II-Agent (Intelligent Internet)

Full Description

II-Agent is the flagship open-source AI agent framework from Intelligent Internet (II.inc), founded by Emad Mostaque (former Stability AI founder). Launched in 2025, it's designed to autonomously execute complex workflows across research, coding, data analysis, and content creation. Key features include multi-model chat interface with support for Gemini 3, Claude Sonnet 4.5, and GPT-5, bring your own key (BYOK) functionality, full-stack development capabilities from setup to deployment, a research agent (II-Researcher) with arXiv/PubMed integration, browser automation with vision-enabled navigation, and context management handling up to 120,000 tokens. The framework achieves state-of-the-art performance on Terminal Bench 2 and positions itself as a superior open-source alternative to closed agents. II.inc's mission is to democratize AI through open-source, sovereign AI infrastructure.