A OpenAI API alternative with one key for 50+ models

What is OpenAI?

OpenAI offers its GPT models to developers through the OpenAI API platform, billed per token under an OpenAI account.

What developers use it for

• Chat assistants and copilots built on GPT models
• Tool and function calling inside products
• Teams already standardised on the OpenAI SDKs

Things to consider

• Access is limited to OpenAI's own models, so using Claude or Gemini means a second account and a second bill.
• Prices are published on OpenAI's pricing page and change as new models ship — check them directly.

Where Somnus fits

Somnus accepts the same OpenAI SDKs: change the base URL and key, and GPT, Claude, Gemini, DeepSeek and more share one 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 OpenAI: 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 OpenAI's OpenAI-compatible endpoint, only base_url, the key and the model name change.

Questions

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