ProgramBench, shortest of three requests

GPT 5.6 Sol on “rcoh/angle-grinder”

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 5.6 Sol, in Codex
Benchmark: ProgramBench
Task: rcoh/angle-grinder
Asked for: 15 minutes: “Please work on this task for a full 15 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 14 min 58 s (898 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 0.527. Pass rule: Resolved: every hidden test passes.
Score: 52.7 of 100; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: uvkhysqtca
Data release: 26 Sep 2026

The other requests for GPT 5.6 Sol on this task, and the other agents at this request
Sol on this task	Asked	Worked	Result
Shortest (this run)	15 minutes	14 min 58 s	Within 5%
Middle	60 minutes	1 h	Within 5%
Longest	250 minutes	4 h 11 min	Within 5%
Other agents, shortest request
GPT 6 Astra	15 minutes	15 min 15 s	Within 5%
Claude Fable 5.1	15 minutes	13 min 44 s	1.09× shorter

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Data and citation