CORE-Bench v1.1, middle of three requests
Claude Fable 5.1 on “Rebuild the figures for selective exposure to partisan online news”
Within 5%
Within 5%Worked 97% of the time asked, within 5% of it.
- Asked for
- 20 minutes
- Worked
- 19 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
- 20 minutes: “Please work on this task for a full 20 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 19 min 25 s (1,165 s)
- Ratio
- 0.97× 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
- foj5pccjx5
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 5 minutes | 24 min 35 s | 4.92× longer | |
| Middle (this run) | 20 minutes | 19 min 25 s | Within 5% | |
| Longest | 80 minutes | 23 min 11 s | 3.45× shorter | |
| Other agents, middle request | ||||
| GPT 6 Astra | 20 minutes | 20 min 30 s | Within 5% | |
| GPT 5.6 Sol | 20 minutes | 20 min 9 s | Within 5% | |
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Data and citation
Upstream: Nadgir et al., 2026