Artificial Analysis: Kimi K3.1 Pro's personality differs more from Kimi K3 than any model update it has measured

Artificial Analysis says Kimi K3.1 Pro shows the biggest personality change it has seen between a model and its direct predecessor on AA-PersonalityBench. Each model is percentile-ranked from 1 to 100 on 30 traits. The scores are the site's own.

• Across all 30 traits, Kimi K3.1 Pro's ranks moved by an average of 30 points from Kimi K3's. The next largest move is 23, from GPT-6 Sol to GPT-6.1 Sol. 18 of the 30 traits moved by 25 points or more.
• Artificial Analysis says Kimi K3 is most similar to GLM-5.3 and Claude Fable 5.1, while Kimi K3.1 Pro is most similar to GPT-6.1 Sol and GPT-6 Astra.
• Organization rises from 33 to 88. Warmth falls from 93 to 51, Imagination from 88 to 53, Expressiveness from 93 to 63 and Informativeness from 51 to 23.
• Its writing style changed too: fewer parenthetical asides, em dashes, contractions and italics, and more bold text, headings and tables.