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Chinese artificial intelligence startup Moonshot has introduced Kimi K3, describing it as the world’s largest open-weight AI model.<\/p>\n
The company said the model contains 2.8 trillion parameters, making it the first open-weight system to approach the three-trillion-parameter mark.<\/p>\n
According to Moonshot, Kimi K3 is designed for advanced reasoning, long-horizon coding, and complex knowledge work while delivering performance close to that of some of the industry’s most advanced AI systems.<\/p>\n
The launch reflects the rapid pace at which Chinese AI companies are expanding their capabilities as competition in the global AI industry intensifies.<\/p>\n
Moonshot said Kimi K3 is its most capable flagship model to date.<\/p>\n
The model is built on Kimi Delta Attention (KDA), a hybrid linear attention mechanism, along with Attention Residuals, which the company said improve computing efficiency.<\/p>\n
The company added that Kimi K3 includes native visual understanding and supports a 1-million-token context window, allowing it to process and retain significantly more information in a single prompt than earlier generations.<\/p>\n
According to Moonshot, the model is intended for frontier intelligence applications, including long-horizon coding, reasoning, and knowledge-intensive tasks.<\/p>\n
The company also described Kimi K3 as the world’s first open-source model in the three-trillion-parameter class.<\/p>\n
It represents the latest milestone in its effort to expand the scale of open-source AI models.<\/p>\n
Unlike proprietary closed-source AI systems, open-weight models allow users to download, run, and customise the underlying model.<\/p>\n
This gives developers and businesses greater flexibility to adapt AI systems for their own applications instead of relying entirely on cloud-based proprietary services.<\/p>\n
Kimi K3 delivered competitive performance against Anthropic’s Fable 5 model and substantially outperformed Anthropic’s Opus 4.8, GPT 5.6 Sol, and GPT 5.5 in GPU kernel optimisation.<\/p>\n
The company said GPU kernel optimisation refers to techniques that maximise AI hardware utilisation while reducing latency.<\/p>\n
Moonshot also highlighted results from several third-party evaluations.<\/p>\n
Vals AI placed the model second overall behind Fable 5 and ahead of GPT-5.6 Sol.<\/p>\n
Artificial Analysis also reported that Kimi K3 delivered performance comparable to OpenAI’s GPT-5.5 and Anthropic’s Claude Opus 4.8, particularly in tests involving complex, multi-step tasks.<\/p>\n
Moonshot said Kimi K3 introduces two major architectural upgrades aimed at improving computational efficiency and enabling long-horizon coding tasks with minimal human supervision.<\/p>\n
The company also said Kimi K3 continues its effort to push the boundaries of open-source model scale.<\/p>\n
According to Moonshot, Kimi models have remained at the frontier of open-source model scale during nine of the past twelve months.<\/p>\n
The unveiling of Kimi K3 comes as Chinese AI companies accelerate model releases and narrow the gap with leading US developers.<\/p>\n
Companies including Moonshot, Z.ai, and MiniMax have been introducing increasingly powerful AI systems while reducing deployment costs, challenging the long-held view that Chinese AI developers significantly lag their US counterparts.<\/p>\n
The latest launch follows the introduction of Z.ai’s GLM-5.2, which attracted industry attention after posting benchmark scores close to leading US closed-source AI models.<\/p>\n
Investor reaction was mixed.<\/p>\n
Following Moonshot’s announcement, shares of domestic AI rivals Zhipu and MiniMax fell sharply in Hong Kong.<\/p>\n
Just before the market closed, the stocks were down 27.7% and 16.5%, respectively.<\/p>\n
Moonshot, which is backed by Alibaba and Tencent, has continued expanding its AI capabilities and funding.<\/p>\n
Bloomberg previously reported that the company was seeking $2 billion in fresh funding at a valuation of about $30 billion ahead of a potential Hong Kong listing.<\/p>\n