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SI vs AI: What Does Super Intelligence (SI) Mean?
By the handle.tools team · Published
In this guide 9
SI vs AI is suddenly a real question. Since the end of September 2026, the US government has used "Super Intelligence" (SI) where it used to say "Artificial Intelligence" (AI), companies like Elon Musk's SpaceXAI have announced SI rebrands, and the letters "SI" are turning up in headlines, product names and domain names. But does SI mean something different from AI, or is it the same technology with a new label?
The short answer: in the new US government usage, SI means exactly what AI meant, just renamed. In research and tech circles, "superintelligence" has meant something far bigger for years: AI that goes well beyond human ability. This guide explains both meanings, where the switch came from, how SI compares with AI and AGI, and what it means if you're naming a product, company or handle right now.
What does SI mean?
SI stands for Super Intelligence (often written superintelligence). Right now it's used in two quite different ways, which is the source of most of the confusion.
Meaning 1: the new official name for AI
Executive Order 14434, signed on 29 September 2026, directs US federal agencies to say "Super Intelligence" and "SI" instead of "Artificial Intelligence" and "AI" in official communications, websites, reports and policy documents, as far as the law allows. Crucially, the order keeps the existing legal definition: for now, SI covers the same technologies the law already called artificial intelligence. In this sense, SI and AI mean the same thing.
Meaning 2: AI smarter than humans
Long before the order, "superintelligence" was a research term for a hypothetical intelligence that greatly exceeds human thinking in almost every area: science, strategy, creativity, social skills. Philosopher Nick Bostrom's 2014 book Superintelligence popularised the idea, and AI labs have used the word for their long-term goals. In this sense, SI (often written ASI, artificial superintelligence) is something that doesn't exist yet.
SI vs AI: the differences at a glance
This table compares the terms as they're used at the time of writing.
| AI (artificial intelligence) | SI (official US usage) | Superintelligence (research usage) | |
|---|---|---|---|
| What it describes | Systems that perform tasks needing human-like intelligence | The same systems, renamed | Hypothetical AI far beyond human ability |
| Exists today? | Yes | Yes (it's the same tech) | No |
| Examples | Chatbots, image generators, recommendation engines | The same | None yet |
| Who uses the term | Everyone | US federal agencies; some companies | Researchers, AI labs, philosophers |
| Legal definition | Defined in US law | Uses the AI definition for now | None |
Is SI just a rebrand?
Officially, for now, yes. The order changes the words agencies use, not the law. Commentators at several law firms have pointed out that it doesn't rewrite statutes or existing contracts, and it binds federal agencies rather than private companies. Some academics have criticised the switch as confusing precisely because "superintelligence" already had a different, established meaning.
SI vs AGI vs AI: how they fit together
Researchers usually describe three levels, though there's no universally agreed test for any of them.
| Term | Short definition | Status |
|---|---|---|
| Narrow AI | Good at one task or a defined set of tasks | Everywhere today |
| AGI (artificial general intelligence) | Roughly human-level ability across most tasks, able to transfer what it learns | Debated; no agreed test |
| ASI / superintelligence | Greatly exceeds the best humans in almost every domain | Hypothetical |
Breadth vs level
A useful way to keep them apart: AGI is about breadth (can it do almost anything a person can?), while superintelligence is about level (is it far better than any person?). Some people treat ASI as the step after AGI; others use the terms loosely or interchangeably, which adds to the confusion.
Where the new official SI fits
It doesn't sit on this ladder at all. Official SI is a vocabulary change applied to today's narrow AI. That's why a sentence like "the agency uses SI to process forms" makes sense under the order but would sound absurd to a researcher.
Why did the US switch from AI to SI?
The order frames the change as marking a new era and replacing a term with negative associations ("artificial") with one that sounds more ambitious. Whatever you think of the reasoning, the practical effects arrived quickly.
What changed straight away
- Government websites and documents began switching terms; the NIH, for example, said it would use both terms during the transition.
- Companies followed. Elon Musk said SpaceXAI, formed after SpaceX acquired xAI, would become SpaceXSI. Its X account changed name in October 2026, according to reports.
- Domains moved. Slovenia's .si extension, which reads as "SI", saw new registrations jump more than tenfold in a month. Our guide to .si super intelligence domains covers the rush.
