Unsloth's collection as well [0], with their results [1]. Looks like they can get very close to 100% accuracy compared to the BF16 model that is unquantized, and Unsloth's quants are better than the original Google's QAT as posted in the article.

Personal I'm using the 2B model for web search and structured JSON output back via Unsloth Studio and its API, works very well for that even with the model embedded on phones.

[0] https://huggingface.co/collections/unsloth/gemma-4-qat

[1] https://unsloth.ai/docs/models/gemma-4/qat#qat-analysis

• llmoorator

  today at 5:49 PM

  you misunderstand what that chart shows - it shows BF16 QAT Q4_0, not BF16 regular.

  meaning Google quantized the model to 4 bit and stored the result in BF16 format for compatibility and convenience to downstream packers.

  Like storing small 8 bit numbers in full 32 bit integers.

  So it's not close to 100% of unquantized BF16.

  I'm curious if anybody can explain why Google released 4 bit QAT Q4_0 is not exactly 100% of BF16 QAT Q4_0? seems like it should be just bit twiddling, no further quantization to convert between these two packings. Unsloth talks about "lattice alignment" being an issue.

  That being said I hate it that smol model makers, like Google, Qwen, ... only show the BF16 benchmarks when they release a new models, knowing that what people really run are 4-8 bit quantizations, so it's really hard to understand how much you lose when you run 4 bit vs 6 bit...

• slopinthebag

  today at 5:56 PM

  I'm confused, the unsloth model is ~600mb and the one from google is 7gb?

It's a bit awkward to release Gemma 4 12B (https://news.ycombinator.com/item?id=48385906), and then a canonical Q4_0 Gemma 4 12B a couple days later.

It's good that this post lists the expected VRAM usage for the models with Q4_0 Gemma 4 12B being 6.7GB, which will indeed fit Google's claims of fitting within 16GB comfortably, altough it confirms that only the quantized version will do so.

Relatedly, in Google's newly released Edge Gallery for macOS, Gemma 4 12B is explicitly listed as unsupported due to not enough RAM even on a 16GB machine, but given the expected VRAM usage here the Q4_0 variant definitely should fit and Google should fix that.

• Aurornis

  today at 5:32 PM

  I'm not sure why you think it's awkward to have multiple releases. It's better to release models and variations as they're ready, not withhold them all until everything is ready to release all at once.

  The Q4_0 is a quantization aware training checkpoint. It's not a simple quantization of the original Gemma 4 12B.

• netdur

  today at 5:20 PM

  not sure if I understand you, but 4Q and QAT 4Q are different

  • refulgentis

    today at 5:27 PM

    It's super annoying when you have products that utilize these because there's...4? releases in 3 weeks?

    - Gemma 4 2B/4B/27BE3B/31B

    - Gemma 4 2B/4B/27BE3B/31B x "assistant" / MTP drafter models (i.e. multitoken prediction)

    - Gemma 4 12B (2 days ago? 1?)

    - Gemma 4 QAT 2B/4B/12B/27BE3B/31B x "assistant" models (i.e. multitoken prediction)

    It probably sounds silly and really whiny in the abstract. It just causes a ton of work / confusion downstream that feels unnecessary.

    Extremely glad for the output, not glad to have to chase it.

    ex. llama.cpp currently supports the originals but not the MTP predictors but there is a patch for the MTP predictors but not for the small MoE models and I think it supports the 12B but maybe not media for it yet and now we have these too and the blog says there's GGUFs (llama.cpp models) but there isn't in any of the 12? repos I clicked through. and ~every consumer-facing local LLM app is built on llama.cpp or a fork of it.

    Also if anyone at Google is taking feedback over to b/ or product, pleaseeee stop the "E"2B "E"4B thing, unless it's actually taking up less RAM on Android during CPU inference. I can't tell if I need to treat the 4B like an 8B (i.e. beyond most consumer hardware without a GPU) or a 4B (i.e. will run on most consumer hardware since 2021)

    • ddarolfi

      today at 5:35 PM

      These models aren't products? They are open source ish (open weight I guess), research outputs. While the naming scheme may be confusing, it is relevant and important. I believe it's on you to understand it.

      • refulgentis

        today at 6:10 PM

        I understand it. :)

    • satvikpendem

      today at 5:37 PM

      Just use Unsloth Studio it supports them all.

Could these quantized models make MTP (Multi-Token Prediction) faster when used in conjunction with larger Gemma 4 models?

For a moment I got excited thinking QAT is Intel Quick Assist Technology...

had a good run with Gemma 4 E2B Unsloth 4Q: https://youtube.com/shorts/XLsAnz5aAAI

The E4B model doesn’t fit on my phone TPU, so it swaps to RAM, the QAT version means more accuracy, good!

@google.com'ers, there are no GGUFs (blog says there is)

• minimaxir

  today at 5:25 PM

  Isn’t this it? https://huggingface.co/google/gemma-4-12B-it-qat-q4_0-gguf

  • refulgentis

    today at 5:34 PM

    Ah, nice, ty! My excuse is those repos were added to the collection after my comment, but perhaps not :3

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