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.
How to Build a Telegram Bot with a Free LLM API in Python (2025)
Step-by-step tutorial: build a fully working AI-powered Telegram bot using Python and a free LLM API key — no paid subscriptions, deployed in under 30 minutes.
How to Use a Free LLM API in Google Sheets (AI in Spreadsheets — No Code)
Add AI superpowers to Google Sheets using a free LLM API key — summarize text, classify data, generate content, and analyze rows with a custom formula.
How to Build a Discord AI Bot with a Free LLM API (Python + discord.py)
Build a fully working Discord AI bot with conversation memory, slash commands, and model switching — using a free LLM API key and discord.py.
Using LLM APIs for Data Analysis in Python: A Practical Guide (2025)
Use free LLM APIs to analyze datasets, generate insights, write pandas code, explain results, and build natural language query interfaces for your data.
How to Build an AI Agent from Scratch in Python (2025 Guide)
Build a real AI agent with tools, memory, and multi-step reasoning in Python — using a free LLM API key. Full working code, no fluff.
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.
My AI Coding Workflow in 2025: How I Ship 2x Faster Using Free LLM APIs
A real developer workflow using free LLM APIs across every stage of the development process — planning, coding, review, testing, and debugging.
Prompt Engineering for Developers: 10 Techniques That Actually Work in 2025
The prompt engineering techniques that produce consistent, measurable improvements — chain of thought, few-shot, role prompting, self-consistency, and more. With real code examples.
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.
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.
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.