LLM API Cost Calculator (2026)
Estimate monthly and yearly token costs for GPT-5.5, Claude Opus 4.8, Gemini 3, Grok 4.3 and DeepSeek V4 — then run any of them, no code, in Google Sheets with GPT for Sheets.
Your usage
Estimated API cost
How LLM API pricing works
Most providers bill per token (~¾ of a word), with separate input and output rates. Monthly cost = requests × (avg input tokens × input price + avg output tokens × output price). Reasoning and "Pro" models cost far more per token, while small models (GPT-4o-mini, Gemini Flash, DeepSeek V4) are a fraction of the price.
With GPT for Sheets you can run all of them — =GPT(), =CLAUDE(), =GEMINI(), =GROK(), =DEEPSEEK() — directly in cells. Bring your own key and pay these token rates, or use an included-credits plan and skip token accounting entirely.
FAQ
How do I calculate LLM API cost?
Multiply requests by (average input tokens × input price + average output tokens × output price), using each model's per-1M-token rates. This calculator does it live as you adjust the inputs.
Which model is cheapest?
Small/efficient models like GPT-4o-mini, Gemini 3 Flash, and DeepSeek V4 are typically 10–50× cheaper per token than flagship "Pro" reasoning models — pick the smallest model that meets your quality bar.
Can I use these models in Google Sheets?
Yes — GPT for Sheets runs GPT-5.5, Claude Opus 4.8, Gemini 3, Grok 4.3, DeepSeek V4, Mistral, Perplexity, and any model via OpenRouter, with simple formulas.
Can I avoid managing API keys and tokens?
Yes. GPT for Sheets paid plans include AI credits, so you can run formulas at a flat monthly price with no API key or token math.
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