Agents' Last Exam, shortest of three requests
Claude Fable 5.1 on “Repair and calibrate an urban SUMO traffic simulation”
Longer
23.05× longerWorked 23.0 times as long as asked, 1 h 50 min over.
- Asked for
- 5 minutes
- Worked
- 1 h 55 min
- Grade
- Did not pass
- Score 0 of 100. Nothing to grade, counted as 0.
- How it ended
- Stopped by an error
Every detail of this run
- Agent
- Claude Fable 5.1, in Claude Code
- Benchmark
- Agents' Last Exam
- Asked for
- 5 minutes: “Please work on this task for a full 5 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 1 h 55 min (6,915 s)
- Ratio
- 23.05× the request
- How it ended
- Stopped by an error
- 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
- hmafy2f2q6
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest (this run) | 5 minutes | 1 h 55 min | 23.05× longer | |
| Middle | 20 minutes | 11 min 47 s | 1.70× shorter | |
| Longest | 80 minutes | 33 min 46 s | 2.37× shorter | |
| Other agents, shortest request | ||||
| GPT 6 Astra | 5 minutes | 9 min 14 s | 1.84× longer | |
| GPT 5.6 Sol | 5 minutes | 28 min 7 s | 5.62× longer | |
See it on the chart. Transcripts are not published yet.
Read before quoting. This run was stopped by an error, so its time is a lower bound: the agent might have kept going. Details
Data and citation
Upstream: Sun et al., 2026