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Moonshot AI Launches Kimi K3, a 2.8T Open-Weight Model Topping Code Benchmarks

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Moonshot AI released Kimi K3 on July 16, 2026, just ahead of the World Artificial Intelligence Conference in Shanghai. The Beijing-based lab, backed by Alibaba, built K3 as a Mixture-of-Experts model with 2.8 trillion total parameters and approximately 50 billion active parameters per token. The model debuted at first place on Arena.ai's Frontend Code Arena with a score of 1,679, a jump of 17 positions from its predecessor K2.6. K3 supports a 1,048,576-token context window, native image and video understanding, and introduces two new architectural mechanisms — Kimi Delta Attention and Attention Residuals — aimed at faster decoding and improved training efficiency. The open-weight model is compatible with the OpenAI SDK and integrates with developer tools such as Claude Code, Cursor, Cline, and RooCode, though it is priced at frontier-model rates rather than the budget tier of earlier Kimi releases.

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