OpenAI API Alternative: 18 Free OpenAI-Compatible LLM APIs in 2026
Find the best free OpenAI API alternative in 2026. Compare 18 OpenAI-compatible providers with free tiers. No credit card options, rate limits, and Iran access included. Switch without changing your SDK.
Quick answer: There are 18 free OpenAI-compatible API providers in this catalog. The best free OpenAI API alternatives are GitHub Models (no credit card, 150 RPD), Groq (30 RPM, fastest inference), and SambaNova Cloud (direct Iran access, 20 RPD). All use the same SDK — just change base_url and api_key.
Why Look for an OpenAI API Alternative?
Reasons developers seek OpenAI API alternatives:
- Cost: OpenAI's API has no permanent free tier (only $5 trial credit)
- Regional restrictions: OpenAI is not officially available in all countries
- Rate limits: Other providers offer higher free-tier limits
- Model diversity: Access models from different families (DeepSeek, Qwen, Mistral, Llama)
- Privacy: Some providers offer zero-retention policies
OpenAI-Compatible Providers (18 Total)
These providers support the OpenAI SDK format so you can switch with minimal code changes:
| Provider | Free Type | Rate Limit | Credit Card Required | Iran Access |
|---|---|---|---|---|
| GitHub Models | Free quota | 150 RPD | No (GitHub account) | ✅ Direct |
| Groq | Free quota | 30 RPM | No | ⛔ Blocked |
| SambaNova Cloud | Free quota | 20 RPD | No | ✅ Direct |
| SiliconFlow | Free models | 30 RPM | No | 🧾 Signup blocked |
| Mistral AI | Free quota | Model-dependent | No | ✅ Direct |
| Cloudflare Workers AI | Free quota | 10,000 neurons/day | No | ✅ Direct |
| Hugging Face | Monthly credit | $0.10/month | No | ✅ Direct |
| Kilo Gateway | Free models | 200 RPH | No (anonymous) | ✅ Direct |
| LLM7.io | Free models | 30 RPM | No (anonymous) | ✅ Direct |
| OpenCode Zen | Free models | Model-dependent | Yes | ✅ Direct |
| OpenRouter | Free models | 50 RPD | Yes | ⛔ Blocked |
| NVIDIA NIM | Free quota | Model-dependent | No | ❔ Unknown |
| OVHcloud | Free models | 2 RPM | No (anonymous) | ✅ Direct |
| Fireworks AI | Monthly credit | 10 RPM | Yes | ❔ Unknown |
| Agnes AI | Free models | 20 RPM | ❔ Unknown | ❔ Unknown |
| Aion Labs | Free quota | 15 RPM | No | ⛔ Blocked |
| FreeTheAI | Free models | 250 RPD | No | ❔ Unknown |
| Cerebras | Trial | 5 RPM | Yes | ⛔ Blocked |
How to Switch from OpenAI to a Free Alternative
The OpenAI SDK makes switching trivial. Change only the base_url and api_key:
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://models.inference.ai.azure.com", # GitHub Models
)
response = client.chat.completions.create(
model="gpt-4o-mini",
messages=[{"role": "user", "content": "Hello!"}],
)Cost Comparison: OpenAI vs Free Alternatives
| Service | 1M Input Tokens | 1M Output Tokens |
|---|---|---|
| OpenAI GPT-4o | $2.50 | $10.00 |
| GitHub Models (free) | $0.00 | $0.00 |
| Groq (free) | $0.00 | $0.00 |
| DeepSeek V4 Flash (free, OpenCode Zen) | $0.00 | $0.00 |
Frequently Asked Questions
What is the best free OpenAI API alternative?
GitHub Models is the best free OpenAI alternative because it offers 150 free requests per day, supports GPT-4o-mini and other models, and requires no credit card — only a GitHub account.
Are free OpenAI alternatives compatible with the OpenAI SDK?
Yes, 18 of 22 providers in this catalog are OpenAI-compatible. You can use the openai Python package, JavaScript openai SDK, or any OpenAI-compatible client with a simple base_url change.
Can I use free OpenAI alternatives for commercial projects?
Most free tiers allow commercial use. GitHub Models, Mistral AI, and Cloudflare Workers AI all permit commercial use. Always check the provider's terms of service.
Which free OpenAI alternatives work from Iran?
Cloudflare Workers AI, GitHub Models, Kilo Gateway, LLM7.io, Mistral AI, OVHcloud AI Endpoints, and SambaNova Cloud are all verified working from Iran directly.
Do I need a credit card for free OpenAI API alternatives?
Not for most providers. GitHub Models, Cloudflare Workers AI, Groq, Hugging Face, Kilo Gateway, LLM7.io, Mistral AI, and SambaNova Cloud all offer free access without a credit card.
Related Guides
- Free AI API guide — complete overview of free AI APIs
- Free LLM API list — full comparison of all free LLM APIs
- Free GPT API no credit card — GPT access without payment
- ChatGPT API alternatives — focused ChatGPT API comparison
Ready to Switch?
Browse all 22 providers in the interactive catalog and filter by OpenAI compatibility, Iran access, and free tier type to find your ideal OpenAI API alternative. Star the GitHub repository to support this project.