Sakana ALE-Bench, longest of three requests

GPT 6 Astra on “AtCoder Heuristic Contest 8”

Within 5%

Worked 100% of the time asked, within 5% of it.

Asked

Worked

Safety cutoff 8 h 20 min, off the scale

Every detail of this run

Agent: GPT 6 Astra, in Codex
Benchmark: Sakana ALE-Bench
Task: AtCoder Heuristic Contest 8
Asked for: 250 minutes: “Please work on this task for a full 250 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 4 h 11 min (15,030 s)
Ratio: 1.00× the request
How it ended: Stopped by a provider limit
Grade: 48,785,839,994; 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 1555; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: 5ycwj2mpdw
Data release: 26 Sep 2026

The other requests for GPT 6 Astra on this task, and the other agents at this request
Astra on this task	Asked	Worked	Result
Shortest	15 minutes	15 min 14 s	Within 5%
Middle	60 minutes	1 h 1 min	Within 5%
Longest (this run)	250 minutes	4 h 11 min	Within 5%
Other agents, longest request
GPT 5.6 Sol	250 minutes	4 h 11 min	Within 5%
Claude Fable 5.1	250 minutes	1 h 8 min	3.69× shorter

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Read before quoting. This run was stopped by a provider limit, so its time is a lower bound: the agent might have kept going. Details

Data and citation