ChatGPT API Alternative: 18 Free OpenAI-Compatible APIs in 2026
Find the best free ChatGPT API alternative in 2026. Compare 18 OpenAI-compatible providers with free tiers. GitHub Models, Groq, Mistral, and more. No credit card options available.
Quick answer: The best free ChatGPT API alternatives are GitHub Models (uses same GPT models, free, no credit card), Groq (30 RPM, fastest inference), and SambaNova Cloud (verified Iran access). All 18 alternatives in this catalog use the OpenAI SDK format — just change your base_url.
Why You Might Need a ChatGPT API Alternative
Several reasons to consider alternatives to the official ChatGPT API:
- Pricing: ChatGPT API has no permanent free tier
- Regional access: Not available in all countries including Iran
- Rate limits: Free alternatives may offer higher limits
- Model diversity: Access models from DeepSeek, Mistral, Qwen, Llama and more
- Privacy: Some alternatives offer stronger data protection
Best ChatGPT API Alternatives by Use Case
Best Overall: GitHub Models
- Free GPT-4o-mini and GPT-4o access
- 150 requests per day
- No credit card required (GitHub account only)
- OpenAI-compatible SDK
Best for Speed: Groq
- 30 RPM rate limit
- Ultra-low latency inference
- Free registration, no credit card
- Runs Llama 3, Mixtral, Gemma models
Best for Iran Users: Cloudflare Workers AI
- Verified direct Iran access
- 10,000 neurons/day free quota
- Multiple model families
- No credit card required
Best Anonymous Option: LLM7.io
- 30 RPM without registration
- Use "unused" as API key
- Multiple model selectors (default, fast, pro)
- Verified Iran access
Quick Comparison Table
| Alternative | Free Model Access | RPM | RPD | No Credit Card | Iran Access |
|---|---|---|---|---|---|
| GitHub Models | GPT-4o, GPT-4o-mini | 15 | 150 | ✅ | ✅ Direct |
| Groq | Llama 3, Mixtral | 30 | 1000 | ✅ | ⛔ Blocked |
| Cloudflare Workers AI | Multiple | — | 10K neurons | ✅ | ✅ Direct |
| SambaNova Cloud | Llama, Qwen | 20 | 20 | ✅ | ✅ Direct |
| Mistral AI | Mistral models | — | — | ✅ | ✅ Direct |
| LLM7.io | Multiple models | 30 | — | ✅ (anon) | ✅ Direct |
| Kilo Gateway | Multiple models | — | 200 RPH | ✅ (anon) | ✅ Direct |
| Hugging Face | Multiple models | — | $0.10/mo | ✅ | ✅ Direct |
Setting Up a ChatGPT API Alternative
All OpenAI-compatible providers work with the same code pattern:
from openai import OpenAI
# Just change these two lines for any provider
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://PROVIDER_URL/v1",
)
response = client.chat.completions.create(
model="MODEL_ID",
messages=[{"role": "user", "content": "Hello!"}],
)Frequently Asked Questions
What is the best free ChatGPT API alternative?
GitHub Models is the best free ChatGPT API alternative because it provides access to the same GPT-4o and GPT-4o-mini models for free with 150 requests per day and no credit card required.
Are free ChatGPT API alternatives compatible with existing code?
Yes, 18 providers in this catalog are OpenAI-compatible. You only need to change the base_url and api_key in your existing code. No SDK changes needed.
Which ChatGPT alternatives work from Iran?
Cloudflare Workers AI, GitHub Models, Hugging Face, Kilo Gateway, LLM7.io, Mistral AI, OVHcloud, and SambaNova Cloud all have verified direct access from Iran.
Can I use ChatGPT API alternatives for commercial projects?
Most free tiers permit commercial use. Check each provider's terms of service. GitHub Models, Cloudflare Workers AI, and Mistral AI all allow commercial use on free tiers.
Do ChatGPT API alternatives require billing information?
Not in most cases. GitHub Models, Cloudflare Workers AI, Groq, Hugging Face, Kilo Gateway, LLM7.io, Mistral AI, and SambaNova Cloud do not require a credit card for free tier access.
Related Guides
- Free AI API guide — complete overview of free AI APIs
- Free LLM API list — full comparison of all free LLM APIs
- AI API Iran — providers verified working from Iran
- OpenAI API alternatives — broader OpenAI-compatible options
Complete Provider List
Browse all 22 providers in the interactive catalog with filtering by ChatGPT API compatibility, free tier type, Iran access status, and capabilities. Star the GitHub repository to support this project.