Monica AI is an all-in-one AI assistant that consolidates access to the leading frontier models — including GPT-5, Claude 4.5 Sonnet, Gemini 3 Pro, Sora 2, and Nano Banana — inside a single browser sidebar, desktop app, and mobile app. Originally launched as a Chrome extension focused on ChatGPT-powered webpage assistance, Monica has evolved into a comprehensive productivity suite that lets users switch between dozens of AI models without juggling separate subscriptions. The sidebar overlays on any webpage, providing instant summarization of long articles and YouTube videos, AI-powered writing assistance with grammar and tone rewriting, real-time translation with bilingual display, contextual chat that understands the current page, and code debugging directly inline. Monica also includes a robust image and video generation studio with access to models like Nano Banana, Flux, and Sora 2, plus a no-code AI bot builder for creating custom assistants tied to specific knowledge bases or tasks. Since January 2026, Monica uses an Advanced Credits system that lets users flexibly allocate spend across different model tiers, balancing affordability with access to premium reasoning models. It is one of the most popular browser-based AI assistants worldwide with tens of millions of installs across Chrome and Edge.