Compare LLM token costs across 350+ models with OpenRouter

This n8n template lets you run prompts against 350+ LLM models and see exactly what each request costs with real-time pricing from OpenRouter

Use cases are many: Compare costs across different models, plan your AI budget, optimize prompts for cost efficiency, or track expenses for client billing!

Good to know

• OpenRouter charges a platform fee on top of model costs. See OpenRouter Pricing for details.
• You need an OpenRouter account with API credits. Free signup available with some free models included.
• Pricing data is fetched live from OpenRouter's API, so costs are always up-to-date.

How it works

1. All available models are fetched from OpenRouter's API when you start.
2. You select a model and enter your prompt via the form (or just use the chat).
3. The prompt is sent to OpenRouter and the response is captured.
4. Token usage (input/output) is extracted from the response using a LangChain Code node.
5. Real-time pricing for your selected model is fetched from OpenRouter.
6. The exact cost is calculated and displayed alongside your AI response.

How to use

• Chat interface: Quick testing - just type a prompt and get the response with costs.
• Form interface: Select from all available models via dropdown, enter your prompt, and get a detailed cost breakdown.
• Click "Show Details" on the result form to see the full breakdown (input tokens, output tokens, cost per type).

Requirements

• OpenRouter account with API key (Get one here)

Customising this workflow

• Add a database node to log all requests and costs over time
• Connect to Google Sheets for cost tracking and reporting
• Extend with LLM-as-Judge evaluation to also check response quality