freellmpool › guide

Free alternatives to the OpenAI API

The cheapest alternative to the OpenAI API is the free tier that many providers already give away — Groq, Cerebras, NVIDIA, Google Gemini, OpenRouter, Cloudflare, Mistral and Cohere each offer one. The catch is that each has its own SDK, rate limit, and daily cap. The simplest way to use them is freellmpool, an open-source tool that pools all of those free tiers behind a single OpenAI-compatible endpoint, with automatic failover, and works with no API key to start.

pip install freellmpool
export OPENAI_BASE_URL=http://localhost:8080/v1   # after: freellmpool proxy
# your existing OpenAI SDK code now runs on free models, unchanged

The options, honestly

Option	Free?	API key?	OpenAI-compatible
Provider free tiers (Groq, Cerebras, …)	Yes, per-provider limits	Usually yes	Mostly
freellmpool (pools all of them)	Yes	No to start	Yes (drop-in)
OpenRouter	A few rate-limited free models	Yes	Yes
Local models (Ollama, llama.cpp)	Yes (your hardware)	No key	Via a wrapper

Why pool the free tiers instead of picking one

• No single free tier has enough daily capacity for real use; together they do.
• freellmpool fails over when one provider is rate-limited, so you're not stuck on a 429.
• Your code keeps using the OpenAI SDK — only the base URL changes.
• It also speaks the Anthropic API, so Claude Code / Codex / Aider run on free models too — see the coding-agents guide.

Limits to know

Free-tier models are smaller than GPT-class frontier models — great for drafting, classification, summarization, and everyday coding, not the hardest reasoning. Daily limits reset at UTC midnight.

FAQ

Is there a free OpenAI API key?

OpenAI itself doesn't offer a free API tier, but several other providers do, and freellmpool lets you use them through the same OpenAI-compatible interface — two of them (Pollinations, OVHcloud) need no key at all, so pip install freellmpool && freellmpool ask "..." works immediately.

Can I keep my existing OpenAI code?

Yes. Point OPENAI_BASE_URL at the local freellmpool proxy; the SDK calls are unchanged and common model names like gpt-4o-mini are mapped to a free equivalent.

Part of freellmpool (MIT, free, open source). Updated 2026-06-03.