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Claude Sonnet 5 vs Kimi K3

Claude Sonnet 5Anthropic
Kimi K3Moonshot AI
Our take

Kimi K3 wins 4 of 4 categories, but Claude Sonnet 5 is 1.5× cheaper for everyday text work. Pick Kimi K3 when quality matters most, Claude Sonnet 5 at volume.

Overall5365Best
Coding5574Best
Writing5369Best
Support5673Best
Value4352Best
Input / 1M$2.00Best$3.00
Output / 1M$10.00Best$15.00
Blended / 1M$4.00Best$6.00
Context window1M1MBest
Open weightsNoYes
Released29 Jun 202616 Jul 2026

Your monthly bill

50k
Claude Sonnet 5$800Cheapest
Kimi K3$1.2k
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.