API Reference

With one OhMyGPT key you can call every model in the catalog through the OpenAI, Anthropic, or Gemini protocol. Keep the SDK your project already uses and change two settings: the base URL and the key. Create a key at API keys.

Test your integration for free with ohmygpt/mock. It answers on every chat endpoint, streaming or not:

curl https://api.ohmygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "ohmygpt/mock", "messages": [{"role": "user", "content": "ping"}]}'

{
  "id": "chatcmpl-ohmygpt-mock",
  "object": "chat.completion",
  "model": "mock",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "This is a mock reply from OhMyGPT. Your integration works; switch to a real model when ready."
      }
    }
  ],
  "usage": { "prompt_tokens": 15, "completion_tokens": 17, "total_tokens": 32 }
}

When it works, change model to a real model ID.

Chat protocolsCopy Anchor Link

Every chat model answers on all four protocols. Use the one your SDK or tool speaks:

Authorization: Bearer and x-api-key work on every endpoint, so each SDK's default header is accepted. x-goog-api-key works on the Gemini endpoints. Send the key in one header only.

Protocols shows what you send and get back when you call a model on each protocol.

Other endpointsCopy Anchor Link

For these endpoints, use a model that lists the endpoint in GET /v1/models, as shown below.

Find a model for an endpointCopy Anchor Link

Look model IDs up instead of hard-coding them; the catalog changes often. Each entry in GET /v1/models lists the endpoints that model accepts in protocols:

curl -s https://api.ohmygpt.com/v1/models \
  | jq -r '.data[] | select(.id | test("claude-haiku")) | [.id, ([.protocols[].path] | join(" "))] | @tsv'

anthropic/claude-haiku-4-5	/v1/chat/completions /v1/responses /v1/messages /v1/models/{id}:generateContent
anthropic/claude-haiku-5-5	/v1/chat/completions /v1/responses /v1/messages /v1/models/{id}:generateContent

Filter by product type with ?service=, for example embedding, rerank, image, tts, stt, moderation, or ocr:

curl -s "https://api.ohmygpt.com/v1/models?service=embedding" | jq -r '.data[].id'

Prices for every model are on Models.

The charge on every responseCopy Anchor Link

Every response tells you exactly what the request cost:

Your full history is in Usage.