Complete AI API Tutorial 2026: Build Your First AI App in 10 Minutes (Python + JS)

Complete AI API Tutorial 2026: Build Your First AI App in 10 Minutes This tutorial gets you from zero to a working AI-powered app in 10 minutes. We'll use NexaAPI — an OpenAI-compatible gateway that gives you access to GPT-4.1, Claude Sonnet 4.6, Gemini 3.1 Pro, and more at 1/5 the official price . 📧 Get your API key: frequency404@villaastro.com 🌐 Platform: https://ai.lmzh.top Why NexaAPI? Model Official Price NexaAPI Price Claude Sonnet 4.6 $3.00/M input ~$0.60/M input GPT-4.1 $2.00/M input ~$0.40/M input Gemini 3.1 Pro $2.00/M input ~$0.40/M input Same models. Same quality. 80% cheaper. One line of code change. Part 1: Python Tutorial Install pip install openai Basic Chat Completion from openai import OpenAI client = OpenAI ( api_key = " YOUR_NEXAAPI_KEY " , base_url = " https://ai.lmzh.top/v1 " # ← only change from OpenAI ) response = client . chat . completions . create ( model = " gpt-4.1 " , # or "claude-sonnet-4-6", "gemini-3.1-pro" messages = [ { " role " : " system " , " conte