Why Choose OpenRouter's Free Tier?

OpenRouter is an aggregator API gateway that integrates models from OpenAI, Anthropic, Google, Meta, and more. For developers, its Free Tier is an excellent way to obtain AI tokens because:

  • No credit card required: Register and use some free models immediately.
  • Unified interface: One API key for multiple models.
  • Free credits refresh periodically: Usually monthly.
  • Supports various free models: Such as GPT-4o mini, Claude 3 Haiku, Llama 3, etc.

Step-by-Step Guide

1. Sign Up

Visit the OpenRouter website (https://openrouter.ai) and click "Sign Up" in the top right corner. Register with email or GitHub account.

2. Get API Key

After logging in, go to the "Keys" page, click "Create Key" to generate an API key. Save it securely.

3. Check Free Credits

On the "Account" page, you can see the remaining free credits. OpenRouter typically offers new users about $1 in free credits, and there is a daily limit on free model calls (e.g., 50 requests per day).

4. Call Free Models

Set up the API endpoint in your code:

```python

import openai

openai.api_base = "https://openrouter.ai/api/v1"

openai.api_key = "YOUR_API_KEY"

response = openai.ChatCompletion.create(

model="openai/gpt-4o-mini", # or other free models

messages=[{"role": "user", "content": "Hello!"}]

)

print(response)

```

5. Monitor Usage

On the "Usage" page, you can check daily call counts and remaining credits to avoid overages.

Precautions

  • Limited free credits: Usually reset monthly, but amounts may vary. Check the official site.
  • Rate limits: Free models may have per-minute request limits (e.g., 20 requests/min).
  • Model availability: The free model list changes dynamically; check regularly.
  • Do not abuse: Violating terms of service may result in account suspension.

Use Cases

  • Personal developer testing and prototyping.
  • Student projects or learning purposes.
  • Light production applications (mind the limits).

How to Maximize Free Credits?

  • Combine: Use OpenRouter alongside other free tiers (e.g., Google AI Studio).
  • Cache results: Reduce repeated calls.
  • Use small models: Free models are usually smaller versions, suitable for simple tasks.

FAQ

Q: Do free credits expire?

A: They usually reset monthly; unused credits do not roll over.

Q: Do I need a credit card?

A: No for the free tier, but yes for paid plans.

Q: Which free models are supported?

A: Check the model list on OpenRouter's website and filter by "Free" tag.