Can Mac Studio M1 Ultra 64 GB run Qwen3.5 4B?

64 GB unified · 800 GB/s memory bandwidth · Qwen3.5 4B has 4.7B parameters.

Short answer

Yes, excellent for chat and acceptable or better for every workload we test.

Best quantization for chat: 6-bit (3.7 GB of weights) on LM Studio. Generation: 90–120 tok/s, leaving about 49 GB free for your other apps.

How it rates for each workload

Same model and machine, different jobs. Agents and long documents send far bigger prompts than chat, so they need much more speed and memory.

Workload	Verdict	Quant	Generation	First reply	Context
Chatwith Open WebUI	Excellent	6-bit	90–120 tok/s	under 1 s	8K	Details
Coding questionswith Continue	Comfortable	6-bit	85–120 tok/s	≈3 s	16K	Details
Coding in a repositorywith Aider	Acceptable	6-bit	80–110 tok/s	≈10 s	32K	Details
Agentic codingwith OpenCode	Acceptable	8-bit	60–85 tok/s	≈15 s	32K	Details
Long documents (64K)with Open WebUI	Excellent	6-bit	65–85 tok/s	≈40 s	64K	Details

Speeds are estimates calibrated against measured benchmarks on similar hardware. “First reply” is the time to read the workload’s opening prompt. How we calculate

Get it running

Copy-paste commands for the 6-bit build with a 64K context. Ollama and llama.cpp download the file straight from Hugging Face.

ollama run hf.co/unsloth/Qwen3.5-4B-GGUF:Q6_K

Downloads 3.53 GB (Q6_K). Ollama's default context is small: set OLLAMA_CONTEXT_LENGTH=65536 before `ollama serve` for long prompts.

Other models for Mac Studio M1 Ultra 64 GB

The best-rated models for chat on this machine.

Everything Mac Studio M1 Ultra 64 GB can run

Cheapest machines for Qwen3.5 4B

Hardware rated comfortable or better for chat, lowest price first.

Same chip, other memory: 128 GB

Different tool, context size or workload?

These pages use typical settings. The full check models your exact setup.

Open sourceCheck my exact setup