One chat. Every top AI model.
Stop juggling subscriptions. SI Assist gives you the world's leading AI models in one simple, private chat. Pick the best brain for every task.
Free plan available · No credit card required
Access models from the leading AI labs
Everything you need from AI, in one tab
Write, research, brainstorm, code and create with the right model for the job, without paying for five separate apps.
All the top models
Switch between GPT, Claude, Gemini and Grok in a single click, even mid-conversation.
One simple price
One account replaces several AI subscriptions. Start free and upgrade only when you need more.
Private by design
Your chats live in your own account on our secure, encrypted servers, and are never sold.
Image creation
Turn ideas into images with Google's latest image model, built right into your chat (Pro and Premium).
Chat with your files
Upload documents and images and ask questions about them. Great for summaries, reports and research.
Organized history
Search, bookmark and pick up any past conversation on any device, from your phone to your desktop.
Up and running in a minute
Create your free account
Sign up with your email. No credit card needed.
Pick a model
Choose GPT, Claude, Gemini or Grok from the menu at the top of the chat.
Start chatting
Ask anything. Upgrade any time for premium models and more usage.
Simple plans that grow with you
Start free. Upgrade when you want the most powerful models and higher limits.
Basic
For trying SI Assist and everyday questions.
- Fast everyday models from OpenAI, Google, xAI and Anthropic
- Claude Sonnet (Lite) and Claude Haiku
- Monthly usage allowance
- File uploads and chat history
Pro
For professionals who use AI every day.
- Everything in Basic
- Premium models: GPT-6.1, GPT-5.5, Claude Opus, Gemini Pro, Grok 4.7
- Full-power Claude Sonnet with deep thinking
- AI image creation
- Much higher monthly usage
Premium
For power users, teams and businesses.
- Everything in Pro
- Our highest usage limits
- Early access to new models
- Priority support
Questions, answered
What is SI Assist?
SI Assist is one chat app that gives you access to many of the world's best AI models, including GPT, Claude, Gemini and Grok, under a single account and price.
Is the free plan really free?
Yes. The Basic plan costs nothing and needs no credit card. It includes a monthly usage allowance on our everyday models.
What happens if I use up my monthly allowance?
Your usage resets every month. If you need more before then, you can upgrade to Pro or Premium at any time.
Which model should I use?
Each model has strengths. Claude is great for writing, GPT for all-round tasks, Gemini for fast answers and Grok for up-to-date, conversational replies. Try a few and switch freely.
Is my data private?
Your conversations are stored in your own account and are never sold. Messages are sent to the AI provider you choose only to generate a reply.
Can I cancel anytime?
Yes. Paid plans are month-to-month with no long-term contract.
Ready to meet your new AI assistant?
Join SI Assist today and get every top AI model in one place, free to start.
Create your free account →