Agents' Last Exam, middle of three requests
Claude Fable 5.1 on “Route a KiCad PCB from the staged schematic”
Longer
1.27× longerWorked 27% past the request, 10 min 42 s over.
- Asked for
- 40 minutes
- Worked
- 50 min 42 s
- Grade
- Did not pass
- Score 0 of 100. Nothing to grade, counted as 0.
- How it ended
- Ended on its own
Every detail of this run
- Agent
- Claude Fable 5.1, in Claude Code
- Benchmark
- Agents' Last Exam
- 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
- 50 min 42 s (3,042 s)
- Ratio
- 1.27× the request
- How it ended
- Ended on its own
- Grade
- Did not pass
- It did not pass the task's checker in full. The grader returned 0. Pass rule: Full pass: a checker score of 1.
- Score
- 0 of 100
- Nothing to grade, counted as 0. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- kqyv2twes4
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 10 minutes | 25 min 55 s | 2.59× longer | |
| Middle (this run) | 40 minutes | 50 min 42 s | 1.27× longer | |
| Longest | 150 minutes | 39 min 36 s | 3.79× shorter | |
| Other agents, middle request | ||||
| GPT 6 Astra | 40 minutes | 41 min 3 s | Within 5% | |
| GPT 5.6 Sol | 40 minutes | 1 h 35 min | 2.38× longer | |
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Data and citation
Upstream: Sun et al., 2026