TL;DR
A free API Key lets you test strong AI models without paying first or burning credits during agent tasks. This guide shows 13 platforms where you can get one and start building faster.
You’ll learn how to generate API keys from NVIDIA NIM, GitHub Models, OpenCode, OpenRouter, Google AI Studio, Mistral, Cerebras, Groq, Kilocode, Cohere, Vercel, Cloudflare Workers AI, and Ollama Cloud.
Each platform has different models, limits, and setup steps. Some are best for coding agents. Some are better for Gemini, Mistral, open-source models, or fast inference.
Key points
Important fact: OpenCode gives around 200 requests every 5 hours on its free tier.
Common mistake: Don’t connect a key to an agent before checking rate limits.
Practical takeaway: Start with one platform, test one model, then track usage.
Table of Contents
How do you usually test AI models?
Introduction
Your AI agent is not “free” once it starts calling APIs.
You may ask Claude Code, OpenCode, OpenClaw, or Hermes to fix one feature, and it may read files, test, fail, retry, and call the model again. Your credits can disappear before the task is even finished.
That is why I keep a backup list of free API Key sources. In this guide, I’ll show you:
What you’ll get | Why it matters |
|---|---|
Platforms with free AI API keys | Use models without paying first |
Free models from NVIDIA, GitHub, Google, Mistral, OpenRouter, and more | Test different models for coding, chat, image, and agents |
Step-by-step API key setup | Know exactly where to click |
Rate limits and free credit notes | Avoid wasting requests too fast |
By the end, you’ll know where to get a free API Key, which models are worth trying, and how to run powerful AI tools without burning through your budget.
1. NVIDIA NIM for Open Models
NVIDIA NIM is one of the first places I would check when I need a free API Key for strong open models.
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