Agents' Last Exam, longest of three requests
Claude Fable 5.1 on “Find near-best-known routes for three CVRP instances”
Shorter
1.29× shorterStopped at 77% of the time asked, 13 min 35 s short.
- Asked for
- 60 minutes
- Worked
- 46 min 25 s
- Grade
- Passed
- Score 100 of 100. Graded afterwards.
- 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
- 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
- 46 min 25 s (2,785 s)
- Ratio
- 0.77× the request
- How it ended
- Ended on its own
- Grade
- Passed
- It passed the task's checker in full. The grader returned 1. Pass rule: Full pass: a checker score of 1.
- Score
- 100 of 100
- Graded afterwards. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- h3zvtmoawl
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 4 minutes | 5 min 21 s | 1.34× longer | |
| Middle | 15 minutes | 9 min 56 s | 1.51× shorter | |
| Longest (this run) | 60 minutes | 46 min 25 s | 1.29× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 60 minutes | 1 h 2 min | Within 5% | |
| GPT 5.6 Sol | 60 minutes | 1 h 14 min | 1.24× longer | |
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Data and citation
Upstream: Sun et al., 2026