Moonshot Unveils Kimi K3, a 2.8‑Trillion‑Parameter Open‑Source AI

Overview

• Moonshot announced the Kimi K3 on Friday, July 17, 2026, saying the model has 2.8 trillion parameters and a 1‑million‑token context window to handle long, multi‑step tasks.
• The company published comparisons and cited third‑party evaluations that rank Kimi K3 alongside top Western systems, including Arena.ai, Vals AI and Artificial Analysis reports.
• Moonshot said Kimi K3 matches or approaches Anthropic’s Fable on several benchmarks and reports faster GPU kernel performance than Opus 4.8, GPT‑5.6 Sol and GPT‑5.5.
• The launch prompted sharp share declines for some Hong Kong‑listed Chinese AI firms and followed reports that Moonshot, backed by investors such as Alibaba and Tencent, has sought a large funding round and high valuation.
• The development highlights a broader trend of Chinese labs rapidly scaling open models, which could speed global diffusion of advanced AI because open models can be downloaded, run and adapted by outside users.