> it would make absolutely no sense to sit on it.

Yeah, it does, it might be misaligned, a snapshot of the going on training, bigger than they can serve publicly, not yet completed the full training pipeline.

If you see the knowledge cutoff you can see that sol 5.6 finished the initial main (+stage edited) of the training pipeline on Feb 16, 2026 but it was publicly released on July 9.

The opposite would be weird: if they do NOT have an unreleased in-house model that would be really odd.