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Kimi K3 is Moonshot AI's most capable model to date, a 2.8 trillion parameter model being called the first open 3T-class model, surpassing DeepSeek's 1.6T v4 Pro.

Moonshot AI announced Kimi K3, a 2.8T parameter model they're branding as the first 'open 3T-class model,' with an open weight release promised by July 27, 2026. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-16 · original ↗

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Moonshot are calling this the first "open 3T-class model" (I guess they're rounding 2.8 trillion up to 3 trillion), taking the crown from DeepSeek's 1.6T v4 Pro.

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▦ DeepSeek ▦ Moonshot AI ✳ Kimi K3

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Evidence · 1

OpenRouter is already offering K3 from 7 providers, most at the same $3/million input and $15/million output tokens as Moonshot AI themselves.Author · Simon Willison's Weblog · conf 75%

Extends · 2

Kimi K3's pricing of $3/million input and $15/million output tokens matches Anthropic's Claude Sonnet series and makes it the most expensive Chinese-lab model released to date, a large jump from K2.6's $0.95/$4.Simon Willison · Simon Willison's Weblog · conf 65%Kimi K3 currently offers only one reasoning effort level, 'max,' which makes it expensive to run: it burned 13,241 reasoning tokens to produce just 3,417 tokens of output, costing 25 cents for a single pelican SVG.Simon Willison · Simon Willison's Weblog · conf 65%

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extends → Kimi K3 is an 'Open Frontier Intelligence' model with 2.8T total parameters, 1M-token context, native multimodal input, Kimi Delta Attention (KDA), and Attention Residuals, live on Kimi.com, Kimi Work, Kimi Code, and API, with open weights promised by July 27, 2026.Moonshot AI · Latent Space