# ChatGPT - ChatGPT (GPT-5) with Web Access (Unofficial)

> Fast and reliable unofficial ChatGPT API providing OpenAI's cutting-edge GPT-5 model with advanced reasoning and web access.

## Overview

ChatGPT API is a fast and reliable unofficial ChatGPT API providing OpenAI's GPT-5 model with advanced reasoning and web access. It returns AI responses as structured JSON via REST.

Who is this API for: developers building AI assistants, chatbots, content generation, and research tools.

What it returns: ChatGPT chat completions with advanced reasoning and web access.

Need help integrating? Contact support@openwebninja.com.
For high volume / large scale plans, please contact support@openwebninja.com.

## Endpoints

### POST /chat - Chat
Chat with OpenAI ChatGPT with support for continuous conversation and markdown/plain-text.
Full URL: `https://api.openwebninja.com/chatgpt/chat`

## Base URL and Authentication

- Base URL: `https://api.openwebninja.com/chatgpt`
- Auth: API key in the `x-api-key` header. Get a key by subscribing (free tier available) at https://app.openwebninja.com/api/chatgpt

## Topics

chatgpt api, openai api, gpt-5 api, ai chat api, llm api, chatbot api, ai assistant api, generative ai api, conversational ai api

## Links

- API page: https://www.openwebninja.com/api/chatgpt
- Get an API key / subscribe: https://app.openwebninja.com/api/chatgpt
- Pricing & plans: https://app.openwebninja.com/api/chatgpt/pricing
- Website: https://www.openwebninja.com
- OpenAPI spec: https://openwebninja.s3.us-east-1.amazonaws.com/portal/openapi/chatgpt.yaml
- Support: support@openwebninja.com

_Last updated: 2026-05-27_