AI & LLM
Token, cost & context tools for LLMs
AI & LLM calculators
3 tools for Token counter, LLM cost, Context window and more — accurate, instant, and free.
Reckonist’s AI & LLM tools turn prompts into numbers — how many tokens your text is for each model, what an API call actually costs (input vs output), and whether your prompt fits the context window. Each runs entirely in your browser on the model’s own tokenizer, so your prompt never leaves your device, against current per-model pricing and context sizes.
Tokens & cost3
LLM Token Counter
Count the tokens in a prompt for each model (OpenAI exact, Claude/Gemini estimated) — plus words, characters, live cost and context-fit, all in your browser.
LLM API Cost Calculator
Estimate LLM API cost from input/output tokens at current per-model rates, compare providers, and find the cheapest model for your prompt.
Context Window Checker
Check each model’s context window and max output, see whether your prompt fits (with output budget reserved), and compare models side by side.