LLM Cost Tracking Made Simple

Call our REST API, pass in your model, and instantly know what your request costs. Compatible with ChatGPT, Gemini, and soon every major LLM.

Send a request like this

POST https://llm-cost-calculator.pages.dev/api/how-much
Content-Type: application/json

{
  "vendor": "openai",
  "model": "gpt-4.1",
  "specs": {
    "tier": "Standard"
  },
  "tokens": {
    "input": 123000,
    "output": 456000
  }
}

…and you’ll instantly get the cost in dollars.

{
	"inputCost": 0.00246,
	"outputCost": 0.036480000000000005,
	"totalCost": 0.03894
}

Available LLMs

Currently only text-based LLMs are supported.

VendorModelsValues for 
specs
openaigpt-5, gpt-5-mini, gpt-5-nano, gpt-4.1, gpt-4.1-mini, gpt-4.1-nano, gpt-4o, gpt-4o-2024-05-13, gpt-4o-mini, o1, o1-pro, o3-pro, o3, o3-deep-research, o4-mini, o4-mini-deep-research, o3-mini, o1-mini, computer-use-preview, gpt-3.5-turbo-0125
{
  tier: 'Batch' | 'Flex' | 'Standard' | 'Priority';
  cachedInput: boolean | false;
}