Always resolves to the newest live Deepseek Flash model — currently DeepSeek V4.1 Flash (deepseek/deepseek-v4.1-flash). DeepSeek V4.1 Flash is the cost-efficient sparse MoE tier of the V4.1 family (1M context, vision in, text out). Official API id is `deepseek-flash`; OpenRouter lists the same product as `deepseek/deepseek-v4.1-flash`.