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Free LLM API Guides & Tutorials
Practical articles for developers — how to use free AI API keys, compare models, build LangChain apps, set up Open WebUI, and more.
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Tutorials
How to Use a Free LLM API Key with Cursor IDE (No Paid Plan Needed)
Exact steps to configure Cursor IDE with a custom OpenAI-compatible API key — get GPT-4o and Claude in Cursor for free.
Jun 15, 20256 min read
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Tutorials
Using LangChain with a Free LLM API Key — Full Setup Guide
Build LangChain pipelines and RAG applications with a free OpenAI-compatible API key — complete setup guide with working code.
Jun 5, 20258 min read
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Tutorials
How to Handle LLM API Rate Limits in Python (Retry Logic, Backoff, Fallback)
Production-ready Python patterns for handling 429 errors from any LLM API — exponential backoff, tenacity, key rotation, and model fallback strategies.
May 30, 20258 min read
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Tutorials
Build a Working AI Chatbot With Next.js and a Free LLM API Key (Zero Cost)
Full tutorial: build and deploy a streaming AI chatbot with Next.js 14 using a free OpenAI-compatible API key — includes frontend, API route, and Vercel deployment.
May 25, 202510 min read