Grok might not be the most popular LLM around, but it does seem to have some dedicated users.
New data from SimilarWeb tracking average visit duration across leading generative AI platforms for February 2026 shows Grok.com at the top with an average session length of 12 minutes and 31 seconds — more than double that of any other platform in the cohort. Google’s Gemini came in second at 7:17, followed by Claude.ai at 5:57, ChatGPT at 5:53, DeepSeek at 5:05, and Perplexity at 4:43.
The gap between Grok and the rest of the field is striking. While the five other platforms are clustered within a roughly two-minute range of each other, Grok sits nearly five minutes ahead of its nearest rival. Average visit duration is a measure of user engagement — it reflects how long users stick around per session, not how many arrive. In that sense, it’s a different signal from raw traffic share, where Grok trails considerably, sitting at around 3.4% compared to ChatGPT’s 64% and Gemini’s 21%+.
What could explain Grok’s outsized session lengths? A few factors are plausible. Grok is deeply integrated into X (formerly Twitter), where users may come for an AI query and end up in longer, context-heavy conversations around content on the platform. xAI has also been differentiating Grok with features like AI companions — interactive characters designed for sustained engagement — which could naturally extend session times. And Grok’s user base, while smaller, skews toward power users: early adopters who tend to lean on AI more heavily than casual visitors.
For Gemini, second place in visit duration is notable given that its traffic has grown 643% year-over-year as of February 2026 — a surge driven in part by integration across Google’s product ecosystem and viral image generation features. That kind of explosive growth often brings a flood of first-time or casual users, which typically dilutes average session lengths. The fact that Gemini still managed second place in engagement despite this influx suggests its users are finding genuine utility in the platform, not just checking it out once.
ChatGPT, despite commanding the most visits by a wide margin — nearly 4x Gemini’s MAUs as of February 2026 — sits fourth in session duration at 5:53, just behind Claude at 5:57. Perplexity, which has carved out a niche as an AI-powered research tool rather than a general-purpose chatbot, records the shortest average visit at 4:43 — which makes sense given that its use case often involves quick, cited answers rather than extended dialogue.
The data points to an increasingly nuanced competitive picture. Traffic volume and engagement depth don’t necessarily move together, and the AI platform race may increasingly be won — or lost — on retention and depth of use, not just acquisition. For xAI, the visit duration lead is a rare bright spot in a market where it still lags far behind in raw scale. Whether it can translate that engagement into broader adoption remains the central question for Grok’s trajectory.