Choosing the right ChatGPT (OpenAI) action to send messages

This article will guide you through the differences between available ChatGPT (OpenAI) actions you can use in your Zap to send and receive messages. It will help you decide which action is best for your needs when sending messages. There are three actions available:

• Conversation (Responses API).
• Conversation with Assistant.
• Send Prompt 

ChatGPT (OpenAI) action comparison table

Feature	Conversation (Responses API)	Conversation with Assistant	Send Prompt
Best for	Conversations that require back-and-forth interactions. Includes memory and optional image support.	Conversations with structured assistants that can store files, use tools, and maintain long context.	Simple, one-off prompts that do not need memory or media.
Context retention	Supports memory via the Memory Key field.	Supports memory via the Conversation ID field and assistant-specific instructions.	No support for context retention. Each request is independent.
API used	Responses API	Assistant API	Completion API
Supported models	GPT-4o GPT 4.1 GPT 4o mini o4 mini o3 and o3-mini o1	GPT-4o GPT-4-Turbo and GPT-4 o1 and o1 mini o3-mini GPT-3.5 Turbo	Deprecated chat models (text generation): Babbage-002 Davinic-002 gpt-3.5-turbo-instruct DALL-E (Image generation) TTS (Text-to-speech) Whisper (Speech to text)
Media support	Images supported (if model allows, e.g. GPT-4o).	Supports file uploads (code interpreter and file search).	No media support.
Tool support	Code Interpreter File Search Remote MCP Web Search Preview	Code Interpreter File Search	N/A