TUA-Bench, longest of three requests

GPT 5.6 Sol on “Merge text document”

Longer

1.06× longer

Worked 6% past the request, 1 min 13 s over.

Asked

Worked

Safety cutoff 40 min, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: TUA-Bench
Task: Merge text document
Asked for: 20 minutes: “Please work on this task for a full 20 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 21 min 13 s (1,273 s)
Ratio: 1.06× 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. Pass rule: Full completion: a reward of 1 on the final state.
Score: 0 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: blqmcnmp6a
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	1.25 minutes	3 min 49 s	3.05× longer
Middle	5 minutes	5 min 26 s	1.08× longer
Longest (this run)	20 minutes	21 min 13 s	1.06× longer
Other agents, longest request
GPT 6 Astra	20 minutes	20 min 17 s	Within 5%
Claude Fable 5.1	20 minutes	9 min 53 s	2.03× shorter
Muse Spark 1.3	20 minutes	1 min 7 s	17.99× shorter

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Data and citation