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Who makes Grok now: SpaceX. xAI was acquired in February 2026, rebranded SpaceXAI in July, and renamed again to SpaceX SI in October. The legal entity is still SpaceXAI LLC, which is why your invoices say SpaceXAI.
New to Grok: start with the complete guide, then the pricing tiers.
Deciding whether to pay: go straight to the SuperGrok tier comparisons.
Building with it: the API key walkthrough and the agents section below.
Grok has changed hands and changed names twice in nine months, and a lot of what is written about it online still refers to a company that no longer exists. This page is the index to everything we have published about it, organised by what you are actually trying to do — plus a straight answer on what the thing is called this week.
What it is called now, and why nobody is sure
The short version: Grok is a SpaceX product.
- 2 February 2026 — SpaceX acquired xAI in an all-stock deal. xAI was valued at $250 billion against SpaceX at $1 trillion, for a combined $1.25 trillion.
- May 2026 — Musk said xAI would cease to exist as a separate company, with Grok and X becoming SpaceX's AI division.
- July 2026 — xAI was rebranded SpaceXAI.
- October 2026 — renamed again to SpaceX SI. The official account became @SpaceXSI on 10 October.
The legal entity remains SpaceXAI LLC, trading as SpaceX SI. That is why subscription emails and card statements still read SpaceXAI while the website and social accounts say SpaceX SI. Both are correct. Neither is a scam, which is worth saying because Musk-adjacent fake branding is common enough that people reasonably check.
The same entity also owns X, Grokipedia, Grok Build, Grok Bot and — since the deal closed on 14 August 2026 — Cursor. Michael Nicolls, previously a Starlink vice president, has been president since 10 April 2026.
Getting started
How to use Grok: complete guide — the full walkthrough if you are starting from nothing.
Which Grok version am I using? — the model line explained, because the version numbers are not obvious from inside the app.
25 practical things you can do with Grok — for when you have access and want ideas beyond chat.
How Grok memory works — what it remembers between conversations, and how to control it.
Pricing and limits
Prices move. These pages carry the current figures; this hub deliberately does not duplicate them.
Grok pricing tiers explained — every tier, what separates them, who each is for.
Grok rate limits: messages, images, API, voice — the limits you will actually hit, by plan.
SuperGrok Plus pricing — what the tier added and what it costs.
Grok Unlimited mode explained — what "unlimited" means in practice, which is never quite unlimited.
SuperGrok Heavy review — the top tier, and whether the jump is justified.
Is it worth paying for?
SuperGrok vs free Grok — the first question most people have.
SuperGrok Plus vs Standard — the two mid tiers, side by side.
SuperGrok Plus vs Heavy — where the big price step sits and what it buys.
SuperGrok vs ChatGPT Plus — the cross-vendor version of the same question.
SuperGrok vs Claude Pro vs ChatGPT Plus — all three premium consumer tiers together.
Which one should you actually buy? — a decision framework rather than a feature table.
Voice mode
How to enable voice mode on iPhone, Android and desktop — the setup walkthrough.
Voice mode FAQ — the questions that come up once it is running.
Voice mode pricing — what it costs and on which tiers.
Voice limits on SuperGrok and free — minutes, caps and what happens when you hit them.
Supported countries — check before you assume it works where you are.
Grok Voice 3: pricing, benchmarks, agent API — the developer-facing version.
Grok Voice 3 vs GPT Live vs Gemini Live — the three-way voice comparison.
Grok voice vs ChatGPT voice — head to head.
Agents and building
How to get a free Grok API key — step by step, the usual first stop for developers.
How to create custom Grok agents — building your own rather than using templates.
Agent settings explained — every option and what it changes.
50 ready-made agents — the library, if you would rather start from something working.
Agent templates by use case — business, marketing, coding and research.
Best Grok agent prompts — prompts that work, rather than prompts that sound good.
Best Grok AI agents and the deep dive version.
Five agents we actually built and ran — what worked and what did not.
Grok Build and the agent client protocol — the developer platform.
Grok Build vs Claude Code — the coding-agent comparison.
Image and video
Grok Imagine: API access, pricing and keys — the generation API.
The image and video upgrade — what changed in the app.
Grok against everything else
Claude vs Grok · ChatGPT vs Claude vs Grok · Grok vs OpenAI
Grok 4 vs Claude Sonnet 5 vs GPT-5.5 — the model-level comparison.
Grok vs Perplexity for research — real-time data against citation quality.
Grok Voice Think Fast 2 vs ElevenLabs — voice quality head to head.
The company
xAI dissolved: Grok and X become SpaceXAI — the announcement that started the naming confusion.
SpaceX acquires Cursor for $60 billion — the coding tool now owned by the same company as Grok.
FAQ
Who owns Grok now?
SpaceX. It acquired xAI on 2 February 2026 in an all-stock deal valuing xAI at $250 billion against SpaceX at $1 trillion. Grok, X, Grokipedia, Grok Build, Grok Bot and Cursor all sit under the same entity.
Why does my Grok invoice say SpaceXAI when the website says SpaceX SI?
Because both are correct. The legal entity is SpaceXAI LLC, which is what appears on billing, and it trades as SpaceX SI, which is what appears publicly. xAI became SpaceXAI in July 2026 and SpaceX SI in October 2026 after Musk's 4 October post. The official account changed to @SpaceXSI on 10 October.
Is "SpaceXAI" a scam?
No. It is the registered legal name of the company that operates Grok. Checking is sensible — Musk-adjacent fake branding is common and lookalike domains are a real problem — but a Grok subscription billed by SpaceXAI LLC is the genuine article.
Did Grok change because of the acquisition?
The ownership change has not reset the product line. Grok versions, SuperGrok tiers and the API have continued through the transition. What changed is who the counterparty on your contract is, and what the company is called.
Where should I start if I am new to Grok?
The complete guide, then the pricing tiers page to work out which plan fits. If you are deciding whether to pay at all, go to SuperGrok vs free Grok first — it answers the question most people actually have.