A Google Gemini API API alternative with one key for 50+ models

What is Google Gemini API?

Google offers Gemini models to developers through the Gemini API in Google AI Studio, with an OpenAI-compatibility layer.

What developers use it for

• Apps built on Gemini models
• Teams inside the Google ecosystem

Things to consider

• Only Google's models are available.
• Rates and free-tier limits are listed on Google's pricing page.

Where Somnus fits

Use Gemini through Somnus next to Claude, GPT and DeepSeek, paid from the same prepaid balance.

Every Somnus top-up is credited at 2× or more, and usage is billed at each model's list price, so a dollar of credit buys at least two dollars of usage.

Switching from Google Gemini API: change two settings

from openai import OpenAI
import os

client = OpenAI(
    api_key=os.environ["SOMNUS_API_KEY"],
    base_url="https://gateway-production-c837.up.railway.app/v1",
)

resp = client.chat.completions.create(
    model="claude-sonnet-5",
    messages=[
      {"role": "user", "content": "Hello"}
    ],
)
print(resp.choices[0].message.content)

If you already use Google Gemini API's OpenAI-compatible endpoint, only base_url, the key and the model name change.

Questions

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