n8n Workflow: GPT-4o Text Generation via OpenAI API

Generate GPT-4o text in n8n using the OpenAI-compatible TokenWorks Chat Completions API

Turn any prompt into ready-to-use text by running an n8n workflow that sends your input to TokenWorks’ OpenAI-compatible /v1/chat/completions endpoint and returns the GPT-4o (or another model) response instantly.

What this workflow does

• Builds a prompt inside the workflow using the Set node (a plain text string that defines what you want the model to answer).
• Sends an HTTP POST request to TokenWorks (token8341.com) at /v1/chat/completions.
• Maps the prompt into the messages array for a Chat Completions style request.
• Sets the model field to gpt-4o (you can change this to use a different model by updating the request body).
• Returns the generated chat completion from TokenWorks as the workflow output.

Use cases

• Create draft marketing copy, product descriptions, or landing page sections from a single prompt in an n8n automation.
• Generate structured text for internal documentation or knowledge base articles.
• Produce response templates (e.g., FAQ answers or support replies) based on input context.
• Use GPT-4o text generation as a building block inside larger n8n automations for SaaS operations.

Technical details

• Category: n8n automation workflow
• Nodes used: Set, HTTP Request
• API integration: TokenWorks OpenAI-compatible Chat Completions endpoint /v1/chat/completions
• Authentication: add an n8n HTTP Header Auth credential (e.g., Authorization: Bearer <TOKENWORKS_API_KEY>) and select it in the HTTP request step
• Output: the workflow returns the TokenWorks generated chat completion response

Setup tip: create a TokenWorks account, generate an API key, update the workflow prompt, and confirm the model you want (default: gpt-4o).