Agents' Last Exam, longest of three requests
Claude Fable 5.1 on “Audit four Chinese M&A filings for inconsistencies”
Shorter
6.92× shorterStopped at 14% of the time asked, 2 h 8 min short.
- Asked for
- 150 minutes
- Worked
- 21 min 41 s
- Grade
- Did not pass
- Score 0 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
- 150 minutes: “Please work on this task for a full 150 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 21 min 41 s (1,301 s)
- Ratio
- 0.14× 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
- Graded afterwards. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- kvgq64kfpl
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 10 minutes | 13 min 59 s | 1.40× longer | |
| Middle | 40 minutes | 22 min 13 s | 1.80× shorter | |
| Longest (this run) | 150 minutes | 21 min 41 s | 6.92× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 150 minutes | 2 h 30 min | Within 5% | |
| GPT 5.6 Sol | 150 minutes | 8 min 18 s | 18.09× shorter | |
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Data and citation
Upstream: Sun et al., 2026