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China's Kimi K3 Beats Claude and ChatGPT to Top the Coding Leaderboard

Moonshot AI's Kimi K3 tops Frontend Code Arena, beating Claude Fable 5 and GPT-5.6 Sol with its open-weight model.

China's Kimi K3 Beats Claude and ChatGPT to Top the Coding Leaderboard

China's Moonshot AI has done it again. Less than a week after releasing Kimi K3, its newest open-weight model, the company has claimed the top position on one of the most competitive AI coding leaderboards in the world — beating Anthropic's Claude Fable 5 and OpenAI's GPT-5.6 Sol in the process. The development is the latest signal that the global AI race is genuinely two-sided, and that US dominance in frontier model performance is no longer a given. What Is Kimi K3? Released on July 16, 2026, Kimi K3 is Moonshot AI's most ambitious model to date. With 2.8 trillion total parameters, Moonshot describes it as the world's first open 3T-class system and the largest open-weight AI model ever released . Despite its enormous scale, K3 is built to be efficient. It uses a Mixture-of-Experts (MoE) architecture with 896 expert modules, but activates only 16 of them per token — roughly 1.8% of the full parameter pool — keeping inference costs manageable. Other headline specs includ…

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Puneet Sharma is a freelance web developer, tech writer, and blogger. He is the founder of FWD Tools and runs WebDevPuneet and The Tech Watcher.

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