Mistral Large 3 needs ~420.9 GB but MacBook Pro M3 Pro 18GB only has 13.0 GB. Try a smaller quantization or lighter model.
Operating mode
Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.
Current mode
Balanced
Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.
Select quantization to explore
407.9 GB over capacity — needs offload or smaller quantization
Fit status
Too heavy
Decode
2.0 tok/s
TTFT
96800 ms
Safe context
4K
Memory
420.9 GB / 13.0 GB
Offload
100%
Usable shared or unified memory is the main blocker for this model.
Not enough usable memory
The model needs 420.9 GB, but this setup only exposes 13.0 GB of usable shared or unified memory.
Move to a larger memory pool
A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | F | Too heavy | 2.0 tok/s | 52800 ms | 4K |
| Coding | F | Too heavy | 2.0 tok/s | 96800 ms | 4K |
| Agentic Coding | F | Too heavy | 2.0 tok/s | 140800 ms | 4K |
| Reasoning | F | Too heavy | 2.0 tok/s | 114400 ms | 4K |
| RAG | F | Too heavy | 2.0 tok/s | 176000 ms | 4K |
How Mistral Large 3 (675B params) fits at each quantization level on MacBook Pro M3 Pro 18GB (13.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 263.3 GB | Low | F0 |
Q3_K_S | 3 | 330.8 GB | Low | F0 |
NVFP4 | 4 |
No, Mistral Large 3 requires more memory than MacBook Pro M3 Pro 18GB provides.
Mistral Large 3 (675B parameters) requires approximately 420.9 GB of memory with Q4_K_M quantization.
The recommended quantization for Mistral Large 3 is Q4_K_M, which balances quality and memory efficiency.
On MacBook Pro M3 Pro 18GB, Mistral Large 3 achieves approximately 2.0 tokens per second decode speed with a time-to-first-token of 96800ms using Q4_K_M quantization.
For coding workloads, Mistral Large 3 on MacBook Pro M3 Pro 18GB receives a F grade with 2.0 tok/s and 4K context.
On MacBook Pro M3 Pro 18GB, Mistral Large 3 can safely use up to 4K tokens of context. The model's official context limit is 256K, but available memory constrains the safe maximum.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/mistral-large-3-675b-a41b-on-m3-pro-18gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
| Medium |
| F0 |
Q4_K_M | 4 | 411.8 GB | Medium | F0 |
Q5_K_M | 5 | 486.0 GB | High | F0 |
Q6_K | 6 | 553.5 GB | High | F0 |
Q8_0 | 8 | 722.3 GB | Very High | F0 |
F16 | 16 | 1383.7 GB | Maximum | F0 |
Move to a larger memory pool. A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
Not always. MacBook Pro M3 Pro 18GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.
