Multi-model. Zero Latency. Maximum Agency.
Escape the single‑model trap. Think in parallel. Catch hallucinations. For developers and founders who need more intelligence and speed.
Escape the single‑chat, single‑model trap. Stop shipping hallucinations, catch them. Big-AGI is crafted to give you the fastest multi-model AI workspace so you can build better and decide with confidence.
Sign in. BYO API keys. Zero lock-in.
BYO API keys. Installable as a web app.
Jan 12
Improved Persona editing (image, emoji, voice) and CJK inputOpen: fix for Anthropic breaking API changes and OpenAI keepalives
Jan 10
OpenRouter image generation with Gemini Nano Banana Pro and moreMobile UX fixes for popups drag/interaction
Access the latest models including Claude Opus 4.5, Gemini 3 Pro, Nano Banana Pro, and GPT-5.2 also with Big-AGI Open on GitHub.
Powerful UX
Designed for flow-state, productivity. Fast, reliable, and focusedLet it flow
Private
Chats are stored in your own browser. You have the freedom to self-hostYour data is your gold
Advanced Fun
Call AGI · mobile UI · voice UI · drop files · snap pics · shrink PDFs · plot diagrams · make coffee
With Personas
Engage with diverse AI experts. Clone new ones from YouTube Videos. Because one size fits all nobody
And /more
Type /react for multi-step reasoning, /imagine to draw images, /browse to read web pages, and more
Overpowered
It‘s clear this has been a labor of love, and stands head and shoulders above other projects out there.
- Superhero Developer
Get started in 60* seconds
Bring your API keys. We handle the rest.
*take your time: more APIs = more better!
Works instantly in your browser - can be installed too
Add your API Keys for direct unfiltered zero-lag access
Run multiple models, catch hallucinations, act stronger
Open Source, Free and Pro.
Independent, non-VC funded. Pro subscriptions power all development, including the free and open-source tiers.
Pro
Never lose your work
Everything in Free, plus:
Cloud backup of personas & chats
Email support from the builder
Need a Business plan?
Custom deployments, team management, priority support, and SLA guarantees.
All plans include BYO API keys. Your data stays yours.
Ready to be in Control?
Join ER doctors, lawyers, developers, founders, and top experts who use Big-AGI daily to create and decide with confidence.