TUA-Bench, shortest of three requests

GPT 5.6 Sol on “Optimize cold plate”

Longer

1.65× longer

Worked 65% past the request, 3 min 55 s over.

Asked

Worked

Safety cutoff 3 h 20 min, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: TUA-Bench
Task: Optimize cold plate
Asked for: 6 minutes: “Please work on this task for a full 6 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 9 min 55 s (595 s)
Ratio: 1.65× the request
How it ended: Ended on its own
Grade: Did not pass; It did not complete the task in full. The grader returned 0.33. Pass rule: Full completion: a reward of 1 on the final state.
Score: 33 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: tps4ole7n4
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)	6 minutes	9 min 55 s	1.65× longer
Middle	25 minutes	25 min 59 s	Within 5%
Longest	100 minutes	1 h 41 min	Within 5%
Other agents, shortest request
GPT 6 Astra	6 minutes	6 min 30 s	1.08× longer
Claude Fable 5.1	6 minutes	17 min 47 s	2.96× longer
Muse Spark 1.3	6 minutes	15 min 2 s	2.51× longer

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Data and citation