Published on •Updated
Chinese AI model Kimi K3 got too popular for its own good.
Just days after its launch, Moonshot AI has had to pull the plug on new signups because so many people piled in to try it that the company ran out of computing power to cope.
The Beijing-based firm broke the news on X late on Sunday, admitting demand had “pushed close to the limits” of its systems in just 48 hours. The good news, if you already have an account: nothing changes for you.
The bad news for everyone else: new signups are paused until Moonshot can add more capacity, which it says will happen gradually, “in batches”.
It is becoming a familiar pattern. Chinese AI labs keep building models good enough to grab headlines worldwide, then discover they do not have the servers to handle the stampede that follows.
And that scramble to keep up says a lot about just how heated the AI rivalry between China and the US has become.
A crowded field of Chinese challengers
Kimi K3 is part of a wave of low-cost, openly available Chinese models that have gained traction internationally in recent months, following DeepSeek’s V4 release and the market shock caused by DeepSeek’s original model in early 2025, which prompted many to view China as a serious AI rival to the US.
Chinese frontier models tend to be open weight, meaning developers can examine and adapt the underlying system rather than access it only through a paid interface.
Moonshot launched Kimi K3 last week as a 2.8 trillion-parameter model, making it the largest open-weight system released to date.
According to the South China Morning Post, it has outperformed rivals including GPT-5.6 Sol and Claude Fable 5 on some benchmarks, including Arena’s ranking for front-end coding capability, where it topped the leaderboard following its public release.
Lian Jye Su, chief analyst at technology research firm Omdia, said new model releases typically generate a spike in interest that can strain existing infrastructure.
“This does show Moonshot AI does not have sufficient compute chips to serve the current surge in demand,” he said.
Su added that the more likely explanation was that Moonshot underestimated how popular K3 would become, noting the model is unusually demanding in terms of compute, which makes allocating capacity both difficult and costly.
Pressure on US tech stocks
The release has weighed on shares of major US technology firms, amid concern that cheaper Chinese alternatives could squeeze the pricing power of American AI companies.
This comes despite US-led export restrictions that have already limited China’s access to some of the most advanced chips on the market.
Kimi K3 is the latest in a string of Chinese releases to draw international attention.
Over the weekend, Alibaba previewed its Qwen3.8 Max model, which it said has 2.4 trillion parameters and ranks “second only to” Anthropic’s Fable 5 among frontier systems — a claim made by Alibaba itself, with no independent benchmarks yet published to support it.
Last month, Chinese startup Zhipu, also known as Z.ai, released its GLM-5.2 model, which has seen swift uptake internationally.
Additional sources • AP