API Overview

Model Gate provides one authenticated gateway for Anthropic- and OpenAI-compatible clients.

Base URLs

Anthropic-compatible: https://api.model-gate.com
OpenAI-compatible:    https://api.model-gate.com/v1

OpenAI Chat Completions request

curl https://api.model-gate.com/v1/chat/completions \
  -H "Authorization: Bearer mg_live_..." \
  -H "Content-Type: application/json" \
  -d '{"model":"ch-47","messages":[{"role":"user","content":"Hello"}]}'

OpenAI Chat Completions response

{
  "id": "chatcmpl_example",
  "object": "chat.completion",
  "model": "claude-opus-4.7",
  "choices": [{"index":0,"message":{"role":"assistant","content":"Hello!"},"finish_reason":"stop"}],
  "usage": {"prompt_tokens":8,"completion_tokens":3,"total_tokens":11}
}

Anthropic Messages request

curl https://api.model-gate.com/v1/messages \
  -H "x-api-key: mg_live_..." \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-sonnet-4.6","max_tokens":256,"messages":[{"role":"user","content":"Hello"}]}'

Anthropic Messages response

{
  "id": "msg_example",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-4.6",
  "content": [{"type":"text","text":"Hello!"}],
  "usage": {"input_tokens":8,"output_tokens":3}
}

Models and personalized prices

GET /v1/models returns canonical model IDs, enabled aliases, capabilities, actual account-debit rates, official catalog rates, and effective usage-cost rates for the authenticated key.

Settlement

The account balance is debited by cost. API-key and group resettable limits are incremented by usage_cost. These values can differ because each key or group can select user_price or official_price and a multiplier.