While all these models are nondeterministic a feature bump is still necessary as the same input can have wildly different output on a new model. For API users being able to pin a model is a necessity.
replyAll the 4.x models are still available, and they all cost the same.
reply> Opus 4.7 and later use a new tokenizer compared to previous models, contributing to their improved performance on a wide range of tasks. This new tokenizer may use up to 35% more tokens for the same fixed text.
replySame cost/token, more token usage.