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Originally published on the QuickSilver Pro blog . Kimi K3.1 Pro is Moonshot's flagship model, and the usual comparison for it is Claude Opus 5.5. Most of those comparisons quote benchmark scores. We wanted to know what happens when you put both into the same coding agent and give them the same tasks: do they finish, how long do they take, and what does a task cost? On QuickSilver Pro, Kimi K3.1 Pro costs $2.00 / $10.00 per million tokens and Claude Opus 5.5 costs $1.00 / $5.00. Here Kimi is the more expensive of the two per token. Short answer, from 24 runs: Quality: a tie. Both models…

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