Beijing-based Moonshot AI unveiled Kimi K3 late Thursday, a 2.8-trillion-parameter open-weight model that the company calls “open frontier intelligence” and that Wall Street promptly treated as a threat to the entire American AI capex thesis. By 2 p.m. Eastern on Friday, the Nasdaq 100 was down 1%, TSMC had fallen 7% despite posting a 77% jump in quarterly operating profit the same week, and SoftBank was off 9%. Nvidia briefly lost its perch as the world’s most valuable company to Apple. Meta slid more than 2.4%. Chinese rival Z.ai plunged nearly 30% in Hong Kong, which tells you the panic wasn’t strictly about geography.

It was about the shape of the release. K3 is now the largest open-weight model ever shipped, dwarfing DeepSeek V4 Pro’s 1.6 trillion parameters and Zhipu AI’s 744-billion-parameter GLM 5 series. Moonshot says it still trails Anthropic’s Claude Fable 5 and OpenAI’s GPT 5.6 Sol on overall performance but consistently beats Claude Opus 4.8 and GPT-5.5 on coding and general-agent benchmarks. The independent Arena.AI leaderboard put it first outright, ahead of Anthropic. It’s priced at $15 per million output tokens against $50 for Anthropic’s Fable.

Bank of America analysts led by Alex Liu framed the takeaway plainly: “pre-training scaling, paired with architectural innovation, can still deliver step-change gains for flagship Chinese models.” Translated, the scaling-is-dead thesis that comforted incumbents for a year just got harder to defend.

Patrick Moorhead, CEO of Moor Insights and Strategy, called the selloff “an over-reaction shockingly similar the DeepSeek panic” and added on X, “We are far away from super-intelligence.”

He isn’t wrong about the panic. He may be underselling the commercial story. Moonshot raised $2 billion in May at a valuation over $20 billion, is reportedly raising again at $31.5 billion, and carries annual recurring revenue north of $200 million. Cursor already acknowledged in March that its Composer 2 agent runs on top of Kimi 2.5. American infrastructure customers have been quietly building on Chinese open weights for months. Friday was the day the market caught up.

Sources