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What is ModelStack?

ModelStack is a unified API gateway for AI models. Instead of managing separate API keys, SDKs, and billing accounts for each AI provider, ModelStack gives you one API, one key, and one bill.

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Key Features

Unified API

Access Claude, GPT, Gemini, and more through a single OpenAI-compatible endpoint. Switch models by changing one parameter.

40+ Models

Anthropic Claude (Opus, Sonnet, Haiku), OpenAI GPT-4o, o1, o3, o4, and Google Gemini 2.5 — all available instantly.

Simple Billing

Subscription plans with auto-refilling credits every 5 hours. Purchase lifetime credits for additional usage with plan-based discounts.

Dashboard & Analytics

Real-time usage analytics, request logs, model breakdown charts, and API key management from a single dashboard.

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How It Works

  1. Sign up at modelstack.cc and choose a plan
  2. Create an API key from your dashboard
  3. Make requests to api.modelstack.cc using any OpenAI-compatible SDK
  4. Switch models freely — just change the model parameter
curl https://api.modelstack.cc/v1/chat/completions \
  -H "Authorization: Bearer your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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Why ModelStack?

  • No provider lock-in — switch between Anthropic, OpenAI, and Google models with zero code changes
  • OpenAI-compatible — works with existing OpenAI SDKs in Python, Node.js, and any language
  • Predictable costs — subscription credits refill every 5 hours; lifetime credits never expire
  • Built for developers — simple REST API, streaming support, comprehensive error codes