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OpenThena

Plans and prices

OpenThena

Free

OpenThena itself is free · pay only for the model provider you use

Every plan, in full

On the record

API limit
The chat API accepts at most 50 messages per request.openthena.com · read 5 Oct 2026
Chat storage
Chat history is saved in the browser's localStorage and can be erased by clearing a conversation or browser data.openthena.com · read 11 Oct 2026
Cost limit
OpenThena itself is free; users pay only for the model provider they choose.openthena.com · read 11 Oct 2026
Default model
It uses Xiaomi MiMo (mimo-v2.5-pro) by default, and the model can be changed through an environment variable.openthena.com · read 11 Oct 2026
Deployment
The documentation describes one-click Vercel deployment and self-hosting.openthena.com · read 11 Oct 2026
Gateway
Its LiteLLM-style gateway provides an OpenAI-format interface to models.openthena.com · read 11 Oct 2026
History storage
Chat history is stored in browser localStorage and can be erased by clearing a conversation or browser data.openthena.com · read 5 Oct 2026
License
OpenThena is MIT licensed and described as auditable and open source.openthena.com · read 11 Oct 2026
Local setup
The quickstart requires Node.js 18+ and a Xiaomi MiMo API key to run locally.openthena.com · read 5 Oct 2026
Model
Xiaomi MiMo v2.5 is the default model, and the provider can be changed through configuration.openthena.com · read 5 Oct 2026
Model compatibility
The FAQ says any OpenAI-compatible endpoint works, including a self-hosted LiteLLM proxy or a local model.openthena.com · read 11 Oct 2026
Privacy
The maker says it has no database, accounts, message-content server logs, analytics, fingerprinting, or advertising cookies.openthena.com · read 11 Oct 2026
Product
OpenThena is an open-source AI assistant with a streaming chat experience.openthena.com · read 11 Oct 2026
Provider data
Prompts are sent to the configured upstream model provider, whose data handling is governed by that provider’s terms.openthena.com · read 5 Oct 2026
Provider data handling
Prompts are sent to the configured upstream model provider, whose data handling is governed by that provider's terms.openthena.com · read 11 Oct 2026
Self-hosting
OpenThena is a Next.js app that can run anywhere Node runs.openthena.com · read 11 Oct 2026
Streaming
Responses stream token by token.openthena.com · read 11 Oct 2026

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