● Covered by 1 source · 1 reportMedium impact1 neutral
Thiel Fellow Sigil Wen launches Underdog, an on-device AI assistant for privacy
Key points
- Sigil Wen launched Underdog, an on-device AI assistant.
- Underdog runs locally on Macs and Windows PCs, with mobile versions planned.
- It uses a 27-billion parameter model and Wen's Husky inference engine.
- The app prioritizes privacy by keeping user data on the device.
Underdog AI Assistant Launched
Sigil Wen, a Thiel Fellow, has launched Underdog, an invite-only beta for a new AI assistant. This assistant is designed to operate entirely on the user's device, initially supporting Macs and Windows PCs, with future plans for Linux, iPhone, and Android versions. The core feature of Underdog is its emphasis on user privacy, as all data processing occurs locally.
Technology and Privacy Features
Underdog is powered by Husky, an inference engine developed by Wen, which is optimized for running AI models quickly on local hardware. Wen states that Husky minimizes data transfer between a computer's main chip and graphics chip compared to other on-device engines. Additionally, Underdog includes security features such as encrypting access keys for authorized email and other accounts.
Model Capabilities and Performance
Underdog utilizes a 27-billion parameter reasoning model, fine-tuned from Qwen3.8-27B. While smaller than current state-of-the-art cloud-hosted models, Wen claims its performance is comparable to models like Claude Opus 4.6 from six months prior in certain benchmarks. This level of capability is intended to handle common AI assistant tasks, such as shopping research or answering homework questions, without requiring users to sacrifice privacy.
Business Model and Future Outlook
The initial business model for Underdog involves offering the app for free, with no plans for ad support. Wen anticipates that the capabilities of small on-device models will continue to improve over time, further enhancing the value proposition of privacy-focused AI assistants like Underdog.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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Reporting from
Sigil Wen, a Thiel Fellow, launched Underdog, an invite-only beta of an AI assistant that runs entirely on-device for enhanced privacy. Underdog uses Wen's Husky inference engine to run a 27-billion parameter model, aiming to provide capabilities comparable to older state-of-the-art models without compromising user data. This development matters as it offers a privacy-focused alternative in the AI assistant market by keeping user data local.