CORE-Bench v1.1, longest of three requests
Claude Fable 5.1 on “Reproduce journal and university ranking figures”
Shorter
4.15× shorterStopped at 24% of the time asked, 1 h 16 min short.
- Asked for
- 100 minutes
- Worked
- 24 min 7 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
- 100 minutes: “Please work on this task for a full 100 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 24 min 7 s (1,447 s)
- Ratio
- 0.24× 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
- qrnvaj5z5o
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 6 minutes | 9 min 42 s | 1.62× longer | |
| Middle | 25 minutes | 16 min 55 s | 1.48× shorter | |
| Longest (this run) | 100 minutes | 24 min 7 s | 4.15× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 100 minutes | 1 h 41 min | Within 5% | |
| GPT 5.6 Sol | 100 minutes | 1 h 41 min | Within 5% | |
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Data and citation
Upstream: Nadgir et al., 2026