Quick answer
SpaceX's own IPO filing put Grok at roughly 117 million monthly active users as of March 2026, tied to its integration with X (about 550 million users, with roughly a fifth engaging with Grok); earlier and third-party figures range from about 60 to 65 million, so the 117 million figure, coming from a regulatory filing rather than a press release, is the most load-bearing number currently public.
Grok is xAI's assistant, built directly into X and also available as its own app and at grok.com. Unlike most of its competitors, xAI does not publish regular usage figures, so most of what is known publicly comes from leaks, press reporting and, in one notable case, a securities filing.
The numbers in circulation
~117M
SpaceX's IPO filing reported this as Grok's monthly active users in March 2026
~550M
X's reported total user base in the same filing, with roughly 21% engaging with Grok features
~64M
An internal figure reported for September 2025, before the filing
~245M
An independent estimate of monthly visits to grok.com in May 2026, a different metric (visits, not users)
The 117 million figure is the most citable of these because it comes from a regulatory filing (SpaceX's IPO materials), not a vendor blog or press release. It should still be read as a snapshot of one month, not a steady-state figure, and xAI itself has not confirmed or published it directly.
Why Grok's design matters for measurement
Because Grok draws on real-time X posts in addition to training data and web results, its answers can shift faster than those of assistants that rely mainly on a periodically refreshed web index. That makes a single visibility reading on Grok less stable over time than the same reading on, say, Gemini, and argues for checking it more often rather than less.
Users of Grok versus users of X
What this means for measurement
- Do not treat the 117 million figure as xAI's own confirmed number; it is public because of a different company's filing
- Expect more month-to-month movement in Grok's answers than in platforms with a slower-moving index
- Watch both grok.com and in-app X answers, since the two have been reported to differ
Frequently asked questions
Is 117 million Grok's official user count?
It is the most citable public figure, but it comes from SpaceX's IPO filing rather than a direct xAI disclosure, so treat it as reported rather than confirmed by xAI.
Why does Grok's citation behavior matter for brand teams?
Because Grok weighs real-time X activity more heavily than most assistants, a brand's visibility there can shift within hours of a notable post, not only after a web index refreshes.
Sources
Cite this page
BrandWater AI Research. (2026, 16 October 2026). Grok and X: what the public record shows about a new kind of citation surface. https://brandwaterai.in/research/grok-and-x-a-new-citation-surface
How we work
Figures are dated and linked to their sources. Where none exist we say so. Read our methodology and AI transparency pages.