OpenAI · Postman Collection

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: support@openai.com

1
Requests
2
Folders
View on GitHub Raw JSON Artificial IntelligenceLarge Language ModelsT1Postman 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: support@openai.com

The collection contains 1 request organised into 2 folders.

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

Requests & Folders

chat

Related API Specs

OpenAI Responses API (OpenAPI) OpenAI Moderations API (OpenAPI) OpenAI Batch API (OpenAPI) OpenAI Vector Stores API (OpenAPI) OpenAI Uploads API (OpenAPI) OpenAI Realtime API (AsyncAPI) OpenAI Evals API (OpenAPI) OpenAI Videos API (OpenAPI) OpenAI Conversations API (OpenAPI) OpenAI Containers API (OpenAPI) OpenAI ChatKit API (OpenAPI) OpenAI Skills API (OpenAPI) OpenAI Assistants API (OpenAPI) OpenAI Audio API (OpenAPI) OpenAI Audit Logs API (OpenAPI) OpenAI Batch API (OpenAPI) OpenAI Certificates API (OpenAPI) OpenAI Chat API (OpenAPI) OpenAI Chatkit API (OpenAPI) OpenAI Completions API (OpenAPI) OpenAI Containers API (OpenAPI) OpenAI Conversations API (OpenAPI) OpenAI Embeddings API (OpenAPI) OpenAI Evals API (OpenAPI) OpenAI Files API (OpenAPI) OpenAI Fine Tuning API (OpenAPI) OpenAI Group organization role assignments API (OpenAPI) OpenAI Group users API (OpenAPI) OpenAI Groups API (OpenAPI) OpenAI Images API (OpenAPI) OpenAI Invites API (OpenAPI) OpenAI Models API (OpenAPI) OpenAI Moderations API (OpenAPI) OpenAI Organization API (OpenAPI) OpenAI Project group role assignments API (OpenAPI) OpenAI Project groups API (OpenAPI) OpenAI Project user role assignments API (OpenAPI) OpenAI Projects API (OpenAPI) OpenAI Realtime API (OpenAPI) OpenAI Responses API (OpenAPI) OpenAI Roles API (OpenAPI) OpenAI Skills API (OpenAPI) OpenAI Threads API (OpenAPI) OpenAI Uploads API (OpenAPI) OpenAI Usage API (OpenAPI) OpenAI User organization role assignments API (OpenAPI) OpenAI Users API (OpenAPI) OpenAI Vector stores API (OpenAPI) OpenAI Videos API (OpenAPI) OpenAI OpenAI API (OpenAPI)
Back to OpenAI · All Collections · GitHub

Work with this as data

Every collection here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for collections

4 MCP tools reach this
  • find_collectionsBrowse and filter every collection in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This collection 
curl "https://apis.io/api/v1/collections/postman-openai-chat-completions"
All collections 
curl "https://apis.io/api/v1/collections?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.