Frontier · language

Use Claude Sonnet 4.5 with cURL

Updated 2026-05-21 · By XALEN

How to use Claude Sonnet 4.5 (Frontier, ~600B) with cURL. 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

cURL

language · No installation needed

1. Install

No installation needed

2. Code

curl https://api.xalen.io/v1/chat/completions \
  -H "Authorization: Bearer xln_test_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Claude Sonnet 4.5 with Other Frameworks

Python JavaScript React Next.js Flask FastAPI Django Express.js

Other Models with cURL

Vedika Standard Vedika Fast Vedika Pro Ultra Vedika Vision Vedika Code Vedika Translate

200+ models. One API. Works with any framework.

Get API Key

Last updated: 2026-05-21