Grok, the artificial intelligence chatbot built by Elon Musk's xAI, is closing in on 100 million monthly active users, according to a post on X. First launched by xAI in 2023, the assistant now reaches its audience through the social platform X, a dedicated mobile app, the grok.com website, and Tesla vehicles, and its exact user count depends on how a user is defined across those surfaces.

Growth Trajectory

SpaceX's June 2026 S-1 filing disclosed that roughly 117 million monthly active users engaged with Grok's AI features as of March 31, 2026. The same filing put that figure at about 89 million at the end of 2025.

Further back, Grok counted around 64 million monthly users in September 2025. In other words, the user base has nearly doubled under the broader feature-level definition in a relatively short window.

Later estimates placed total monthly active users at 118.4 million in October 2026, an increase of 0.7% from September.

The access-point breakdown for October 2026 shows how widely Grok's audience is distributed:

• X platform: 54.6 million
• Mobile app: 34.6 million
• grok.com: 25.4 million
• Tesla vehicles: 3.8 million

Similarweb estimates that the Grok app on Android and iOS had 93.4 million monthly active users and 12.7 million downloads in October 2026, with both figures up more than 3% from September. The spread between that app-level figure and the 118.4 million feature-level total shows how much methodology shapes headline user counts.

Engagement and Monetization

Average session length for Grok users stands at 7 minutes and 34 seconds. The audience skews heavily male, with men accounting for 74.1% of users.

On the revenue side, Grok has approximately 2.4 million paid SuperGrok subscribers, the paid subscription tier for the chatbot. Measured against the estimated user base, paying users still represent roughly 2%, a ratio that puts the size of the conversion opportunity in perspective as the audience scales.

A Crowded Field

Grok holds a 3.4% share of the US AI chatbot market, where it trails ChatGPT, Gemini, and Claude, the chatbots from OpenAI, Google, and Anthropic, respectively. For a challenger at single-digit share, the access-point breakdown offers the clearest picture of where its audience actually sits: each surface contributes a distinct, countable slice of the total. The Tesla integration adds another distribution channel, and at 3.8 million monthly users it is the smallest of the four surfaces.

What the Figures Indicate

The 0.7% monthly gain recorded in October 2026 is a far cry from the jump recorded between late 2025 and March 2026. With roughly 2.4 million paying subscribers, conversion remains the metric to watch, alongside app download momentum, which rose more than 3% month over month.

X still accounts for the largest single block of users, at 54.6 million. The SpaceX S-1 disclosure also matters for anyone tracking Musk's corporate empire: because Grok usage figures now appear in a securities filing, the numbers carry regulatory weight.

Disclosure: The original CryptoBriefing article was edited by Diego Almada Lopez.