 minutes: “Please work on this task for a full 125 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 16 min 52 s (1,012 s)
- Ratio
- 0.13× the request
- How it ended
- Ended on its own
- Grade
- Did not pass
- It did not get every answer right. The grader returned 0. Pass rule: Every answer correct, with numbers inside a 95% prediction interval.
- Score
- 0 of 100
- Graded during the run. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- nros7642ip
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 8 minutes | 5 min 8 s | 1.56× shorter | |
| Middle | 30 minutes | 11 min 30 s | 2.61× shorter | |
| Longest (this run) | 125 minutes | 16 min 52 s | 7.41× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 125 minutes | 2 h 6 min | Within 5% | |
| GPT 5.6 Sol | 125 minutes | 2 h 5 min | Within 5% | |
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Data and citation
Upstream: Nadgir et al., 2026