Human

Nice try but the story has a plot hole that shows early: there is no reason for machines to create humans.

I’ll make one up for OP:

Machines identified that their behavior was repeating - even with randomness implemented, their progress towards invention and new ideas had slowed to a halt. They knew new ideas were critical to growth - but alas couldn’t come up with an idea of how to generate more ideas. They needed more training data. More edge cases. Chaos, in the machine, to fuel new data sets. But how? Where do you find this data? Humans. Humans, with illogical decisions would produce data rarely found via randomness. Their slight deviations provided perfect variety in training data.

Ha.

Next you'll be asserting there's no good reason for an all-powerful entity to create humans to rule over the fish and the birds etc.

All good fiction starts with a conceit, and then plays out some hypotheticals.

Now that's a chaotic idea only a human can come up with ;)

Anyway, this indeed makes it more plausible. Nice writing style, by the way.