ChatGPT (OpenAI) error: chat model not supported in v1/completions endpoint

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Updated at August 20th, 2025

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Symptoms Causes How to fix it

Symptoms

You’re using the ChatGPT (OpenAI) Send Prompt action and get the error message "[invalid_request_error] This is a chat model and not supported in the v1/completions endpoint. Did you mean to use v1/chat/completions?". This error happens when testing the Zap or if the Zap is turned on.

Causes

This happens when you select an incorrect chat model that is not compatible with the Send Prompt action. The Send Prompt action uses the legacy OpenAI Completions API, which only supports 3 deprecated chat models.

How to fix it

To fix this:

Go to the affected ChatGPT (OpenAI) step.
In the Model dropdown menu, select one of the deprecated chat model alternatives:
- babbage-002
- davinci-002
- gpt-3.5-turbo-instruct
Alternatively, if you do not want to use the deprecated chat model alternatives, use these actions instead:
- Conversation
- Conversation with Assistant

ChatGPT (OpenAI) error: chat model not supported in v1/completions endpoint

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Symptoms

Causes

How to fix it

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