import requests import os # Configuration OPENROUTER_URL = "https://openrouter.ai/api/v1/chat/completions" MODEL = "google/gemini-2.0-flash-exp:free" # Free tier model  def call_gemini(prompt: str, api_key: str, max_tokens: int = 200) -> str: """Call the free Gemini API via OpenRouter.""" headers = { "Authorization": f"Bearer {api_key}", "Content-Type": "application/json" } data = { "model": MODEL, "messages": [{"role": "user", "content": prompt}], "temperature": 0.7, "max_tokens": max_tokens } response = requests.post(OPENROUTER_URL, headers=headers, json=data) if response.status_code == 200: return response.json()["choices"][0]["message"]["content"] else: raise Exception(f"API Error: {response.status_code} - {response.text}") # Usage if __name__ == "__main__": api_key = os.getenv("OPENROUTER_API_KEY") if not api_key: print("Set OPENROUTER_API_KEY environment variable") exit(1) prompt = "Write a haiku about Python programming" try: result = call_gemini(prompt, api_key) print(f"Prompt: {prompt}") print(f"Response: {result}") except Exception as e: print(f"Error: {e}") 

import requests import os def chat_with_gemini(api_key: str): """Interactive chat with Gemini.""" conversation = [] url = "https://openrouter.ai/api/v1/chat/completions" headers = { "Authorization": f"Bearer {api_key}", "Content-Type": "application/json" } print("Gemini Chat (type 'quit' to exit)") print("-" * 40) while True: user_input = input("You: ") if user_input.lower() in ('quit', 'exit', 'q'): break conversation.append({"role": "user", "content": user_input}) data = { "model": "google/gemini-2.0-flash-exp:free", "messages": conversation, "temperature": 0.7, "max_tokens": 300 } response = requests.post(url, headers=headers, json=data) if response.status_code == 200: assistant_msg = response.json()["choices"][0]["message"]["content"] conversation.append({"role": "assistant", "content": assistant_msg}) print(f"Gemini: {assistant_msg}") else: print(f"Error: {response.status_code}") print("-" * 40) if __name__ == "__main__": api_key = os.getenv("OPENROUTER_API_KEY") chat_with_gemini(api_key) 

import time def robust_call(prompt: str, api_key: str, retries: int = 3) -> str: """Call API with exponential backoff retry.""" for attempt in range(retries): try: return call_gemini(prompt, api_key) except Exception as e: if "429" in str(e): # Rate limited  wait = 2 ** attempt print(f"Rate limited. Waiting {wait}s...") time.sleep(wait) else: raise raise Exception("Max retries exceeded")