How Google Gemini Became the Second‑Largest AI Referral Source

According to Similarweb‑based analyses, ChatGPT’s share of generative‑AI web traffic fell from roughly 86–87% in early 2025 to around 64–65% by early 2026.

During the same period, Gemini grew rapidly—from about 5–6% of traffic to more than 20% of the market.

Some measurements later in 2026 show the gap narrowing further, with ChatGPT around 56.7% of generative‑AI tool web traffic and Gemini about 25.5% depending on dataset and measurement period.

The differences across reports reflect different methodologies (web traffic vs. referrals vs. app usage), but the overall direction is consistent: ChatGPT remains dominant, yet the market is becoming far more competitive.

Rapid Growth in the Overall AI Market

The shift is not happening because AI usage is declining—quite the opposite. The total market for AI assistants is expanding quickly.

Similarweb data shows visits to AI platforms grew about 28.6% between January 2025 and January 2026, meaning even platforms losing share may still be gaining users in absolute terms.

This dynamic explains why ChatGPT can lose relative share while still growing in total usage.

Claude and Other Assistants Are Also Growing

While Gemini is the biggest challenger to ChatGPT, it is not the only one gaining ground.

Data summaries show Anthropic’s Claude increasing its share several‑fold over the past year, though it still remains far smaller than the two leaders in overall web traffic.

Other platforms—such as Microsoft Copilot, Perplexity, Grok, and DeepSeek—each capture smaller slices of the market. Together they contribute to a rapidly diversifying AI ecosystem.

Why Gemini Is Growing So Quickly

Several factors explain why Gemini’s growth has been unusually fast compared with most AI competitors.

1. Massive Product Distribution

Unlike standalone AI tools, Gemini is embedded across Google’s consumer ecosystem—including Search, Android, