Free, no-signup token estimator and LLM API cost calculator. Compare inference costs across 20+ current models - Claude (Opus, Sonnet, Haiku), GPT-5.x and GPT-4o, Gemini, Llama and Qwen (via Together AI), and Mistral - with dated, sourced list prices. Plus a context-window fit checker for your actual text.
Use it here: weioai.github.io/llm-cost-calculator
- Token estimator - paste text, get an approximate token count (blended chars/4 + word-ratio heuristic; honest about being an estimate, within roughly 10 percent for typical English prose).
- Inference cost calculator - input tokens, output tokens, requests/day in; cost per request / day / month out, for any model.
- Comparison table - the same workload priced across every model, sorted by monthly cost.
- Context-window fit checker - does your text fit the selected model's published context limit?
Every price is a published list price checked against the provider's official pricing page, with the check date shown on the page (currently 2026-08-27) and source links in the footer of the tool. No invented numbers.
100 percent client-side. A single static HTML file with zero dependencies, no analytics, no cookies, no network calls. Nothing you paste ever leaves your browser, and the page works offline once loaded.
Weio routes tasks to the most cost-efficient model that passes quality - connected to your actual tools. This calculator is one of our free developer utilities.
MIT