OpenThena

At a glance

• Editor score
  3.0 / 10
• Pricing
  Free plan
• Best for
  Developers wanting a minimal self-hosted chat UI
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  21 Sep 2026

• Where it wins

  • Streams chat responses and lets users select a model in the UI
  • Keeps conversation history in the browser, not on OpenThena servers
  • Supports Vercel deployment, self-hosting, and OpenAI-compatible endpoints

• Where it doesn't

  • No listed search, file uploads, or image generation
  • Model-provider API usage may incur separate charges
  • Documentation is the only listed support channel

Our verdict on OpenThena

OpenThena is an open-source AI assistant built around a browser-based streaming chat interface, aimed at developers who want a minimal chat UI they can host themselves. It uses Xiaomi MiMo by default and supports other OpenAI-compatible model endpoints through a LiteLLM-style gateway. The web experience includes model selection, while the project also provides an API endpoint. Its focus is a simple route to chatting with configured models rather than a broad set of chatbot features.

OpenThena itself is free and MIT-licensed, and the project provides Vercel deployment guidance as well as self-hosting instructions. The important cost distinction is that free software does not mean free model usage: users pay any model provider whose API they configure. That makes it a plausible fit for developers who already have a preferred compatible endpoint or want control over deployment, but the overall cost depends on the provider they choose. The published product information does not describe paid OpenThena tiers.

Privacy and scope are the clearest trade-offs. Conversations are stored only in the browser and are not persisted on OpenThena servers; the API is described as stateless and does not log message content. This local-history approach suits people seeking a lightweight interface, though browser-local storage is not the same as a shared conversation workspace. Search, uploads, image generation, integrations, and mobile apps are not among its listed capabilities. Choose OpenThena for a developer-oriented, self-hostable chat front end; look elsewhere if you need a richer end-user chatbot or built-in content tools.

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OpenThena pricing

OpenThena fact sheet

Alternatives to OpenThena

• ChatGPTA broad AI assistant combining chat, research, files, images, voice, and connected work tools.9.4
• GeminiA capable AI chatbot for research, files, creative work, and Google-connected productivity.9.3
• Microsoft CopilotA versatile AI assistant with strong Microsoft 365 integration and a free entry point.9.2

See all OpenThena alternatives →

Featured on iTechGuides

OpenThena is listed in our AI Chatbots directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update