ChatGPT API: Connecting and Using the OpenAI API

ChatGPT API: Complete Guide

OpenAI API provides access to GPT-4o, GPT-4o-mini, o1 for chatbots, content generation, and automation.

PHP Integration

composer require openai-php/client

<?php
$client = OpenAI::client($_ENV['OPENAI_API_KEY']);
$response = $client->chat()->create([
    'model'    => 'gpt-4o-mini',
    'messages' => [
        ['role' => 'system', 'content' => 'You are a support assistant.'],
        ['role' => 'user',   'content' => 'How do I add a domain in cPanel?'],
    ],
]);
echo $response->choices[0]->message->content;

Pricing (2025)