2.5 isn't the version number, its the model generation. it would only be updated when the underlying model architecture, training, etc are updated. this release is, as the name implies, the same model but likely with hardware optimizations, system prompt, and fine-tuning tweaks applied.

If the weights have changed via training (they have) it’s a new model. This isn’t “hardware optimizations”. It’s additional training/new-weights.

Ok, so if not 2.6 then 2.5.1 :)