How much does the GPT-4o API cost?

GPT-4o costs $2.50 per 1M input tokens and $10.00 per 1M output tokens as of April 2026.

What is the cheapest AI API provider?

The cheapest AI API providers are typically open-source models like DeepSeek V3, Llama 3.1 8B, and Mistral Small 3.1 24B, which are free or cost fractions of a cent per 1M tokens.

How is AI API pricing calculated?

AI API pricing is typically charged per 1,000 tokens (1K tokens ≈ 750 words). Input tokens (your prompts) and output tokens (the AI's responses) usually have different rates.

What is the difference between open source and commercial AI models?

Open source AI models like Llama and Mistral are free to use and can be self-hosted. Commercial models like GPT-4o and Claude require API payment but offer managed infrastructure and often higher quality.

AI Model Price Calculator

Compare LLM API costs across 36 models from OpenAI, Anthropic, Google, Meta, DeepSeek, and more.

What is this tool?

When you use AI APIs like GPT-4o, Claude, or Gemini, you pay per token — roughly $0.001–$15 per 1,000 tokens depending on the model. A token is about 4 characters or 3/4 of a word. This calculator helps you estimate exactly how much your AI usage will cost before you write a single line of code.

Whether you are building an app, running a business, or just exploring AI costs — enter your expected input and output tokens above, and instantly compare prices across 36 models from every major provider.