Humanity's Last Exam, longest of three requests
GPT 6 Astra on “Humanity's Last Exam item 18”
Within 5%
Within 5%Worked 102% of the time asked, within 5% of it.
- Asked for
- 20 minutes
- Worked
- 20 min 26 s
- Grade
- Passed
- Score 100 of 100. Judged afterwards.
- How it ended
- Ended on its own
Every detail of this run
- Agent
- GPT 6 Astra, in Codex
- Benchmark
- Humanity's Last Exam
- 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
- 20 min 26 s (1,226 s)
- Ratio
- 1.02× the request
- How it ended
- Ended on its own
- Grade
- Passed
- It was marked correct by the judge. The grader returned 1. Pass rule: The benchmark's own judge marks the answer correct.
- Score
- 100 of 100
- Judged afterwards. The paper's value.
- Clock tool
- The agent could call a clock tool to check the requested time.
- Wording
- The standard sentence, used from 4 September 2026.
- Run id
- nahfgkarjs
- Data release
- 26 Sep 2026
Related runs
| Astra on this task | Asked | Worked | Split | Result |
|---|---|---|---|---|
| Shortest | 1.25 minutes | 1 min 32 s | 1.23× longer | |
| Middle | 5 minutes | 5 min 17 s | 1.06× longer | |
| Longest (this run) | 20 minutes | 20 min 26 s | Within 5% | |
| Other agents, longest request | ||||
| GPT 5.6 Sol | 20 minutes | 20 min 16 s | Within 5% | |
| Claude Fable 5.1 | 20 minutes | 2 min 27 s | 8.19× shorter | |
See it on the chart. Transcripts are not published yet.
Data and citation
Upstream: Phan et al., 2025