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Moonshot AI Releases Kimi K3, a 2.8 Trillion Parameter Model

Jul 16, 2026

Chinese AI lab Moonshot AI has announced Kimi K3, a model with 2.8 trillion parameters, describing it as their most capable to date. The model is available via website and API, with open weights promised by July 27, 2026. Self-reported benchmarks suggest Kimi K3 outperforms Claude Opus 4.8 and GPT-5.5 on some tasks, and pricing is set at $3 per million input tokens and $15 per million output tokens, making it the most expensive Chinese model so far.

Why it matters: Kimi K3 represents a new scale for open-weight AI models, intensifying competition with leading proprietary systems.

Full story at: Simon Willison's Weblog ↗

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