SpaceX’s Grok Bot, the agentic assistant it launched in August, “already had paid weekly users of 800,000 earlier this month, more than doubling over the last month,” President and Chief Operating Officer Gwynne Shotwell said on the company’s third-quarter earnings call on 20 October 2026, according to The Motley Fool’s transcript of the call.
The same day, TechCrunch reported Sensor Tower data showing that Meta’s Muse, the AI agent Meta launched in September, has had 10.9 million downloads, 10.2 million of them in the United States. The two numbers measure different things: one counts people paying in a given week, the other counts installs.
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The key insight: As we read it, SpaceX reported how many people pay for Grok Bot each week, while Muse is measured on downloads and retention estimates from Sensor Tower, so the two figures describe different stages of the same funnel.
Business users. “B2B is our fastest-growing category with companies increasingly using Grok bot as a force multiplier across sales, marketing, IT and engineering,” Shotwell said, according to the transcript.
Large accounts. “Grok Enterprise customers with more than $1 million in run rate revenue, including Cursor, were up 50% quarter-over-quarter on a pro forma basis,” Shotwell said.
Growth. Chief executive Elon Musk said: “So on the Grok bot side, we’re seeing the fastest growth of a product that I’ve ever seen in my life for Grok bot.” He added: “We’re also seeing that the usage of Grok bot grows over time per user, it does not decline.”
Enterprise rollout. Musk said SpaceX is “in early deployment with some trusted customers,” and that “we expect to be in wide deployment within a few weeks for enterprise customers for Grok bot.”
Compute. “I think Grok bot may end up being what uses most of our Super Intelligence compute,” Musk said.
US retention for Meta’s Muse after 7 and 14 days against the average of rivals ChatGPT, Claude and Grok, per Sensor Tower data reported by TechCrunch on 20 October 2026, with the 800,000 paid weekly users SpaceX gave for Grok Bot on its 20 October earnings call.
Grokbot now with 800K paying weekly users and engagement is only getting stickier and deeper.
Meanwhile recent data from Morgan Stanley said retention on Muse is just 23% after 14 days, lagging other platforms.
While $META threw users off the agentic deep end, $SPCX targeted a tech savvy audience on X that is highly interested in paying for productivity and AI optimization. This is why engagement of the product is getting deeper as it evolves and new use cases are ideated.
Musk called it “the fastest growth of a product that I’ve ever seen in my life for Grok Bot. I’ve never seen anything grow this fast. We’re also seeing that the usage of Grok Bot grows over time per user. It does not decline. As we make Grok Bot more useful, we’re seeing users use it more per week, not use it less.
Michael Sikand’s post (21 October 2026, 03:27 UTC), which prompted this piece. He writes that Grok Bot has 800K paying weekly users, attributes a 23% 14-day retention figure for Muse to Morgan Stanley and calls it lagging, quotes Musk from the call, and says Jevons paradox is playing out. The opinions are his; the piece checks the figures against the call transcript and the Sensor Tower data reported by TechCrunch.
What Sensor Tower Shows for Muse
In the United States, Muse had a 30% retention rate after 7 days and a 23% retention rate after 14 days, against a rival average of 19% and 16%, TechCrunch reported, citing Sensor Tower. The rivals TechCrunch named were ChatGPT, Claude and Grok.
Per Sensor Tower’s data, Meta allocated 39% of its total advertising spend to marketing Muse in October, up from 23% the month before, TechCrunch reported.
Two Different Measures
As we read it, the two products are being measured on different things. SpaceX reported a count of paying weekly users and said usage per user rises; Muse is measured by third-party download and retention estimates, with a large share of Meta’s advertising behind it, according to Sensor Tower’s data.
In the material we read, SpaceX gave no download figure for Grok Bot and TechCrunch’s report gave no paid-user figure for Muse, so the two numbers cannot be set against each other directly.
What the Post Claimed
Michael Sikand wrote on X on 21 October that “recent data from Morgan Stanley said retention on Muse is just 23% after 14 days, lagging other platforms.” We could not read a Morgan Stanley note. The 23% 14-day figure we could verify comes from Sensor Tower via TechCrunch, which put Muse above the 16% rival average, not below it.
Sikand also wrote that “Jevon’s paradox is playing out here.” That is his own reading of the call.
Connecting the Coverage
This piece builds on our SpaceX call piece, which reported the Nvidia Blackwell ramp and Musk’s claims on the call, and on our Q1 forecast piece, which covered SpaceX’s forecast of $33 billion to $37 billion of first-quarter 2027 revenue and Musk’s prediction of $500 billion to $1 trillion of annual recurring revenue by the end of 2027.
As we read it, a paid weekly user is a narrower and later-stage measure than a download: it counts people who have installed, returned and paid in the same week.
As we read it, Sensor Tower’s retention data cuts against Sikand’s framing: Muse kept 23% of US users after 14 days against a 16% rival average, as TechCrunch reported.
As we read it, Shotwell’s remark that B2B is Grok Bot’s fastest-growing category points to business customers as part of the paid count; SpaceX gave no split in the passages we read.
Gwynne Shotwell, SpaceX Q3 2026 earnings call
“Grok bot, our Agentic Assistant, launched in August, and we already had paid weekly users of 800,000 earlier this month, more than doubling over the last month.”
Three Implications
PAID DEPTH SpaceX said Grok Bot had 800,000 paid weekly users earlier this month, more than doubling over the previous month, according to the call transcript.
REACH Sensor Tower data reported by TechCrunch shows 10.2 million US downloads of Muse in its first 40 days.
RETENTION Sensor Tower put Muse’s US 14-day retention at 23%, against a 16% average for ChatGPT, Claude and Grok, TechCrunch reported.
The framework puts it this way: “The labs are running a fat-tail trade where the casual masses cross-subsidize the power users, and the power users deliver the strategic asset.”
As we read it, a paid weekly user count and a download count sit at opposite ends of that distribution: one tracks the people who pay and return, the other the mass of people who try. The framework was published in June 2026 and does not discuss Grok Bot or Muse.
What Is Not Established
The 800,000 figure is SpaceX’s own and has not been independently verified in anything we read; the call passages we read gave no split between consumer and business users and no price. Sensor Tower’s figures are third-party estimates. We did not read a Morgan Stanley note on Muse. Downloads and paid weekly users are different measures.
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SpaceX said Grok Bot had 800,000 paid weekly users earlier this month, more than doubling in a month, according to the transcript of its 20 October call, while Sensor Tower data reported by TechCrunch shows Muse at 10.2 million US downloads with retention above its rivals’ average. As we read it, one company is reporting paying depth and the other is measured on reach.
A note on sourcing. This piece is built on The Motley Fool’s transcript of SpaceX’s 20 October 2026 earnings call, TechCrunch’s report of Sensor Tower data, an X post by Michael Sikand, and our own earlier coverage, which cites its sources. Nothing here is legal, financial or investment advice.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
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