AI Chatbot Race: Who's Really Winning?

Ask most people which AI chatbot is winning, and they'll likely say ChatGPT. It's true that OpenAI's flagship product still commands the largest audience. However, looking beyond sheer scale to growth trajectories and user engagement reveals a more complex, dynamic picture in mid-2026. Data from Similarweb's latest Generative AI Landscape report, analyzed here, shows that while ChatGPT maintains its lead in raw reach, other players like Claude AI are demonstrating remarkable momentum.

The competition among leading AI chatbots, ChatGPT, Google's Gemini, Anthropic's Claude, and Perplexity AI, isn't a simple race for market share. Instead, it's a multi-faceted battle across different metrics: web traffic, app growth, paid acquisition, and user behavior. Understanding these nuances is critical for any brand deciding where to invest its AI visibility efforts.

Web Traffic Trends: A Shifting Tide

ChatGPT's website, chatgpt.com, continues to attract the most global web visits. Yet, its growth has been steady rather than explosive over the past year. The real story is in the accelerating curves of its competitors.

Gemini.google.com saw gradual growth through 2024 and early 2025, but experienced a sharp uptick starting around September 2025. This surge coincided with Google's integration of Gemini into its core search experience. By May 2026, Gemini had firmly established itself as the clear second-place platform in terms of monthly visits and unique users, significantly outpacing others besides ChatGPT. For more on Gemini's ascent, see AI’s Battle for Distribution: Why Google’s Gemini is Cutting into ChatGPT’s Lead.

Claude.ai's traffic line presents the most dramatic upward trajectory. After a year of relatively slow growth through 2024 and 2025, its visits nearly doubled in February 2026 and continued that pace for two months. This near-vertical climb suggests a significant product or distribution event, and its sustainability is a key question. This rapid expansion is a core reason why Claude AI is seeing such impressive growth in 2026.

Perplexity.ai, conversely, shows a declining trend. Its user numbers peaked around October 2025 and have been on a downward path since. This marks Perplexity as the only one of the four platforms analyzed where the most recent trend is negative, positioning it differently from the fast-growing pack.

App Engagement: Beyond Reach, It’s Habit

While web visits measure reach, app stickiness, the proportion of monthly users who return daily, reveals user habit. Here, ChatGPT leads decisively. It boasts the largest monthly user base and the highest stickiness rate, a powerful combination that's difficult for competitors to erode. ChatGPT isn't just winning on scale; it's winning on engagement.

An interesting dynamic plays out between Claude and Gemini in app engagement. Gemini's app has a substantially larger monthly user base than Claude's, both in the US and globally. However, Claude exhibits slightly higher stickiness. This means a smaller fraction of Gemini's vast audience returns daily compared to Claude's. While Claude's absolute daily active user count remains smaller, its audience behaves more like committed daily users.

Perplexity sits at the bottom of the stickiness rankings, aligning with a more specific, less habitual use pattern focused on research or quick lookups.

Fastest Growing: The Rate of Change Matters

This is where the narrative of ChatGPT's dominance truly falters. Measured by year-over-year growth in worldwide app monthly active users, the ranking almost inverts. Claude's app audience experienced the highest percentage growth over the past year by a significant margin. Perplexity and Gemini also showed substantial growth, outpacing Gemini, which in turn grew faster than ChatGPT.

ChatGPT, despite adding the most absolute users due to its massive base, posted the slowest percentage growth. This is typical for platforms deep into mainstream adoption; the easy, high-percentage gains are behind them. Claude and Perplexity, earlier on their adoption curves, show larger percentage gains from smaller bases. For brands, this means while raw scale still favors ChatGPT and increasingly Gemini, the rate of change, a leading indicator of future market direction, currently points strongly towards Claude.

Indeed, StartupHub.ai data shows Claude AI with a StartupHub score of 69/100, putting it on par with Mistral AI and ahead of Gemini (63/100). OpenAI, the company behind ChatGPT, scores highest at 84/100, indicating its established market dominance, but Claude's rapid growth suggests it's a formidable contender.

Paid Acquisition: Fueling the Growth Engine

Total spending on AI paid search still favors incumbents. ChatGPT leads in ad spend, followed by Gemini, with Claude's spend being a fraction of the former. However, month-over-month spending trajectories tell a different story.

When indexed to June 2025 levels, Claude's paid search investment is scaling up much faster than either ChatGPT's or Gemini's. This suggests Anthropic is prioritizing consumer growth, actively investing to capture more users, rather than relying solely on organic momentum. Gemini shows a seasonal spike around the December-January window, while ChatGPT's spend climbs more gradually.

Usage Skew: What Are Users Actually Doing?

Classifying all chatbot users as a single group misses key distinctions. Category share analysis reveals differences in how people use these tools.

Programming and developer-software-related queries form a larger share of Claude's and Gemini's activity than ChatGPT's. This challenges the notion that Claude is solely the 'coding chatbot'; Gemini's usage skews just as technical. ChatGPT's category mix, surprisingly, looks closest to a general-purpose search replacement, despite its common association with developers.

Interestingly, adult-content category share is consistently the smallest slice of Claude's usage mix, falling below ChatGPT, Gemini, and even the general Google search baseline. Gaming content follows a similar pattern. This indicates Claude's usage is most weighted toward work and technical tasks, while ChatGPT serves as a more general household search substitute, with Gemini falling in between.

The three-metric read, Reach, Retention, and Rate, provides a clearer picture. ChatGPT leads on reach and retention. Claude leads by a wide margin on growth rate. Gemini is a strong second in reach and accelerating. Perplexity lags behind in most growth and engagement metrics. No single platform dominates all three, making the AI chatbot arena a dynamic and competitive space.