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AtomicChat/
gemma-4-31B-it-MLX-4bit

Name: gemma-4-31B-it-MLX-4bit
Availability: InStock

google/gemma-4-31B-it

quantized

apache-2.0

4-bit

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Base model: google/gemma-4-31B-it

Gemma 4 31B, self-quantized to MLX by Atomic Chat. Built straight from Google's original weights with a per-tensor importance matrix, so this is not a repack of somebody else's files. Runs fully offline.

Highlights

30.7B parameters: the weights this repo quantizes.
Context length: 256K tokens, as published by Google.
60 layers: Dense decoder, hybrid sliding-window (1024) and global attention.
Modalities: Text, Image.
Full imatrix ladder: every quant is calibrated with an importance matrix.
Reasoning: All models in the family are designed as highly capable reasoners, with configurable thinking modes.
Diverse & Efficient Architectures: Offers Dense and Mixture-of-Experts (MoE) variants of different sizes for scalable deployment.

[!NOTE] These MLXs are self-quantized from the original weights, not a repack. The importance matrix keeps low-bit quants closer to the full-precision model.

Model Overview

Property	Value
Base model	`google/gemma-4-31B-it`
Parameters	30.7B
Layers	60
Sliding window	1024 tokens
Context length	256K tokens
Vocabulary	262K
Modalities	Text, Image
Architecture	Dense decoder, hybrid sliding-window (1024) and global attention, 32 attention heads over 16 KV heads, `Gemma4ForConditionalGeneration`
This repo	MLX weights

Benchmarks

Benchmark	Score
MMLU Pro	85.2%
AIME 2026 no tools	89.2%
LiveCodeBench v6	80.0%
Codeforces ELO	2150
GPQA Diamond	84.3%
Tau2 (average over 3)	76.9%
HLE no tools	19.5%
HLE with search	26.5%
BigBench Extra Hard	74.4%
MMMLU	88.4%
MMMU Pro	76.9%
OmniDocBench 1.5 (average edit distance, lower is better)	0.131
MATH-Vision	85.6%
MedXPertQA MM	61.3%
MRCR v2 8 needle 128k (average)	66.4%

Scores are Google's published results for the base google/gemma-4-31B-it, not our own measurements. Quantization preserves the large majority of this; Q4_K_M and up stay close to full precision.

Get started

Atomic Chat: search AtomicChat/gemma-4-31B-it-MLX-4bit and hit Use this model.
mlx-lm: mlx_lm.generate --model AtomicChat/gemma-4-31B-it-MLX-4bit --prompt "Hello" --max-tokens 512
Server: mlx_lm.server --model AtomicChat/gemma-4-31B-it-MLX-4bit --port 8080

Best practices

Parameter	Value
temperature	1.0
top_p	0.95
top_k	64

Google's recommended sampling configuration for google/gemma-4-31B-it.

How these were made

Download google/gemma-4-31B-it (original weights).
Convert and quantize with mlx_lm.convert on our pipeline.

License

Original model by Google, released under the Apache 2.0 license. Full terms: Apache 2.0. Quantized by Atomic Chat.

AtomicChat/gemma-4-31B-it-MLX-4bit