In my own experience, 2.5 Pro 03-26 was by far the best LLM model at the time.

The newer models are quantized and distilled (I confirmed this with someone who works on the team), and are a significantly worse experience. I prefer OpenAI O3 and o4-mini models to Gemini 2.5 Pro for general knowledge tasks, and Sonnet 4 for coding.

For coding in my experience Claude Sonnet/Opus 4.0 is hands down better than Gemini 2.5. pro. I just end up fighting with Claude a lot less than I do with Gemini. I had Gemini start a project that involved creating a recursive descent parser for a language in C. It was full of segfaults. I'd ask Gemini to fix them and it would end up breaking something else and then we'd get into a loop. Finally I had Claude Sonnet 4.0 take a look at the code that Gemini had created. It fixed the segfaults in short order and was off adding new features - even anticipating features that I'd be asking for.

If I'm being cynical, it's easy to either say "we use it" or "we don't touch it" but they'd lose everyone that cares about this question if they just said "we use it" - most beneficial position is to keep it as murky as possible.

If I were you I'd assume they're using all of it for everything forever and act accordingly.