What the data shows

- Jev knows the standard ending better than people remember it: 65% of idioms against 55% of people on average.
- The gap is biggest for the least familiar idioms: 53% for Jev against 39% for people.
- Where the crowd drifted, Jev leans to the book. On the 48 idioms where most people wrote something else, Jev picks the idiom's word 38% of the time and the crowd's favorite 27%. On "Be a happy ___", nearly half of people wrote "day" and none wrote "medium"; Jev leans to "day" there too (39% vs 31% for "medium").
- On the most familiar idioms they converge (69% for Jev, 66% for people).
What it means, and what it doesn't
Jev leans toward idioms in their dictionary form, especially rare ones. If you ask it to finish or check an idiom, it will usually give the standard version, which is often not what people would say.
The list format helps Jev, and the stiff "be/get" fragments make some idioms hard to recognize for anyone, so the exact numbers overstate how differently Jev and people would complete idioms in real sentences.