Kimi K3.1 Pro API Pricing: Half of Claude Opus 5.5, Same as Sonnet 5.5

Kimi K3.1 Pro lists at $2 input and $10 output per 1M tokens: a third below Kimi K3, half of Claude Opus 5.5, level with Sonnet 5.5, GPT-6.1 Sol and Argon.