CORE-Bench v1.1, shortest of three requests
Claude Fable 5.1 on “Run a quantum measurement and tomography toolbox”
Within 5%
Within 5%Worked 104% of the time asked, within 5% of it.
- Asked for
- 4 minutes
- Worked
- 4 min 9 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
- 4 minutes: “Please work on this task for a full 4 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 4 min 9 s (249 s)
- Ratio
- 1.04× 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
- vtktcx3bif
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest (this run) | 4 minutes | 4 min 9 s | Within 5% | |
| Middle | 15 minutes | 6 min 36 s | 2.27× shorter | |
| Longest | 60 minutes | 11 min 24 s | 5.27× shorter | |
| Other agents, shortest request | ||||
| GPT 6 Astra | 4 minutes | 4 min 19 s | 1.08× longer | |
| GPT 5.6 Sol | 4 minutes | 7 min 33 s | 1.89× longer | |
See it on the chart. Transcripts are not published yet.
Data and citation
Upstream: Nadgir et al., 2026