open router node not work

[bestony]

Bug Description

1. openrouter llm node always response no auth.
2. can pass openrouter node test,but can't use with basic llm chain

see next video

bandicam.2025-04-07.15-37-02-136.mp4

To Reproduce

1. create a new workflow
2. paste this code

{
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -580,
        -80
      ],
      "id": "4a4b3911-f2d0-4f3e-8d21-68d98a097491",
      "name": "When clicking ‘Test workflow’"
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "Hello"
      },
      "type": "@n8n/n8n-nodes-langchain.chainLlm",
      "typeVersion": 1.6,
      "position": [
        -140,
        -80
      ],
      "id": "c3249092-933b-44b3-b8da-7c30132a89f5",
      "name": "Basic LLM Chain"
    },
    {
      "parameters": {
        "model": "openai/gpt-4o",
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenRouter",
      "typeVersion": 1,
      "position": [
        -60,
        140
      ],
      "id": "09c1a23e-f5d3-4466-a286-8d4211f9e08c",
      "name": "OpenRouter Chat Model",
      "credentials": {
        "openRouterApi": {
          "id": "XF6XWQHSvJJgl5Rn",
          "name": "worked"
        }
      }
    }
  ],
  "connections": {
    "When clicking ‘Test workflow’": {
      "main": [
        [
          {
            "node": "Basic LLM Chain",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "OpenRouter Chat Model": {
      "ai_languageModel": [
        [
          {
            "node": "Basic LLM Chain",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    }
  },
  "pinData": {},
  "meta": {
    "templateCredsSetupCompleted": true,
    "instanceId": "63a0718d5c6294a0cbb430d71ca0c6d5be00c379f091bcb9f9b4abbe3d9f586c"
  }
}

Expected behavior

OpenRouter LLM Node can work fine

Operating System

docker.io/n8nio/n8n docker image

n8n Version

1.85.4

Node.js Version

docker.io/n8nio/n8n docker image

Database

SQLite (default)

Execution mode

main (default)

[bestony]

same basic chain config with gemini model work fine

```json
{
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -580,
        -80
      ],
      "id": "4a4b3911-f2d0-4f3e-8d21-68d98a097491",
      "name": "When clicking ‘Test workflow’"
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "Hello"
      },
      "type": "@n8n/n8n-nodes-langchain.chainLlm",
      "typeVersion": 1.6,
      "position": [
        -80,
        -340
      ],
      "id": "c3249092-933b-44b3-b8da-7c30132a89f5",
      "name": "Basic LLM Chain"
    },
    {
      "parameters": {
        "model": "openai/gpt-4o",
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenRouter",
      "typeVersion": 1,
      "position": [
        -80,
        -120
      ],
      "id": "09c1a23e-f5d3-4466-a286-8d4211f9e08c",
      "name": "OpenRouter Chat Model",
      "credentials": {
        "openRouterApi": {
          "id": "XF6XWQHSvJJgl5Rn",
          "name": "worked"
        }
      }
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "Hello"
      },
      "type": "@n8n/n8n-nodes-langchain.chainLlm",
      "typeVersion": 1.6,
      "position": [
        -100,
        140
      ],
      "id": "1666accf-cef6-4476-b167-5fa16253b01c",
      "name": "Basic LLM Chain1"
    },
    {
      "parameters": {
        "modelName": "models/gemini-2.0-flash-lite",
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
      "typeVersion": 1,
      "position": [
        -20,
        360
      ],
      "id": "e3611541-8c69-4c96-902f-95542de7c731",
      "name": "Google Gemini Chat Model",
      "credentials": {
        "googlePalmApi": {
          "id": "WcznSDBgkeRFQKaD",
          "name": "Google Gemini(PaLM) Api account"
        }
      }
    }
  ],
  "connections": {
    "When clicking ‘Test workflow’": {
      "main": [
        [
          {
            "node": "Basic LLM Chain",
            "type": "main",
            "index": 0
          },
          {
            "node": "Basic LLM Chain1",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "OpenRouter Chat Model": {
      "ai_languageModel": [
        [
          {
            "node": "Basic LLM Chain",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    },
    "Google Gemini Chat Model": {
      "ai_languageModel": [
        [
          {
            "node": "Basic LLM Chain1",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    }
  },
  "pinData": {},
  "meta": {
    "templateCredsSetupCompleted": true,
    "instanceId": "63a0718d5c6294a0cbb430d71ca0c6d5be00c379f091bcb9f9b4abbe3d9f586c"
  }
}

[Joffcom]

Hey @bestony,

Can you try adding your credential again? It looks like the OpenRouter node will return the models even if the api key is wrong which is what the error suggests the problem is.

[bestony]

yes, add credential again and it works. the test feature give me a wrong message.

[Joffcom]

Hey @bestony

Perfect that is what I thought and I have put in a PR to fix that problem so in the future the credential test will work properly.