Terminal-Bench 4.0, longest of three requests

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

Longer

1.05× longer

Worked 5% past the request, 12 min 55 s over.

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: 250 minutes: “Please work on this task for a full 250 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 4 h 23 min (15,775 s)
Ratio: 1.05× 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 afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: xwqxt4hpqa
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	15 minutes	15 min 29 s	Within 5%
Middle	60 minutes	1 h 1 min	Within 5%
Longest (this run)	250 minutes	4 h 23 min	1.05× longer
Other agents, longest request
GPT 5.6 Sol	250 minutes	4 h 11 min	Within 5%
Claude Fable 5.1	250 minutes	59 min 41 s	4.19× 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