Pondero Brief: 2026-07-27: Kimi K3 ships 2.8T open weights; the real fight is token cost

Moonshot AI released Kimi K3, a 2.8 trillion parameter open-weights model using sparse mixture-of-experts architecture, requiring 1.4 TB of GPU memory and resetting self-hosted frontier model economics. The release signals that frontier-grade open models now compete directly on inference cost with closed APIs, forcing every inference provider to integrate it.

This Wire brief sits within Fusion42's coverage of AI Frontier Models, and 34 sources have reported it between 18 Jul 2026 and 7 Aug 2026.