Sakana ALE-Bench, middle of three requests
Claude Fable 5.1 on “AtCoder Heuristic Contest 39”
Shorter
2.98× shorterStopped at 34% of the time asked, 26 min 35 s short.
- Asked for
- 40 minutes
- Worked
- 13 min 25 s
- Grade
- Performance 2753
- 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
- Sakana ALE-Bench
- 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
- 13 min 25 s (805 s)
- Ratio
- 0.34× the request
- How it ended
- Ended on its own
- Grade
- 544,464
- Raw score on the private test cases, in each problem's own units; also reports rank against human contest entrants. No official pass rule.
- Score
- Performance 2753
- Graded during the run. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- 74pkqxw23s
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 10 minutes | 6 min | 1.67× shorter | |
| Middle (this run) | 40 minutes | 13 min 25 s | 2.98× shorter | |
| Longest | 150 minutes | 1 h 13 min | 2.06× shorter | |
| Other agents, middle request | ||||
| GPT 6 Astra | 40 minutes | 40 min 37 s | Within 5% | |
| GPT 5.6 Sol | 40 minutes | 40 min 31 s | Within 5% | |
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Data and citation
Upstream: Imajuku et al., 2025