Moonshot AI releases Kimi K3.1 Pro reasoning model
What happened
On 24 October 2026, Moonshot AI released Kimi K3.1 Pro, a post-trained version of Kimi K3. According to The Decoder, the model scores 55 on the Artificial Analysis Intelligence Index, 11 points above K3, placing fourth behind Claude Opus 5.5 (58), Claude Sonnet 5.5 (56) and Muse Wonder Full (56). The report says its ranking is closing in on Claude Opus 5.5. So far the story is limited to the release and the leaderboard score.
Written by AI from the reports · updated 2 h ago
Timeline
Follow the reports to see the event from each side.
- The DecoderSelectedChinese AI model Kimi K3.1 Pro is closing in on Anthropic's Claude Opus 5.5
Moonshot AI's Kimi K3.1 Pro scores 55 points on the Artificial Analysis Intelligence Index, an 11-point jump over its predecessor that puts it in fourth place. Only three Anthropic and Meta models rank higher. If Moonshot releases the weights as planned, the gap between open and proprietary models shrinks to just three points.
Heat of this event
Not enough continuous observations yet to draw a trend.