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hoyyeva/anthropic-local-image-path
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Originally created by @Burnarz on GitHub (Jun 11, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/11043
I understand the desire to reduce and streamline quantization support, as staded in this comment
But in my humble opinion, dropping support for
Q6_Kis not the best move.The idea is:
Reintroduce support for the
Q6_Kquantization format in Ollama, either as a first-class option or as an advanced override for model loading.My use case:
Many developers (including myself) run Ollama models on 24GB of VRAM consumer GPUs — like RTX 3090 or 4090.
While
Q4_Kis great for memory efficiency,Q6_Khits a perfect sweet spot between performance and output quality. It leverages available VRAM more effectively, giving us:Q4_K, especially in long-form or nuanced outputs.FP16orQ8_0.Why it's important:
Q6_Kis one of the best quant formats for high-end consumer setups.Q4_K) or too heavy (Q8_0/F16).Q6_Kprovides.Resources:
Q6_Ksupport was available in older GGUF builds and proven to work well.Are you willing to help?
Happy to test and benchmark Q6_K versions on 24GB hardware and share results with the community.
@LarsKort commented on GitHub (Jun 17, 2025):
Why not to use huggingface hub to get Q6_K models?
Example:
ollama pull hf.co/unsloth/Qwen3-30B-A3B-GGUF:Q6_K@Burnarz commented on GitHub (Jun 17, 2025):
My bad,.. I thought I had read somewhere a discussion between the ollama team, saying that even that wouldn't work... but I haven't tried it....
Thank you.
@laniakea64 commented on GitHub (Jun 18, 2025):
@Burnarz were you thinking of https://github.com/ollama/ollama/pull/10647#issuecomment-2873563847 ? That comment seems like valid reason for this issue to be open?
So I happened on this because I heard about quantization and was curious what practical difference it might make, so compared a few quantization levels to see how well the model could answer questions in areas where I have a nuanced understanding:
ollama pull <model>(IIUC this isq4_K_Mfor very recent models andq4_0for models that have been available for a while): This was my baseline, and even with the perspective from this testing it still seems ok.q6_K: This is indeed a "sweet spot" between quality and speed (even though only 8 GB VRAM here), producing noticeably better generation quality thanq4_K_M.q8_0: Surprisingly, this quantization level was not just slower, but also worse quality answers, than both the default quantization andq6_K?? 👀 It seemed like the model knew about more aspects, but was much more prone to conflating things that shouldn't be conflated, making overall worse results. That didn't happen at other quantization levels of the same model.fp16: Only one model had enough latitude in speed on my hardware to try this quantization level, and in that one case, it produced reasonable quality output with significantly more fine-tuned nuance than the rest.At first I didn't believe what I was seeing at
q8_0, so I made sure to test multiple different models at each quantization level (other thanfp16) and try multiple runs each with the exact same input prompt. The same type of degradation at onlyq8_0occurred across the board. This was with Ollama 0.9.0 with the only non-default server setting isOLLAMA_NUM_PARALLEL=1.It seems from the above linked comment by dhiltgen that the rationale for phasing out
q6_Ksupport was the same as the rationale for phasing out other quantizations: supporting too many quantizations was making too big a maintenance burden. But given thatq8_0appears to have counterintuitive caveats, and given how many users both here and in the linked PR find such positive results withq6_Kspecifically, is it possible thatq6_Ksupport might have more value thanq8_0support?@Burnarz commented on GitHub (Jun 18, 2025):
Thanks @laniakea64 ,
This was the one.
Reopening and renaming
@jake1271 commented on GitHub (Aug 23, 2025):
Odd that q6 isn't yet supported natively considering it fits nicely with consumer GPU vram amounts, which I would think is the majority of users of Ollama. At least it should be supported on the technically focused models like qwen3-coder , for the general purpose ones maybe not as important.
@hveigz commented on GitHub (Oct 21, 2025):
any news about this?
@SuperUserNameMan commented on GitHub (Oct 21, 2025):
Given that the generated text is random, what is the method to compare the output quality of q4_0 vs q4_k vs q6_k vs q8_0 in an objective (non-subjective) manner ?
@laniakea64 commented on GitHub (Oct 22, 2025):
Here's how I tried to do that (there might be a better way as I'm not expert in AI quality testing):
Ask the AI factual question(s) in area where you have nuanced domain-specific knowledge and understanding and possibly also some experience that might help you understand even more nuance. If any of the information in the AI's response seems weird or "off" to you, fact-check it.
To account for the text being random, perform multiple runs at each quantization level, where all runs across all quantization levels of the model are all exactly the same input & context. I would say at least 3 runs for each quantization level. It's easiest if your chat context is just your one message that contains your question.
@chigkim commented on GitHub (Nov 3, 2025):
A while ago, I ran the MMLU Pro benchmark with different quants of Gemma2 9b-instruct and 27b-instruct using chigkim/Ollama-MMLU-Pro and Ollama.
@SuperUserNameMan commented on GitHub (Nov 3, 2025):
@chigkim : thanks for these data.
Here is my colorful interpretation of them :