the biggest open AI model ever drops this week. you can download all 1.4 terabytes — you just can't run it

The short answer

Kimi K3 is a 2.8-trillion-parameter open-weight Mixture-of-Experts model from Moonshot AI, with full weights releasing July 27, 2026. Quantized to MXFP4 the weights are ~1.4TB (≈5.6TB at FP16), so…

Open weights July 27, 2026 — the largest open model ever, 1 on the Frontend Code Arena (1,679 points).

~1.4TB at MXFP4, ~5.6TB at FP16. No single consumer GPU, and not even a 512GB Mac Studio, can hold the weights.

The MoE trap: only ~50B of 2.8T parameters are active per token (16 of 896 experts), so compute is manageable — but every parameter must still sit in memory. MoE saves compute, not capacity.

What you'd need: roughly a full 8×B200 (1,440GB) datacenter node, or an equivalent multi-node setup, just to load it.

What you can run instead: capable open models like Qwen3-32B on a single 24GB card get most people most of the way.