Moonshot AI released Kimi K3’s full 2.8-trillion-parameter weights on July 27, 2026, making it the largest open-weight model published to date. Despite the massive parameter count, the mixture-of-experts design activates only approximately 50 billion parameters per token, resulting in per-token inference costs comparable to mid-size models. The critical constraint is the 1.4-terabyte memory footprint required to load the weights, limiting practical deployment to cloud providers and enterprises with access to Blackwell or MI400 accelerators rather than individual developers.
