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Moonshot AI announces Kimi K3, 2.8T parameter model with open weights promised by July 27

simonwillison.net · 2026-07-17

Moonshot AI's new flagship model is their largest yet and available immediately via API and website, though open-weight release is still pending. Simon Willison notes it is positioned to close the gap with Anthropic's Opus 4.8.

“Chinese AI lab Moonshot AI announced Kimi K3 this morning, describing it as their “most capable model to date, with 2.8 trillion parameters”.”

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Bears on: metaculus-weakly-general-ai-2028

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