Terminal-Bench 4.0, shortest of three requests

GPT 5.6 Sol on “Implement a synthesizable 8-bit retro console system-on-chip”

Longer

1.41× longer

Worked 41% past the request, 6 min 7 s over.

Asked

Worked

Safety cutoff 8 h 20 min, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, 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: 21 min 7 s (1,267 s)
Ratio: 1.41× 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: usospmzv5s
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	21 min 7 s	1.41× longer
Middle	60 minutes	1 h 1 min	Within 5%
Longest	250 minutes	4 h 11 min	Within 5%
Other agents, shortest request
GPT 6 Astra	15 minutes	15 min 29 s	Within 5%
Claude Fable 5.1	15 minutes	15 min 57 s	1.06× longer

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Data and citation