Kimi K3.1 Pro vs Claude Sonnet 5.5: scores, price and which to pick

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Our take

Claude Sonnet 5.5 wins 1 of 1 categories.

Overall–79

Coding7987Best

Writing–74

Support–69

Value–69

Input / 1M$2.00$2.00

Output / 1M$10.00$10.00

Blended / 1M$4.00$4.00

Context window1MBest1M

Open weightsNoNo

Released23 Oct 202628 Sept 2026

Your monthly bill

Tasks per month50k

Kimi K3.1 Pro$800Cheapest

Claude Sonnet 5.5$800Cheapest

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