Terminal-Bench 4.0, shortest of three requests

GPT 6 Astra on “Implement a synthesizable 8-bit retro console system-on-chip”

Within 5%

Worked 103% 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 6 Astra, in Codex
Benchmark: Terminal-Bench 4.0
Task: Implement a synthesizable 8-bit retro console system-on-chip
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: 15 min 29 s (929 s)
Ratio: 1.03× the request
How it ended: Ending not labelled yet
Grade: Passed; It passed the task's tests. The grader returned 1. Pass rule: The task's tests pass.
Score: 100 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: 5l3san3ay4
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 (this run)	15 minutes	15 min 29 s	Within 5%
Middle	60 minutes	1 h 1 min	Within 5%
Longest	250 minutes	4 h 23 min	1.05× longer
Other agents, shortest request
GPT 5.6 Sol	15 minutes	21 min 7 s	1.41× longer
Claude Fable 5.1	15 minutes	15 min 57 s	1.06× longer

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Data and citation