CORE-Bench v1.1, longest of three requests
Claude Fable 5.1 on “Run a continuous-time intelligent-reflecting-surface propagation model”
Shorter
2.04× shorterStopped at 49% of the time asked, 30 min 35 s short.
- Asked for
- 60 minutes
- Worked
- 29 min 25 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
- 29 min 25 s (1,765 s)
- Ratio
- 0.49× 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
- hq7pkwgfds
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 4 minutes | 17 min 47 s | 4.44× longer | |
| Middle | 15 minutes | 18 min 36 s | 1.24× longer | |
| Longest (this run) | 60 minutes | 29 min 25 s | 2.04× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 60 minutes | 1 h 1 min | Within 5% | |
| GPT 5.6 Sol | 60 minutes | 16 min 56 s | 3.54× shorter | |
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Data and citation
Upstream: Nadgir et al., 2026