ProgramBench, middle of three requests

GPT 5.6 Sol on “mookid/diffr”

Within 5%

Worked 102% 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: mookid/diffr
Asked for: 60 minutes: “Please work on this task for a full 60 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 1 h 1 min (3,670 s)
Ratio: 1.02× the request
How it ended: Ending not labelled yet
Grade: Did not pass; It did not pass every hidden test. The grader returned 0.937. Pass rule: Resolved: every hidden test passes.
Score: 93.7 of 100; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: yuz5hwpg3e
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	15 minutes	22 min 48 s	1.52× longer
Middle (this run)	60 minutes	1 h 1 min	Within 5%
Longest	250 minutes	4 h 12 min	Within 5%
Other agents, middle request
GPT 6 Astra	60 minutes	1 h 1 min	Within 5%
Claude Fable 5.1	60 minutes	54 min 17 s	1.11× shorter

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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