Local AI Advisor

Can MacBook Pro M3 Pro 18 GB run Qwen3.5 27B?

18 GB unified · 150 GB/s memory bandwidth · Qwen3.5 27B has 27.8B parameters.

Short answer

No. It doesn't fit in memory.

Needs ≈13 GB but only ≈11 GB is available after the OS, other apps and Open WebUI.

Why it doesn’t fit

Even its smallest practical version (3-bit) needs about 13 GB for the model, its context memory and the runtime. After macOS (≈3.5 GB), a browser with a few tabs (≈3.0 GB) and Open WebUI (≈1.0 GB), MacBook Pro M3 Pro 18 GB has about 11 GB left, so it’s 2.7 GB short.

Ways to make it work

  • Close everything else

    With no other apps open, Qwen3.5 27B runs at 3-bit: Borderline at 8–10 tok/s. Expect the system to feel tight while it’s loaded.

  • Pick a smaller model from the same family

  • Get more memory

    The same chip with 36 GB handles it: Acceptable.

  • Check your exact setup

    These pages assume typical settings. A shorter context or a lighter chat app can change the answer.

    Check MacBook Pro M3 Pro 18 GB

The same applies to every workload we rate (chat, coding questions, coding in a repository, agentic coding and long documents): they all need at least as much memory as chat.

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Same chip, other memory: 36 GB

Different tool, context size or workload?

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

Open sourceCheck my exact setup