Moonshot · Kimi line · flagship · open weights
Kimi K3.1 Pro was released by Moonshot on October 24, 2026, as an open-weights flagship model in the Kimi line.
A more heavily post-trained Kimi K3 that cuts its claim-level hallucination rate from 23.4% to 8.3% and keeps the 1M-token context, with open weights promised by November 4.
Compared with Kimi K3 · the model it replaces
Makes about a third as many false claims as Kimi K3
Kimi Hallu Bench Hard — share of claims that are factually wrong
8.3%
▲ down from 23.4% for Kimi K3 · lower is better
Scores 55 on a combined set of hard tests
Artificial Analysis Intelligence Index v4.3.2 — one score averaging 10 hard tests
55
✦ reasoning version · #4 of 215 models on Artificial Analysis, Oct 2026
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Kimi K3.1 Pro is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Kimi K3.1 Pro · Oct 24, 2026
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