deepseekAPI 标价已核验6 项DeepSeek V4 ProAPIUSD / 1M tokens缓存输入off peak低峰折扣0.022缓存输入标准高峰标价0.044输入off peak低峰折扣0.66输入标准高峰标价1.32输出off peak低峰折扣1.98输出标准高峰标价3.96