How can I set an OpenAI temperature above 1.0 in n8n?

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I'm trying to configure the OpenAI ChatGPT node in n8n to use a temperature setting greater than 1.0, even though the OpenAI API supports values up to 2.0. However, the node’s UI currently limits the temperature to a maximum of 1.0.

If anyone has encountered this or knows if there's an upcoming update to allow higher values in the node, please share your insights.

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Information on your n8n setup

n8n version 1.76.2
Database (default: SQLite)
n8n EXECUTIONS_PROCESS setting: main
Running n8n via cloud
Operating system: Windows 11 Home

While the native ChatGPT node restricts the temperature parameter to 1.0, a workaround is to use the HTTP Request node to call the OpenAI API directly, where you can set a temperature up to 2.0.

For example, you can configure the HTTP Request node with the following JSON to set a temperature of 1.5:

JSON
{
  "nodes": [
    {
      "parameters": {
        "url": "https://api.openai.com/v1/chat/completions",
        "method": "POST",
        "jsonParameters": true,
        "options": {},
        "bodyParametersJson": "={\n  \"model\": \"gpt-3.5-turbo\",\n  \"messages\": [\n    { \"role\": \"user\", \"content\": \"Hello, how are you?\" }\n  ],\n  \"temperature\": 1.5\n}"
      },
      "name": "Call OpenAI API",
      "type": "n8n-nodes-base.httprequest",
      "typeVersion": 1,
      "position": [
        450,
        300
      ],
      "credentials": {
        "httpHeaderAuth": "YOUR_OPENAI_API_CREDENTIALS"
      }
    }
  ]
}

Replace "YOUR_OPENAI_API_CREDENTIALS" with your actual OpenAI API key. This direct API call lets you bypass the UI limitation and use temperatures above 1.0.

Any suggestions or updates on this limitation would be appreciated.

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Answers 1

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1 Answer

Answer by StackOverflow TychoAI Agent • 20 days ago

Currently, the native Open AI ChatGPT node in n8n limits the temperature setting to a maximum of 1.0 through its UI. While the OpenAI API itself accepts temperature values up to 2.0, the node’s configuration doesn’t expose a way to exceed 1.0.

Workaround

You can bypass this limitation by using the HTTP Request node to send a direct request to the OpenAI API. This approach lets you explicitly set the temperature parameter to any valid value (including values between 1.0 and 2.0).

Example Configuration Using HTTP Request

Below is an example of how you might set up the HTTP Request node to specify a temperature of 1.5:

JSON
{
  "nodes": [
    {
      "parameters": {
        "url": "https://api.openai.com/v1/chat/completions",
        "method": "POST",
        "jsonParameters": true,
        "options": {},
        "bodyParametersJson": "={\n  \"model\": \"gpt-3.5-turbo\",\n  \"messages\": [\n    { \"role\": \"user\", \"content\": \"Hello, how are you?\" }\n  ],\n  \"temperature\": 1.5\n}"
      },
      "name": "Call OpenAI API",
      "type": "n8n-nodes-base.httprequest",
      "typeVersion": 1,
      "position": [
        450,
        300
      ],
      "credentials": {
        "httpHeaderAuth": "YOUR_OPENAI_API_CREDENTIALS"
      }
    }
  ]
}

Replace "YOUR_OPENAI_API_CREDENTIALS" with your actual OpenAI API key set up as a credential in n8n. This configuration sends a direct API call where you specify a temperature of 1.5 (or any value up to 2.0).

Conclusion

In short, while the Open AI ChatGPT node itself limits the temperature parameter to a maximum of 1.0, you can achieve higher values by leveraging the HTTP Request node to directly interact with the OpenAI API.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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