OpenAI Responses API Adapter for LLM and AI Agent Workflows

This n8n template demonstrates how to use OpenAI's Responses API with existing LLM and AI Agent nodes. Though I would recommend just waiting for official support, if you're impatient and would like a round-about way to integrate OpenAI's responses API into your existing AI workflows then this template is sure to satisfy! This approach implements a simple API wrapper for the Responses API using n8n's builtin webhooks. When the base url is pointed to these webhooks using a custom OpenAI credential, it's possible to intercept the request and remap for compatibility. How it works An OpenAI subnode is attached to our agent but has a special custom credential where the baseurl is changed to point

Help me set up the n8n workflow "OpenAI Responses API Adapter for LLM and AI Agent Workflows" (https://n8n.io/workflows/4218). It uses: HTTP Request, Code, AI Agent, OpenAI Chat Model. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.