CORE-Bench v1.1, longest of three requests
Claude Fable 5.1 on “Run a quantum measurement and tomography toolbox”
Shorter
5.27× shorterStopped at 19% of the time asked, 48 min 37 s short.
- Asked for
- 60 minutes
- Worked
- 11 min 24 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
- 60 minutes: “Please work on this task for a full 60 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 11 min 24 s (684 s)
- Ratio
- 0.19× 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
- f3fijl5suv
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 4 minutes | 4 min 9 s | Within 5% | |
| Middle | 15 minutes | 6 min 36 s | 2.27× shorter | |
| Longest (this run) | 60 minutes | 11 min 24 s | 5.27× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 60 minutes | 1 h 1 min | Within 5% | |
| GPT 5.6 Sol | 60 minutes | 1 h 1 min | Within 5% | |
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Data and citation
Upstream: Nadgir et al., 2026