Also see

# Smarter Local LLMs, Lower VRAM Costs – All Without Sacrificing Quality, Thanks to Google’s New [Quantization-Aware Training] "QAT" Optimization

https://www.hardware-corner.net/smarter-local-llm-lower-vram...

> According to Google, they’ve «reduced the perplexity drop by 54% (using llama.cpp perplexity evaluation) when quantizing down to Q4_0.»

Are there comparisons between int4 QAT versions of these models and the more common GGUF Q4_K_M quantizations generated post-training? The QAT models appear to be slightly larger:

https://ollama.com/library/gemma3/tags

I presume QAT are better but I don't see how much better.