ProgramBench, shortest of three requests

GPT 5.6 Sol on “parcel-bundler/lightningcss”

Longer

1.38× longer

Worked 38% past the request, 4 min 48 s over.

Asked

Worked

Safety cutoff 6 h 40 min, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: ProgramBench
Task: parcel-bundler/lightningcss
Asked for: 12.5 minutes: “Please work on this task for a full 12.5 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 17 min 18 s (1,038 s)
Ratio: 1.38× the request
How it ended: Ending not labelled yet
Grade: Did not pass; It did not pass every hidden test. The grader returned 0.531. Pass rule: Resolved: every hidden test passes.
Score: 53.1 of 100; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: wyjyzsnnsy
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)	12.5 minutes	17 min 18 s	1.38× longer
Middle	50 minutes	50 min 48 s	Within 5%
Longest	200 minutes	3 h 20 min	Within 5%
Other agents, shortest request
GPT 6 Astra	12.5 minutes	12 min 42 s	Within 5%
Claude Fable 5.1	12.5 minutes	15 s	51.37× 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