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.
Best Free Embedding APIs for RAG Applications in 2025
Build RAG (Retrieval-Augmented Generation) pipelines for free — a comparison of the best free embedding APIs with code examples for vector search and semantic similarity.
Grok API Free: How to Access xAI Grok-4 Without Paying (2025)
xAI's Grok-4 is one of the most capable models available. Here's how to get free Grok API access today — with Python and JavaScript examples.
Mistral AI API Free Tier: Complete Guide for Developers (2025)
Mistral AI offers genuinely free API access to Mistral 7B and Codestral. Here's the full setup guide with Python examples and a comparison with GPT-4o.
How to Get a Free GPT-4 API Key Without a Credit Card in 2025
Step-by-step guide to accessing GPT-4, GPT-4o, and o3 through a free OpenAI-compatible API — no credit card, no signup, working code included.
Free LLM API for Beginners: Zero to Your First AI API Call in 10 Minutes
Never made an API call before? This beginner guide walks you through using a free LLM API step by step — in Python, JavaScript, and with no code at all.
How to Get a Free Claude API Key (Claude Opus & Sonnet Access in 2025)
Access Anthropic's Claude Opus 4 and Claude Sonnet 4 for free — no Anthropic account needed. Full Python and JS examples included.
Best Free AI APIs in 2025 With No Credit Card Required
Complete list of AI APIs you can use right now for free — no credit card, no signup friction. Includes rate limits, model quality, and OpenAI compatibility for each.
DeepSeek R1 API Tutorial: How to Use the Best Free Reasoning Model
DeepSeek R1 rivals o3 on math and coding at a fraction of the cost — or free via FreeLLMKeys. Full API tutorial with Python examples and benchmark results.