# Mix by Modulus > Mix is a privacy-first, pay-per-use AI reasoning service. It anonymizes your prompts, routes portions of them across multiple frontier AI models (Claude, Gemini, GPT, Grok, Perplexity), and synthesizes their work into a single answer through ensemble reasoning. No subscription: $20 buys 1,000,000 Mix tokens, and credits never expire. Mix is operated by Modulus AI, Inc. and built on patented Modulus technology. Key privacy properties: - Personally identifying information is substituted before prompts reach external AI models, in both prompts and uploaded files. - Billing and reasoning run on physically separate infrastructure; payment identity never enters the reasoning environment. - Conversations are wiped from Mix servers after each use; no saved chats, no behavioral profile, no tracking cookies. - Payment by standard or anonymized card, or cryptocurrency. ## Pages - [Home](https://mix.chat/): What Mix is and how it protects your identity - [How It Works](https://mix.chat/how-it-works): The reasoning and privacy pipeline, step by step - [Privacy](https://mix.chat/privacy): The privacy architecture and Mix's privacy rules - [Pricing](https://mix.chat/pricing): Pay-per-use pricing, $20 per 1,000,000 Mix tokens - [Buy Tokens](https://mix.chat/buy-tokens): Early-access signup - [About](https://mix.chat/about): Who builds Mix and why - [Patent](https://mix.chat/patent): The patented Modulus technology behind Mix - [Terms](https://mix.chat/terms): Terms of Service - [Privacy Statement](https://mix.chat/privacy-statement): Formal privacy policy - [Contact](https://mix.chat/contact): Contact form