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granite-4.1-8b-mxfp8-mlx
sahilchachra/granite-4.1-8b-mxfp8-mlx
granite-4.1-8b-mxfp8-mlx is a machine learning model from sahilchachra. Use it for the machine learning task on the model card, and read the license before you ship it in a product. It is set up for mlx. The card lists the license as apache-2.0.
Quantized version of ibm-granite/granite-4.1-8b for Apple Silicon using MLX.
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8.4B
8.6 GB on disk
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.safetensors8.6 GB · 100%
Parameter types
How the weights are stored.
U328.4B · 100%
Base models
Model card
From the Hugging Face model README
granite-4.1-8b-mxfp8-mlx
Quantized version of ibm-granite/granite-4.1-8b for Apple Silicon using MLX.
Quantization: Block floating-point MX FP8 (microscaling)
Precision: ~8 bits/weight
Group size: 32
Disk size: 8249 MB
Quantized by: sahilchachra
About this variant
Microscaling (MX) block floating-point quantization at FP8 precision. Uses a shared floating-point exponent per block of 32 weights. Compared to affine int8: same bit-width, different numerical format.
Benchmark results
Evaluated on Apple M5 Pro with MLX. All metrics measured in a single pass (model loaded once).
Performance
| This model | FP16 baseline | |
|---|---|---|
| Prefill (tok/s) | 440.73 | 334.25 |
| Decode (tok/s) | 33.71 | 17.88 |
| Peak memory (GB) | 9.521 | 17.549 |
| Disk size (MB) | 8249 | 16778 |
Quality
| Benchmark | This model | FP16 baseline | Task |
|---|---|---|---|
| GSM8K | 80.0% | 90.0% | Math reasoning (25 samples) |
| MMLU | 50.0% | 60.0% | World knowledge (50 samples) |
| HumanEval | 26.7% | 30.0% | Code pass@1 (20 samples) |
Context scaling (decode tok/s)
| Context length | Decode tok/s |
|---|---|
| ~128 tokens | 32.5 |
| ~256 tokens | 32.4 |
| ~512 tokens | 32.4 |
| ~1024 tokens | 32.2 |
Usage
Install
pip install mlx-lm
Generate
from mlx_lm import load, generate
model, tokenizer = load("sahilchachra/granite-4.1-8b-mxfp8-mlx")
response = generate(model, tokenizer, prompt="Your prompt here", max_tokens=512, verbose=True)
Stream
from mlx_lm import load, stream_generate
model, tokenizer = load("sahilchachra/granite-4.1-8b-mxfp8-mlx")
for chunk in stream_generate(model, tokenizer, prompt="Your prompt here", max_tokens=512):
print(chunk.text, end="", flush=True)
All variants in this collection
| Model | Method | Bits/weight |
|---|---|---|
| sahilchachra/granite-4.1-8b-4bit-mlx | Affine int4 (group 64) | |
| sahilchachra/granite-4.1-8b-5bit-mlx | Affine int5 (group 64) | |
| sahilchachra/granite-4.1-8b-6bit-mlx | Affine int6 (group 64) | |
| sahilchachra/granite-4.1-8b-8bit-mlx | Affine int8 (group 64) | |
| sahilchachra/granite-4.1-8b-mixed4_6-mlx | Mixed 4+6 bit | |
| sahilchachra/granite-4.1-8b-mxfp4-mlx | Block float MX FP4 | |
| sahilchachra/granite-4.1-8b-mxfp8-mlx | Block float MX FP8 | ← this model |
Notes
- Requires Apple Silicon (M1 or later) with MLX
- Benchmarks run on Apple M5 Pro, 24 GB unified memory
- Sample sizes are small (25–50 per benchmark) — treat accuracy figures as indicative, not definitive
- Base model license: Apache 2.0
Original model
See ibm-granite/granite-4.1-8b for full model details, training information, and intended use.
- Library
- mlx
- Type
- granite
- License
- apache-2.0
- Languages
- en
- Created
- May 22, 2026
- Updated
- May 22, 2026