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
```