Frontier · language

Use Claude Sonnet 4.5 with PHP

Updated 2026-05-21 · By XALEN

How to use Claude Sonnet 4.5 (Frontier, ~600B) with PHP. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Claude Sonnet 4.5

~600B · 200K context · $0.03 input

Framework

PHP

language · composer require openai-php/client

1. Install

composer require openai-php/client

2. Code

<?php
require 'vendor/autoload.php';

$client = OpenAI::factory()
    ->withApiKey('xln_test_YOUR_KEY')
    ->withBaseUri('https://api.xalen.io/v1')
    ->make();

$response = $client->chat()->create([
    'model' => 'claude-sonnet-4-5',
    'messages' => [
        ['role' => 'user', 'content' => 'Hello from PHP!']
    ]
]);

echo $response->choices[0]->message->content;

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Last updated: 2026-05-21