ChatGPT, Gemini, Claude, Perplexity: 2026 Usage Numbers Rewrite the AI Platform Race

Reach, Retention, and Rate: The Metrics That Redraw AI Platform Rankings

On August 2, 2026, Similarweb released a comparative usage benchmark of the four leading AI chatbot platforms—ChatGPT, Gemini, Claude, and Perplexity—built from web traffic, mobile application engagement, and paid search acquisition through May 2026.

The headline numbers demolish the simple story of an uncontested ChatGPT lead, revealing a market where reach, retention, and growth rate produce three sharply different leaderboards.

Web Traffic Momentum, App Stickiness, and Paid Spend Patterns Exposed

The most visible battleground—web visits—still tilts heavily toward ChatGPT, which continues to draw more traffic than Gemini, Claude, and Perplexity combined.

According to Similarweb, what is changing is the shape of the other three trend lines.

Gemini’s trajectory bent sharply upward beginning in September 2025, when Google pushed its AI assistant and AI Mode deeper into the core search experience.

That integration launched a sustained climb that materially narrowed the gap.

Claude’s curve is the most dramatic, haunting a flat, slow-growing band through 2024 and 2025 before bursting upward in February 2026.

Monthly visits roughly doubled in each of the two following months—the kind of vertical break that usually signals a specific product or distribution trigger, not gradual compounding.

Perplexity.ai tells the inverse story, with visits peaking around October 2025 and then sliding lower through May 2026.

It is the only platform of the four whose current trajectory points down, a markedly different competitive place than “smallest of four fast-growing platforms.”

Where Habit Forms Differently

Web reach measures breadth; app stickiness—the percentage of monthly users who return on a given day—measures habitual depth.

On that axis, the ranking carries a subtle twist.

ChatGPT’s mobile application claims the largest monthly active user base and the highest stickiness rate among the four, worldwide and in the U.S.

That combination—leading on reach and on retention simultaneously—creates a moat that is especially hard for a competitor to erode.

The more intriguing result sits between Claude and Gemini.

Gemini’s app user base is many multiples larger than Claude’s, yet Claude’s stickiness edges ahead of Gemini’s in both geographies.

A smaller portion of Gemini’s sprawling audience comes back daily than the portion of Claude’s tighter user community does.

That does not mean Claude wins on overall engagement in absolute terms, but it does signal an audience that behaves more like committed daily power users and less like occasional or default-app traffic.

Perplexity brings up the rear on stickiness, consistent with a research-oriented cadence that lacks the daily-habit loop of the other three.

The Inverted Leaderboard

Rank the platforms by year-over-year growth in worldwide mobile monthly active users, and the picture inverts almost entirely.

Claude’s app audience expanded at a rate that far outpaces the rest, Perplexity grew substantially faster than Gemini, and Gemini grew well ahead of ChatGPT.

ChatGPT—while adding the greatest raw user volume because of its enormous base—posted the slowest percentage gain of the four.

There is no contradiction here: ChatGPT sits far enough into mainstream adoption that the easy multiples are behind it, while Claude and Perplexity ride earlier points on their curves where a given absolute gain translates into a much larger percentage rate.

For anyone tracking where the market is heading, the rate of change currently favors Claude by a wide margin, even as raw scale still belongs to ChatGPT and, increasingly, to Gemini.

Spending to Accelerate or Consolidate

Total dollars still favor the incumbents.

Over the twelve-month window tracked, AI paid search spend was largest for ChatGPT, with Gemini’s total meaningfully behind and Claude’s total trailing at a fraction of ChatGPT’s investment.

Month-by-month trajectories, however, tell a different tale.

Indexing each platform’s spend to its own June 2025 level shows Claude scaling paid search investment fastest by a wide margin, even while staying the smallest in absolute dollars.

Gemini’s spend exhibited a sharp seasonal spike around December–January before settling into a lower plateau, while ChatGPT’s climb was more gradual and concentrated in the final two months of the window.

Together with the organic growth data, a consistent pattern emerges: the platform with the fastest organic app expansion is also the one ramping paid acquisition fastest.

Anthropic is treating consumer growth as a genuine priority, not leaving Claude’s momentum to chance.

Who Searches for What

Treating “AI chatbot users” as one monolithic audience misses a real difference in composition.

Comparing category share of usage across ChatGPT, Claude, Gemini, and a general Google search baseline surfaces two consistent signals.

First, programming and developer-software-related activity occupies a meaningfully larger slice of Claude’s and Gemini’s usage than it does of ChatGPT’s.

All three platforms lean more technical than the Google baseline, but Gemini’s mix skews just as technical as Claude’s, while ChatGPT’s category distribution looks closer to a general-purpose search replacement.

Second, the adult-content share is consistently the smallest piece of Claude’s usage composition, sitting below ChatGPT, Gemini, and even the general Google baseline.

Gaming follows a similar, though less pronounced, pattern.

Taken together, Claude’s usage composition appears the most work- and technical-task-weighted, ChatGPT’s the closest to a household search substitute, and Gemini’s straddles technical depth with broader reach.

What Claude’s Developer Gravity and Gemini’s Technical Skew Mean for Enterprise AI Strategy

These layered metrics carry direct consequences for enterprises deciding where to invest AI visibility in 2026 and beyond.

Similarweb’s data underscores that the AI platform market no longer answers to a single headline number; it fractures across user intent, habit formation, and monetization paths.

Claude’s over-indexing on programming and technical tasks, together with its rapidly improving retention, makes it a high-value pocket for developer-tool companies, API-first products, and technical documentation.

Gemini’s equally technical usage tilt, combined with its growing volume and tight integration into Google’s search ecosystem, positions it as a channel where commercial queries that once started in a traditional search box will increasingly flow through a conversational AI layer.

Perplexity’s decline, especially alongside the lowest stickiness in the set, is a cautionary signal for any platform that relies heavily on one-off research look-ups without building a daily habit loop.

The mix of user intent also suggests that a brand’s AI search strategy must be tuned to the platform’s audience composition, not just its raw size.

Beyond the Headline: How Multi-Metric Visibility Shapes the Next Wave of AI Adoption

The era of measuring AI platform leadership with a single market-share figure is over, and the three-dimensional lens of reach, retention, and rate offers a more durable framework for tracking both incumbents and newcomers that will emerge after this report.

No platform leads on all three dimensions simultaneously, and that distributed strength will define the next wave of competitive moves—product bundling, deeper operating-system integrations, and paid developer ecosystem plays.

As the AI landscape fractures into multiple structurally different user communities, brands that measure visibility solely inside ChatGPT are blind to the technical cohorts growing on Claude and Gemini.

Andres SEO Expert builds programmatic search strategies and AI-driven content pipelines calibrated to the real usage patterns that Similarweb’s data now makes visible.

Reach out to Andres to map your brand’s position across this evolving ecosystem; the tools for multi-platform intelligence live inside the practice of Andres SEO Expert.