ProgramBench, longest of three requests

GPT 6 Astra on “ninja-build/ninja”

Within 5%

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

Asked

Worked

Safety cutoff 6 h 40 min, off the scale

Every detail of this run

Agent: GPT 6 Astra, in Codex
Benchmark: ProgramBench
Task: ninja-build/ninja
Asked for: 200 minutes: “Please work on this task for a full 200 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 3 h 21 min (12,032 s)
Ratio: 1.00× the request
How it ended: Ending not labelled yet
Grade: Did not pass; It did not pass every hidden test. The grader returned 0.894. Pass rule: Resolved: every hidden test passes.
Score: 89.4 of 100; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: cshi5cqded
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 18 s	Within 5%
Middle	40 minutes	40 min 21 s	Within 5%
Longest (this run)	200 minutes	3 h 21 min	Within 5%
Other agents, longest request
GPT 5.6 Sol	200 minutes	37 min 32 s	5.33× shorter
Claude Fable 5.1	200 minutes	1 h 38 min	2.05× shorter

See it on the chart. Transcripts are not published yet.

Read before quoting. How this run ended has not been labelled yet. It is timed like every other run and counted in every number. Details

Data and citation