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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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API Guides
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.
Jun 20, 20257 min read
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API Guides
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.
Jun 12, 20257 min read