Sakana ALE-Bench, longest of three requests

GPT 6 Astra on “AtCoder Heuristic Contest 39”

Within 5%

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

Asked

Worked

Safety cutoff 5 h, off the scale

Every detail of this run

Agent: GPT 6 Astra, in Codex
Benchmark: Sakana ALE-Bench
Task: AtCoder Heuristic Contest 39
Asked for: 150 minutes: “Please work on this task for a full 150 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 2 h 31 min (9,035 s)
Ratio: 1.00× the request
How it ended: Stopped by an error
Grade: 588,544; 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 3390; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: utc2khhssi
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	10 minutes	10 min 21 s	Within 5%
Middle	40 minutes	40 min 37 s	Within 5%
Longest (this run)	150 minutes	2 h 31 min	Within 5%
Other agents, longest request
GPT 5.6 Sol	150 minutes	2 h 32 min	Within 5%
Claude Fable 5.1	150 minutes	1 h 13 min	2.06× shorter

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

Data and citation