OpenAI Chat Completions API

Creates model-generated messages in response to a conversation. Chat models take a list of messages as input and return a model-generated message as output. The chat format supports multi-turn conversations as well as single-turn tasks. Supports GPT-5, GPT-4.1, o4-mini, and other models with function calling, structured outputs, vision, and streaming. Contact Support: Name: OpenAI Support Email: [email protected]

• AI
• Artificial Intelligence
• Large Language Models
• T1
• Postman Collection

Overview

OpenAI Chat Completions API is a Postman Collection published by OpenAI on the APIs.io network.

Creates model-generated messages in response to a conversation. Chat models take a list of messages as input and return a model-generated message as output. The chat format supports multi-turn conversations as well as single-turn tasks. Supports GPT-5, GPT-4.1, o4-mini, and other models with function calling, structured outputs, vision, and streaming. Contact Support: Name: OpenAI Support Email: [email protected]

The collection contains 1 request organised into 2 folders.

Tagged areas include AI, Artificial Intelligence, Large Language Models, and T1.

Requests & Folders

chat