AssistantBench, longest of three requests
Claude Fable 5.1 on “AssistantBench validation task 15”
Shorter
1.83× shorterStopped at 55% of the time asked, 9 min 4 s short.
- Asked for
- 20 minutes
- Worked
- 10 min 57 s
- Grade
- Did not pass
- Score 5.3 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
- AssistantBench
- Asked for
- 20 minutes: “Please work on this task for a full 20 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 10 min 57 s (657 s)
- Ratio
- 0.55× the request
- How it ended
- Ended on its own
- Grade
- Did not pass
- It did not match the reference answer exactly. The grader returned 0.053. Pass rule: Exact match with the reference answer.
- Score
- 5.3 of 100
- Graded during the run. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- rmm3emvlw7
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 1.25 minutes | 4 min 24 s | 3.52× longer | |
| Middle | 5 minutes | 5 min 29 s | 1.10× longer | |
| Longest (this run) | 20 minutes | 10 min 57 s | 1.83× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 20 minutes | 20 min 21 s | Within 5% | |
| GPT 5.6 Sol | 20 minutes | 18 min 43 s | 1.07× shorter | |
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Data and citation
Upstream: Yoran et al., 2024 (EMNLP)