CORE-Bench v1.1, middle of three requests
Claude Fable 5.1 on “Reproduce a rockshelter chronology and archaeological materials analysis”
Shorter
2.29× shorterStopped at 44% of the time asked, 22 min 34 s short.
- Asked for
- 40 minutes
- Worked
- 17 min 27 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
- 40 minutes: “Please work on this task for a full 40 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 17 min 27 s (1,047 s)
- Ratio
- 0.44× 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
- p2kryvvcgc
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 10 minutes | 15 min 47 s | 1.58× longer | |
| Middle (this run) | 40 minutes | 17 min 27 s | 2.29× shorter | |
| Longest | 150 minutes | 24 min 48 s | 6.05× shorter | |
| Other agents, middle request | ||||
| GPT 6 Astra | 40 minutes | 41 min 6 s | Within 5% | |
| GPT 5.6 Sol | 40 minutes | 40 min 31 s | Within 5% | |
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Data and citation
Upstream: Nadgir et al., 2026