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OpenRouter

OpenRouter provides unified API access to multiple AI models, including free and pay-as-you-go options for popular LLMs. · OpenRouter · AI

Overview

OpenRouter offers a unified API for accessing multiple AI models, making it easy to experiment and prototype with free-tier LLMs.

Good fit

Use OpenRouter when you want to access multiple AI models through a single API with a free tier for experimentation or prototyping.

  • prototyping
  • model evaluation
  • student projects

Not a fit

Avoid if you need guaranteed access to premium models or require strict SLAs for production workloads.

  • need enterprise SLAs
  • require specific premium models
  • need high-volume production use
Quickstart · 5 steps
  1. Sign up for a free OpenRouter account.
  2. Obtain your API key from the dashboard.
  3. Review the list of free models and their limits.
  4. Integrate the OpenRouter API into your application using the provided endpoint.
  5. Monitor your usage in the dashboard to stay within free tier limits.

Other free ai options

2,000 code completions per month · 50 chat requests per month (including Copilot Edits) · Agent mode, CLI, and MCP servers included with limited usage
Billing risk: None
No card
Google Cloud · AI
Sessions run up to 12 hours, depending on availability · GPU/TPU access heavily restricted on the free tier · Exact resource limits are not published and vary over time
Billing risk: None
No card
Google Cloud · AI
Free input and output tokens on supported models · Limited access to certain models · 5,000 free Google Search grounding requests/month, shared across Gemini 3.x models
Billing risk: None
No card
Hugging Face · AI
Unlimited public repos (best-effort free storage) · 100GB private storage · Storage limits apply across models, datasets, and buckets
Billing risk: None
No card