Claude Sonnet 5.5 vs Kimi K3: scores, price and which to pick

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Our take

Claude Sonnet 5.5 wins 3 of 4 categories and costs less: 1.5× cheaper for everyday text work. Easy pick.

Overall79Best65

Coding87Best74

Writing74Best69

Support6973Best

Value69Best52

Input / 1M$2.00Best$3.00

Output / 1M$10.00Best$15.00

Blended / 1M$4.00Best$6.00

Context window1M1MBest

Open weightsNoYes

Released28 Sept 202616 Jul 2026

Your monthly bill

Tasks per month50k

Claude Sonnet 5.5$800Cheapest

Kimi K3$1.2k

List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.