Can I Run Bonsai 27B on MacBook Pro 14" (M4 Pro, 24 GB)?
Written by Jakub Rusinowski · Last updated July 15, 2026
Yes
Yes — 1-bit Bonsai 27B at Q3_K_M needs about 14.1 GB of the 18 GB usable on MacBook Pro 14" (M4 Pro, 24 GB) (~3.9 GB spare), at ~11.7 tok/s (estimated), with room for about 16,384 tokens of context.
Confidence: medium · Recommended quantization: Q3_K_M · Estimated speed: ~11.7 tok/s
MacBook Pro 14" (M4 Pro, 24 GB) — what it gives a model
| Usable memory for models | 18 GB |
| Memory bandwidth | 273 GB/s |
| Form factor | Laptop |
| Operating system | macOS |
| Memory upgradeable | No — soldered |
| Price | $1,999 (lib/data/laptops.ts (street price), checked 2026-07-06) |
Bonsai 27B on MacBook Pro 14" (M4 Pro, 24 GB): memory by quantization
| Quant | Memory needed | Fits 18 GB? | Max context | Est. speed | Download |
|---|
| F16 | 56.5 GB | ✗ No | — | — | 54 GB |
| Q8_0 | 31.2 GB | ✗ No | — | — | 28.7 GB |
| Q6_K | 24.7 GB | ✗ No | — | — | 22.1 GB |
| Q5_K_M | 21.7 GB | ✗ No | — | — | 19.1 GB |
| Q4_K_M | 18.8 GB | ✗ No | — | — | 16.3 GB |
| Q3_K_M | 14.1 GB | ✓ Yes | 16K | ~11.7 tok/s | 11.5 GB |
| Q2_K | 11.4 GB | ✓ Yes | 32K | ~14.7 tok/s | 8.9 GB |
Which Bonsai 27B sizes fit
| Variant | Needs at Q4_K_M | Fits? | Est. speed |
|---|
| 1-bit Bonsai 27B | 18.8 GB | ✗ Too large | — |
| Ternary Bonsai 27B | 18.8 GB | ✗ Too large | — |
What to watch out for
- Q3_K_M is the only quantization that fits, and it is a heavily degraded one — expect noticeably worse output than the same model at Q4_K_M. A smaller model at Q4 is usually the better trade.
- 2 larger variants of Bonsai 27B do not fit and would need CPU offload or different hardware.
- This model does not publish its full attention configuration, so the KV-cache share of these figures is inferred from its parameter count rather than computed exactly.
- Memory on this machine is not upgradeable, so the configuration you buy is the ceiling for every model you will ever run on it.
MacBook Pro M4 Pro 24 GB limitations
- Unified memory is soldered and cannot be upgraded after purchase.
- 24 GB is the practical ceiling for a single mid-size model plus a long context.
Recommended setup
Ollama or LM Studio (Metal) — MLX for the fastest Apple-native throughput
How these numbers are calculated
- Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
- 24 GB unified memory at 273 GB/s, shared between CPU and GPU.
- macOS reserves a share of unified memory for the system, so not all of it is available to a model.
- Throughput is a memory-bandwidth roofline estimate, not a measurement. It is labelled "estimated" everywhere it appears.
- KV cache is inferred from the parameter count because this model does not publish its full attention configuration.
FAQ
Can I run Bonsai 27B on MacBook Pro 14" (M4 Pro, 24 GB)?
Yes — 1-bit Bonsai 27B at Q3_K_M needs about 14.1 GB of the 18 GB usable on MacBook Pro 14" (M4 Pro, 24 GB) (~3.9 GB spare), at ~11.7 tok/s (estimated), with room for about 16,384 tokens of context.
Which quantization of Bonsai 27B should I use on MacBook Pro 14" (M4 Pro, 24 GB)?
Q3_K_M — it needs about 14.1 GB of the 18 GB available, downloads as roughly 11.5 GB, and runs at an estimated 11.7 tokens/sec with up to 16K of context.
What limits Bonsai 27B on MacBook Pro 14" (M4 Pro, 24 GB)?
Nothing binding — the model fits with headroom and generates at a usable speed on this hardware.
Which runtime should I use?
Ollama or LM Studio (Metal) — MLX for the fastest Apple-native throughput
Other Computers
Other Models on MacBook Pro 14" (M4 Pro, 24 GB)
Bonsai 27B on GPUs
What This Model Is Good At
Model & Tools
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