Can I Run GLM-6 on Apple M3 Ultra?
Written by Jakub Rusinowski · Last updated July 12, 2026
Yes, comfortably — GLM-6 355B-A32B at Q4_K_M needs 219.2 GB at 8K context (214.3 GB weights + 4.9 GB KV cache/overhead), leaving ~164.8 GB of the Apple M3 Ultra's 384 GB usable memory, at ~20 tok/s (est.), with room for up to 128K context.
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Apple M3 Ultra Specs
| VRAM | 512 GB unified memory |
| Memory Bandwidth | 819 GB/s |
GLM-6 355B-A32B on the Apple M3 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 512 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 714.9 GB | ✗ No | — | — |
| Q8_0 | 382.1 GB | ✓ Yes | 8K | — |
| Q6_K | 296 GB | ✓ Yes | 128K | — |
| Q5_K_M | 256.5 GB | ✓ Yes | 128K | — |
| Q4_K_M | 219.2 GB | ✓ Yes | 128K | — |
| Q3_K_M | 156.2 GB | ✓ Yes | 128K | — |
| Q2_K | 121.6 GB | ✓ Yes | 128K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 512 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M3 Ultra: 8K 219.2 GB · 32K 231.5 GB · 128K 280.6 GB. Every window this model publishes still fits 512 GB.
No compatible GPU? GLM-6 on 8 GB of system RAM, CPU only: runs, but it is tight.
GLM-6 Sizes That Fit the Apple M3 Ultra (at 8K context)
| GLM-6 355B-A32B | Q4_K_M · 219.2 GB at 8K context · ~20 tok/s (est.) |
| GLM-6 9B | Q4_K_M · 7.4 GB at 8K context · ~61 tok/s (est.) |
GLM-6 needs ~219 GB but this GPU has 512 GB. Rent a 8× H100 (640 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Will GLM-6 run on the Apple M3 Ultra?
Yes, comfortably — GLM-6 355B-A32B at Q4_K_M needs 219.2 GB at 8K context (214.3 GB weights + 4.9 GB KV cache/overhead), leaving ~164.8 GB of the Apple M3 Ultra's 384 GB usable memory, at ~20 tok/s (est.), with room for up to 128K context.
Which GLM-6 variant fits best on the Apple M3 Ultra?
GLM-6 355B-A32B at Q4_K_M quantization needs 219.2 GB at 8K context (214.3 GB weights + 4.9 GB KV cache/overhead), estimated ~20 tokens/sec, up to 128K context.
Every GLM-6 size on the Apple M3 Ultra
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| GLM-6 355B-A32B | 219.2 GB | Runs | ~20 tok/s |
| GLM-6 9B | 7.4 GB | Runs | ~61 tok/s |
Popular Models on the Apple M3 Ultra
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