Model MenuGet the Friday letter

Kimi K3.1 Pro vs DeepSeek V4.1 Flash 1017

Kimi K3.1 ProMoonshot AI
DeepSeek V4.1 Flash 1017DeepSeek
Our take

Kimi K3.1 Pro wins 1 of 1 categories, but DeepSeek V4.1 Flash 1017 is 7.6× cheaper for everyday text work. Pick Kimi K3.1 Pro when quality matters most, DeepSeek V4.1 Flash 1017 at volume.

Overall––
Coding79Best74
Writing––
Support––
Value––
Input / 1M$2.00$0.30Best
Output / 1M$10.00$1.20Best
Blended / 1M$4.00$0.53Best
Context window1M1M
Open weightsNoYes
Released23 Oct 202617 Oct 2026

Your monthly bill

50k
Kimi K3.1 Pro$800
DeepSeek V4.1 Flash 1017$105Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.