Z.ai
GLM 5.3 Flash
Z.ai model discovered on huggingface
Model Summary
Family
GLM
Version
5.3
Parameters
321.3B (est.)
Parameter counts for closed models are estimates; vendors rarely publish exact sizes.
VRAM Requirements by Quantization
Memory needed to serve GLM 5.3 Flash for inference, including a 20% overhead for activations and KV cache.
| Precision | VRAM needed | Smallest single GPU that fits |
|---|---|---|
| INT4 (4-bit) | 179.54 GB | NVIDIA B200 SXM (192 GB) |
| INT8 (8-bit) | 359.08 GB | Multi-GPU required |
| FP16 (16-bit) | 718.16 GB | Multi-GPU required |
| FP32 (32-bit) | 1436.32 GB | Multi-GPU required |
Recommended GPU Configurations
Cheapest on-demand configurations to serve GLM 5.3 Flash at 8-bit (359 GB VRAM).
3x AMD Instinct MI250X
384 GB total VRAM · CDNA 2
~$7.50/h
23x NVIDIA T4
368 GB total VRAM · Turing · multi-node
~$11.50/h
2x AMD Instinct MI300X
384 GB total VRAM · CDNA 3
~$12.00/h
Quick GPU Planning
Use the calculator pre-filled with this exact version to estimate memory, speed, and compute requirements in a few clicks.
Access Pre-filled CalculatorFrequently Asked Questions
How much VRAM do you need to run GLM 5.3 Flash?
With an estimated 321.3B parameters, GLM 5.3 Flash needs roughly 359 GB of VRAM in 8-bit (INT8), 180 GB in 4-bit, and 718 GB in FP16, including a 20% overhead for activations and KV cache.
Which GPUs can run GLM 5.3 Flash?
At 8-bit quantization, the most cost-effective option is 3x AMD Instinct MI250X (384 GB combined VRAM, around $7.50/hour on-demand). Higher-end cards like the NVIDIA B200 or AMD MI355X reduce the GPU count needed.
Can GLM 5.3 Flash run on a single GPU?
Only with aggressive quantization: in 4-bit, a single NVIDIA B200 SXM (192 GB) can fit it. At 8-bit or higher, you need a multi-GPU setup.
How much does it cost to serve GLM 5.3 Flash in the cloud?
Renting 3x Instinct MI250X costs on the order of $7.50/hour, i.e. about $5,475/month running 24/7. Actual prices vary by provider and commitment; spot and reserved capacity can be significantly cheaper.
Deploy on a GPU cloud
Rent 3x Instinct MI250X by the hour instead of buying hardware.
