hub站的grok模型怎么接入grok build？

公益站、cpa的我直接这样接都是能用的，改成api_backend = "Responses"也报错，换了几个渠道，都是调用工具就报错

[model."grok-4.6-HUB"]

model = "grok-4.6"

base_url = "https://hub.linux.do/v1"

name = "Grok 4.6 HUB"

description = "grok-4.6"

api_key = "ah-xxx"

api_backend = "chat_completions"

context_window = 500000

reasoning_efforts = [

    "low",

    "medium",

    "high",

]

supports_backend_search = true

supports_reasoning_effort = true