Migrate from OpenRouter

Switching takes two changes: the base URL and the key. Your OpenAI SDK code, streaming, tool calls, structured output, the provider object and your app attribution headers keep working as they are. Every response then tells you its exact cost, and the free ohmygpt/mock model lets you check the switch before you spend anything.

1. Change the base URL and keyCopy Anchor Link

import os

from openai import OpenAI

client = OpenAI(
    base_url="https://api.ohmygpt.com/v1",
    api_key=os.environ["OHMYGPT_API_KEY"],
)

completion = client.chat.completions.create(
    model="ohmygpt/mock",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)

This is a mock reply from OhMyGPT. Your integration works; switch to a real model when ready.

The mock is free and is available once your account has been topped up. When it answers, your URL and key are right.

2. Set the model IDsCopy Anchor Link

Model IDs use the same creator/model form. Many are identical; others use a different creator name or a hyphen in the version:

List every ID with:

curl -s https://api.ohmygpt.com/v1/models | jq -r '.data[] | select(.available) | .id'

Prices are on the Models page. If an ID is off, the response is a 404 that names it:

{
  "error": {
    "message": "The model `anthropic/claude-sonnet-4.6` does not exist. List available models with `GET /v1/models`.",
    "type": "not_found_error",
    "param": "model",
    "code": "model_not_found"
  }
}

What keeps workingCopy Anchor Link

• The provider object on Chat Completions and Responses, with order, only, ignore and sort (price, latency or throughput). Use the provider slugs that each model lists under providers[].provider in GET /v1/models. See Provider Routing.
• App attribution headers: HTTP-Referer, X-OpenRouter-Title (or X-Title) and X-OpenRouter-Categories are read as they are. See App Attribution.
• Streaming, tool calls and structured output (response_format with a JSON schema) in the standard OpenAI shapes.
• Usage in every non-streaming response. Chat Completions streams report usage when you set "stream_options": {"include_usage": true}, as on OpenAI.

Update these if your code uses themCopy Anchor Link

Check the cost of each requestCopy Anchor Link

Every response carries X-Request-ID. Non-streaming responses also carry X-Cost-Credits, the exact charge in Credits; streams send it as an SSE comment line : x-cost-credits: N before the final event. Usage lists every request with its cost, and Costs explains Credits.

Use the Anthropic and Gemini SDKs tooCopy Anchor Link

The same key also works with the Anthropic Messages API at /v1/messages and the Gemini API at /v1/models/{model}:generateContent. Code written for Anthropic's or Google's SDK can call OhMyGPT without changing format. The protocol table lists each SDK's base URL.