Moonshot AI Releases Kimi K3, World's Largest Open-Weight AI Model

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Moonshot AI launched Kimi K3 on July 16, 2026, a 2.8 trillion-parameter mixture-of-experts model designed for long-horizon coding and agentic tasks. It is the largest open-weight model announced to date, with full weights to be publicly released by July 27, 2026. K3 supports a 1-million-token context window, always-on reasoning, vision, and tool calls, and ranked fourth among 189 models on the Artificial Analysis Intelligence Index, on par with Claude Opus 4.8 and GPT-5.5. The model is part of a broader wave of frontier-class open-weight models from Chinese labs in 2026, including GLM-5.2, DeepSeek V4 Pro, and MiniMax M3, all MIT-licensed or equivalent. Developers can access all four models through a single OpenAI-compatible API endpoint via LLM Gateway, paying Moonshot's published rates of $3.00 per million input tokens and $15.00 per million output tokens.

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