Who publishes this site
PromptMeter is an independent site published by Rashed. It is not affiliated with, endorsed by, or speaking for OpenAI, Anthropic, Google, or any other model provider. Product names are used so you can tell which tokenizer and which public price the page is talking about.
What the numbers are
The token number is an estimate. On English instructions it is tuned to stay close to cl100k_base, and the home page describes the checks. It is not the integer a provider will bill. Output tokens, cached input, tool definitions, images, and a different tokenizer all move the real total. The density score is not a prediction of answer quality. A high score means the draft contains the signals the checklist looks for.
Prices shown in the tool are public list prices with a check date. They are illustrative input rates. They are not a quote, not tax advice, and not a forecast of your invoice. Model names change. A note that mentions Claude Sonnet or GPT-4.1 describes the families current at the time of writing. Read the provider's pricing page before you commit a budget.
Not professional advice
Nothing on this site is legal, medical, financial, or security advice. A prompt that asks a model for those topics does not become advice because the prompt was well structured. You are responsible for reviewing model output before you act on it, and for deciding whether a given text should be sent to a provider at all.
Provider rules
Articles describe techniques for clearer instructions. They do not describe how to bypass a provider's rules, and the tool will not do that either. If a draft asks a model to ignore its policies, rewriting the headings will not make that draft acceptable. Delete it.