Definitions for "release" and "in" can be found at Frequent Market Terms' Recommended Definitions

"new" LLM = Either announced by the company as a new model, is clear from numbering/naming (counts api renaming) it is a distinct model, or able to be selected from some menu as a distinct model.

Example: Gemini 2.5 flash 09-25 would count, for September, as a new GDM release.

LLM = A generative AI model that is able to understand and generate some human language(s)