- Speculators moved too. Names matching big brands were registered and listed for sale within days; see will SpaceX buy spacex.si? for what the registry shows.
What didn't change
- The technology. Today's chatbots and models are the same whatever they're called.
- The law, for now. The legal definition of AI still applies until a new one is passed.
- Everyday language outside government. Most people, companies and media still say AI.
Will SI replace AI?
Nobody knows yet. Terms stick when people find them useful, not because they're announced. A few things to watch:
- A legal definition. The order asked for proposed legislative language for "Super Intelligence" within 60 days. If Congress adopts it, SI becomes part of the law, not just style.
- Big tech adoption. If major AI labs and platforms rebrand products as SI, the public will follow. So far most haven't.
- Search behaviour. People still search "AI" far more than "SI". If that starts to shift, marketers will follow quickly.
- International use. The order only covers the US government. Other governments and the EU still say AI.
What SI means for naming a product or company
If you're naming something in AI right now, the SI switch creates both a risk and an opportunity.
The opportunity
- Short names are available. "AI" names have been picked over for years; "SI" names are fresh.
- Cheap domains. A .si domain usually costs far less than a .ai. Check yours on the .si domain checker.
- A timely story. Launching as an SI company signals you're current, at least while the term is new.
The risk
- Confusion. "SI" also stands for the metric system (the International System of Units), Sports Illustrated and many other things. Test your name with real people.
- Trend risk. If SI fades, an SI-heavy name could date quickly. Names that don't depend on either term age best.
- Overclaiming. Calling ordinary software "super intelligence" invites scepticism from technical buyers who know the research meaning.
For ideas that work in both worlds, see our list of super intelligence company name ideas, or generate your own with the AI startup name generator.
How to secure the SI version of your name
Whether or not you use SI in public, it's worth locking down the obvious variants now, before someone else does.
- Check the .si and .ai together on the .si domain checker, which also shows the .com and .io.
- Check variants in bulk. Put yourbrand, yourbrandsi and yourbrandai into the bulk domain checker with .si, .ai and .com selected.
- Check the handles. Run the name through the brand name checker or the X username checker so the social accounts match.
- Register the ones you'd hate to lose, even if you don't use them yet, and point them at your main site.
- Watch the ones you can't get. If a variant is taken, the domain expiration checker shows when it's due to expire.
Conclusion
Recap
SI vs AI comes down to which SI you mean. In official US government language since 29 September 2026, SI (Super Intelligence) is simply the new name for AI, with the same legal definition for now. In research, superintelligence means hypothetical AI that far exceeds human ability, a step beyond AGI, and it doesn't exist yet.
Whether SI replaces AI in everyday language is still open: it depends on a legal definition, adoption by big tech and whether people actually start searching for it.
Final thoughts
If you're building in AI, protect both versions of your name now. Check it on the .si domain checker and the .ai domain checker, then read our .si domain guide before you decide which to lead with.
Frequently asked questions
What is the difference between SI and AI?
In US government usage since September 2026, there isn't one: SI (Super Intelligence) is the new official name for AI, with the same legal definition for now. In research, superintelligence means AI far beyond human ability, which doesn't exist yet.
What does SI stand for in AI?
SI stands for Super Intelligence. It's used as the new official US term for AI, and in research it describes AI that greatly exceeds human intelligence.
Why did the US change AI to SI?
Executive Order 14434, signed on 29 September 2026, directs federal agencies to use "Super Intelligence" instead of "Artificial Intelligence", presenting it as the start of a new era. It changes wording, not the law.
Is SI the same as AGI?
No. AGI means roughly human-level ability across most tasks. Superintelligence in the research sense means far beyond human level. The official US SI is neither: it's a new name for today's AI.
Do companies have to say SI instead of AI?
No. The order applies to federal agencies, not private companies. Some companies, such as SpaceXAI, have chosen to adopt SI anyway.
Does superintelligence exist?
Not in the research sense. No current system greatly exceeds the best humans across almost every domain. Today's tools are called SI only under the new official naming.
What is a .si domain?
.si is Slovenia's country-code domain. Because it reads as "SI", it's become known as the super intelligence domain. Check names on the .si domain checker.
Should I rename my AI company to SI?
Not necessarily. The term is new and may not stick. Registering the SI version of your name and domains is cheap insurance; a full rebrand can wait until it's clearer.
