Testing OpenRouter API: Free AI Model Access

Learn how to test and use free AI models through OpenRouter's unified API.

curl -X POST https://openrouter.ai/api/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "google/gemini-2.0-flash-exp:free", "messages": [{"role": "user", "content": "Say hello in 3 languages"}] }' Enter fullscreen mode Exit fullscreen mode Python Integration import requests import os OPENROUTER_URL = " https://openrouter.ai/api/v1/chat/completions " def test_openrouter ( prompt: str, model: str = " google/gemini-2.0-flash-exp:free " ) -> str: """ Test OpenRouter API with a prompt. """ headers = { " Authorization ": f " Bearer { os. getenv ( ' OPENROUTER_API_KEY ' ) } ", " Content-Type ": " application/json " } data = { " model ": model, " messages ": [{ " role ": " user ", " content ": prompt }], " temperature ": 0.7, " max_tokens ": 150 } response = requests. post ( OPENROUTER_URL, headers = headers, json = data, timeout = 30 ) if response. status_code == 200: return response. json ()[ " choices " ][ 0 ][ " message " ][ " content " ] else: raise Exception ( f " Error: { response. status_code } - { response. text } " ) # Test it if __name__ == " __main__ ": prompt = " Explain the difference between REST and GraphQL in 2 sentences " try: result = test_openrouter ( prompt ) print ( f " Q: { prompt } " ) print ( f " A: { result } " ) except Exception as e: print ( f " Error: { e } " ) Enter fullscreen mode Exit fullscreen mode Free Models Available OpenRouter offers many free models (look for:free suffix):

OpenRouter provides a unified interface to dozens of free AI models. Perfect for testing, learning, and building AI-powered applications without API costs.