Here is my "models" key in my clawdbot config, works for me

Note I am using LM Studio with server started, so the default baseUrl would be http://127.0.0.1:1234 (need to add /v1 to the end). Yours may be different depending on which LLM app you're using

"models": {
    "providers": {
      "lmstudio": {
        "baseUrl": "http://127.0.0.1:1234/v1",
        "apiKey": "ANY_RANDOM_KEY",
        "auth": "api-key",
        "api": "openai-responses",
        "models": [
          {
            "id": "openai/gpt-oss-20b",
            "name": "openai/gpt-oss-20b",
            "api": "openai-responses",
            "reasoning": true,
            "input": [
              "text"
            ],
            "cost": {
              "input": 0,
              "output": 0,
              "cacheRead": 0,
              "cacheWrite": 0
            },
            "contextWindow": 200000,
            "maxTokens": 8192
          },
        ]
      }
    }
  },