I’m having a bit of trouble getting the openai-php client to work. In the example below I’ve made it very basic and am still getting a class not found error. Does anyone see anything off here?

<?php
require_once 'vendor/autoload.php';
use OpenAIClient;

$openai_token = 'sk-...';
$client = OpenAI::client($openai_token);

$result = $client->chat()->create([
    'model' => 'gpt-4',
    'messages' => [
        ['role' => 'user', 'content' => 'Hello!'],
    ],
]);

echo $result->choices[0]->message->content; // Hello! How can I assist you today?

The result is:

Fatal error: Uncaught Error: Class "OpenAI" not found in...

I’ve checked my Composer packages and it shows:

openai-php/client  0.8.5