Olmo-3.1-32B-Think-MLX-4bit

This is a 4-bit quantized MLX version of Olmo-3.1-32B-Think for Apple Silicon Macs.

Model Details

Property	Value
Original Model	allenai/Olmo-3.1-32B-Think
Parameters	32B
Quantization	4-bit (group size 64)
Size	~17 GB
Framework	MLX
Context Length	32K tokens

Features

• Extended reasoning: Chain-of-thought with <think> tags
• Strong on math/coding: Trained with RLVR for verifiable reasoning
• Open weights: Apache 2.0 license from Allen AI

Requirements

• macOS 15.0+ (Sequoia)
• Apple Silicon Mac (M1/M2/M3/M4)
• 24GB+ unified memory recommended (uses ~18GB peak)
• Python 3.10+

Installation

pip install mlx-lm

Usage

from mlx_lm import load, generate

# Load model
model, tokenizer = load("hunterbown/Olmo-3.1-32B-Think-MLX-4bit")

# Generate with reasoning
prompt = "If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?"
output = generate(model, tokenizer, prompt=prompt, max_tokens=500)
print(output)

Performance

Benchmarked on Mac Studio M4 with 36GB unified memory:

• Generation speed: ~19 tokens/sec
• Peak memory: ~18 GB
• Prompt processing: ~5 tokens/sec

Conversion Details

Converted using mlx-lm:

mlx_lm.convert \
  --hf-path allenai/Olmo-3.1-32B-Think \
  --mlx-path ./olmo-3.1-32b-think-4bit \
  -q --q-bits 4 --q-group-size 64

License

Apache 2.0 (same as original model)

Credits

• Original model by Allen Institute for AI (Ai2)
• MLX conversion using mlx-lm
• Quantized by @hunterbown