Moonshot AI’s Kimi K3 rattles chip stocks, pauses signups amid surging demand

Beijing-based Moonshot AI released Kimi K3 on July 16, a 2.8 trillion-parameter open-weight model that the company says can compete with the leading American AI systems — and the market reaction was swift. By Friday, the Philadelphia Semiconductor Index had plunged into bear-market territory, and Nvidia ↘ 1.79% shares fell 2% as part of a broader technology selloff.wsj+1

A New Challenger at a Fraction of the Price

Kimi K3, which Moonshot calls the largest open model ever released, activates 16 of 896 experts per token across its mixture-of-experts architecture and supports a one-million-token context window with native vision capabilities. On the LMArena Frontend Code Arena benchmark, K3 debuted at No. 1 with an Elo rating of 1,679, surpassing Anthropic's Claude Fable 5. Independent evaluations from Artificial Analysis scored the model at 57 on its Intelligence Index, placing it on par with Claude Opus 4.8 and GPT-5.5 but still behind Claude Fable 5 and GPT-5.6 Sol.bbc+3

The pricing is where K3 makes its sharpest argument. Moonshot charges $3 per million input tokens and $15 per million output tokens, compared with $5 and $30 respectively for OpenAI's GPT-5.6 Sol. Artificial Analysis calculated K3's blended cost at $2.31 per million tokens against $4.35 for GPT-5.6 Sol. Moonshot has dated the full open-weight release for July 27, at which point any developer will be able to download and run the model.benchlm+4

Market Fallout and Subscription Freeze

The Wall Street Journal News Corp ↘ 1.47% reported that the surprise release "intensified a selloff in chip stocks," pushing the PHLX Semiconductor Index ↘ 2.06% down 10% for the week — its steepest weekly decline since April 2025. Samsung, Taiwan Semiconductor Manufacturing ↘ 1.73%, Intel ↘ 2.24%, and AMD Advanced Micro Devices, Inc. ↘ 3.52% all fell sharply on Friday alongside Nvidia. The S&P 500 dropped 1% and the Nasdaq 100 tumbled nearly 2%.businessinsider+1

Demand for K3 overwhelmed Moonshot's own infrastructure. In a July 19 post on X, the company said GPU resources had "approached their current capacity limits" over the prior 48 hours, forcing it to pause new Kimi subscriptions while existing members retain access. Moonshot said it would split its membership into separate tiers for its general assistant and its coding product as it scales compute.kucoin+2

IPO Ambitions

Moonshot is now moving to capitalize on the moment. Bloomberg reported Saturday that the company has distributed a shareholder resolution seeking investor approval for a Hong Kong listing that could occur within six months, with a concurrent fundraising round potentially valuing the three-year-old startup at more than $30 billion. The company's annual recurring revenue reached $300 million as of June, up from $200 million in April, according to The Next Web.thenextweb+1