Moonshot AI's Kimi-K3 Outperforms US Models, SOXX Falls 1.64% on Friday

According to Arena AI platform results, Moonshot AI launched open-weight model Kimi-K3 on Thursday, demonstrating superior performance in programming tasks compared to Anthropic's Claude and OpenAI's advanced models. The news triggered declines in U.S. tech stocks on Friday: iShares Semiconductor ETF (SOXX) fell 1.64% for the third consecutive trading day, while the Nasdaq Composite dropped 1.40%. However, the market reaction was notably more muted than when DeepSeek introduced its R1 model in January 2025, which had sparked an 7.8% plunge in SOXX and a 3.1% decline in Nasdaq.

Unlike Claude or GPT series, Kimi-K3 operates on an open-weight model, allowing enterprises to deploy the model on their own servers or private clouds without direct payment to Moonshot. The company plans to release the complete model weights on July 27. Analysts noted that if lower-cost open-weight models deliver comparable performance to premium closed-source U.S. models, they could challenge the investment rationale behind billions of dollars in data center infrastructure expansion by cloud providers and chip manufacturers.