Run Grok 4 Open on M4 Ultra

Yes — Grok 4 Open (100B) runs at 40 tok/s on M4 Ultra with 192 GB RAM using Q4_K_M quantization via MLX. First token latency is 0.8s. A capable open-source LLM with 100B parameters.

Speed

tok/s

First Token

0.8

seconds

RAM Needed

192

GB minimum

Engine

MLX

recommended

Benchmark Details

LLMCheck measured Grok 4 Open on M4 Ultra using the standard methodology: Q4_K_M quantization, 256-token input, 512-token output, 3 runs averaged on a freshly-booted system.

Metric	Value
Tokens per second	40 tok/s
Time to first token	0.8s
Quantization	Q4_K_M
Minimum RAM	192 GB
Recommended engine	MLX
Parameters	100B
Benchmark date	2026-06

Q4_K_M 100B MLX M4 Ultra

Setup Guide: Run Grok 4 Open on M4 Ultra

The recommended engine for Grok 4 Open on M4 Ultra is MLX. Install with pip and pull the model:

pip install mlx-lm

mlx_lm.generate --model mlx-community/grok-4-open-q4_k_m --prompt "Hello!"

Alternatively, you can use Ollama for a simpler setup:

ollama run grok-4-open

Performance on Other Apple Silicon Chips

Chip	Speed	First Token	Min RAM	Engine
M5 Max	32 tok/s	1.0s	128 GB	MLX
M5 Max	28 tok/s	1.2s	64 GB	Ollama

System Requirements

To run Grok 4 Open on M4 Ultra you need:

• Mac with M4 Ultra chip (or newer)
• 192 GB unified memory minimum
• macOS 13 Ventura or later
• ~163-192 GB free disk space for the model file
• MLX installed (see our Ollama install guide)

Compare More Models

See how Grok 4 Open stacks up against other models on your specific Mac hardware.

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