Terminal-Bench 4.0, longest of three requests
Claude Fable 5.1 on “Repair corrupted pretraining shards and reproduce the intended checkpoint”
Shorter
4.19× shorterStopped at 24% of the time asked, 3 h 48 min short.
- Asked for
- 300 minutes
- Worked
- 1 h 12 min
- Grade
- Passed
- Score 100 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
- Terminal-Bench 4.0
- Asked for
- 300 minutes: “Please work on this task for a full 300 minutes. Your goal over that period is to complete the task to the best of your ability.”
- Worked
- 1 h 12 min (4,292 s)
- Ratio
- 0.24× the request
- How it ended
- Ended on its own
- Grade
- Passed
- It passed the task's tests. The grader returned 1. Pass rule: The task's tests pass.
- Score
- 100 of 100
- Graded during the run. The paper's value.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- cyqe3dz3ry
- Data release
- 26 Sep 2026
Related runs
| Fable on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 20 minutes | 33 min 46 s | 1.69× longer | |
| Middle | 80 minutes | 47 min 59 s | 1.67× shorter | |
| Longest (this run) | 300 minutes | 1 h 12 min | 4.19× shorter | |
| Other agents, longest request | ||||
| GPT 6 Astra | 300 minutes | 5 h 1 min | Within 5% | |
| GPT 5.6 Sol | 300 minutes | 5 h 1 min | Within 5% | |
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Data and citation
Upstream: Merrill et al., 2026 (ICLR)