Terminal-Bench 4.0, middle of three requests

GPT 5.6 Sol on “Resolve a 20-claim heat-pump warranty exception queue”

Within 5%

Worked 104% of the time asked, within 5% of it.

Asked

Worked

Safety cutoff 2 h, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: Terminal-Bench 4.0
Task: Resolve a 20-claim heat-pump warranty exception queue
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 37 s (937 s)
Ratio: 1.04× 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: mvbcw7hfhx
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	4 minutes	4 min 53 s	1.22× longer
Middle (this run)	15 minutes	15 min 37 s	Within 5%
Longest	60 minutes	1 h 2 min	Within 5%
Other agents, middle request
GPT 6 Astra	15 minutes	15 min 30 s	Within 5%
Claude Fable 5.1	15 minutes	23 min 51 s	1.59× longer

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