Sigma has announced the release of an open-source private AI browser that integrates a web agent and local large language models (LLMs) directly into the browser, enhancing user privacy by eliminating reliance on remote servers. This innovation transforms the browser from a mere display tool into an interactive workspace, allowing the AI to manage tabs, forms, search results, and tasks in real-time. Notable models such as Qwen, Gemma, and Nemotron facilitate functions like summarizing content and automating web workflows without needing cloud-based requests. The design prioritizes privacy, ensuring that all AI operations occur on-device.

Qwen: Qwen is Alibaba’s series of open-weight large language models emphasizing agentic coding, reasoning, and real-world task handling. Recent iterations like Qwen3.6-Plus improve capabilities for agent workflows. In the Sigma browser, Qwen supports local actions such as page summarization, form filling, and product comparison.
Gemma: Gemma is Google’s open-source family of large language models built for advanced reasoning, agentic workflows, and efficient on-device deployment. The Gemma 4 series features optimizations like speculative decoding for faster local inference. Sigma browser utilizes Gemma for executing web-based AI tasks without remote server requests.
Sigma: Sigma is a free, open-source web browser prioritizing privacy through local AI agents, ad-blocking, and on-device processing without cloud dependencies or data transmission. It enables the browser to function as an AI agent workspace by accessing tabs, forms, search results, and sessions in real-time. Sigma recently showcased the Hermes agent running on local models for web tasks like summarization and automation.
Nemotron: Nemotron is NVIDIA’s open model suite designed for agentic AI, incorporating multimodal features for vision, audio, and language processing in agents. Recent releases like Nemotron 3 Nano Omni unify capabilities for complex agent applications. Sigma integrates Nemotron locally to automate repetitive web workflows and search across tabs.

Privacy Design: Sigma Eclipse runs AI agents and LLMs entirely on-device to maintain full user privacy.
Agent Integration: Hermes agent operates within Sigma browser using local models for seamless web interaction.
Open-Source Focus: The browser supports open-weight models for cloudless execution of tasks like form filling and tab searching.