Written by Jakub Rusinowski · Last updated September 11, 2026
No — GLM-5.3-Flash doesn't fit the Apple M2 Ultra's 192 GB. The cheapest card that runs it is the Apple M3 Ultra (512 GB).
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| VRAM | 192 GB unified memory |
| Memory Bandwidth | 800 GB/s |
| Quant | VRAM needed | Fits 192 GB? | Max context |
|---|---|---|---|
| F16 | 642.8 GB | ✗ No | — |
| Q8_0 | 342.8 GB | ✗ No | — |
| Q6_K | 265.2 GB | ✗ No | — |
| Q5_K_M | 229.6 GB | ✗ No | — |
| Q4_K_M | 196 GB | ✗ No | — |
| Q3_K_M | 139.2 GB | ✓ Yes | 64K |
| Q2_K | 108 GB | ✓ Yes | 128K |
VRAM needed assumes a 4K-token context with an f16 KV cache; “Max context” is the largest window that still fits in 192 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Every GLM-5.3-Flash variant requires more VRAM than the Apple M2 Ultra provides (192 GB).
Apple M3 Ultra (512 GB VRAM).
GLM-5.3-Flash needs ~193 GB but this GPU has 192 GB. Rent a 8× H100 (640 GB)-class GPU by the hour instead of buying one:
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No — GLM-5.3-Flash doesn't fit the Apple M2 Ultra's 192 GB. The cheapest card that runs it is the Apple M3 Ultra (512 GB).
The Apple M3 Ultra (512 GB VRAM) is the cheapest upgrade that fits it.
← Can I Run It? | GLM-5.3-Flash Model Page | Apple M2 Ultra GPU Page | Check Your Hardware