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Kimi K3.1 Pro open weights

Moonshot published the full Kimi K3.1 Pro weights on Hugging Face on Nov 4, the day it promised.

Moonshot released Kimi K3.1 Pro in its apps and API on Oct 23 and committed to releasing the full weights by Nov 4. The license terms have not been announced. As of Nov 1 there was still no K3.1 Pro repository on Moonshot's Hugging Face page (only the earlier Kimi K3). Checked again Nov 2 (about 14:00 UTC): Moonshot's newest Hugging Face repository is still Kimi K3 (last updated Sept 2); no K3.1 Pro weights yet. Checked again Nov 3 (about 14:00 UTC): still no K3.1 Pro repository; Moonshot's newest Hugging Face model is Kimi K3 (Sept 2). The deadline is Nov 4 with no time zone given, so we will check again next run before marking it Released or late. Checked again Nov 4 (about 14:00 UTC, already late evening on Nov 4 in China): Moonshot's Hugging Face organization still lists Kimi K3 (updated Sept 1-2) as its newest model, with no K3.1 Pro repository. If nothing appears by the end of Nov 4 UTC, we will mark the promise as missed next run. Update Nov 5: the weights are out. The public, ungated moonshotai/Kimi-K3.1-Pro repository went live on Nov 4 (ArtificialWatch saw it appear between about 14:30 and 15:31 UTC, just after our check): 96 safetensors shards totalling about 1.56 TB, MXFP4 weights trained that way, 2.8T total and 104B active parameters, a 1M-token context and text plus image input. The license matches the Kimi K3 terms: free use, modification and redistribution, but model-as-a-service firms with over $20 million in yearly revenue need a separate agreement, and very large products must display the model name. Moonshot kept its date.

Status
Released
Date
Nov 4, 2026
Maker
Moonshot AI
Type
AI model
Price
Free (open weights; Kimi K3.1-Pro License)
Categories
AI

Sources

Launch dates can change. Check the sources for the latest. Last reviewed Nov 10, 2026.

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