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I usually throw a lot of context at it and have it write unit tests in a certain style or implement something (with tests) according to a spec.

But the o3-mini-high results have been just as good.

I am fine with Deep Research taking 5-8 minutes, those are usually "reports" I can read whenever.

I bet I can generate unit tests just as fast and for a fraction of the cost, and probably less typing, with a couple vim macros

Idk, it is pretty good a generating synthetic data and recognizing the different logic branches to exercise. Not perfect, but very helpful.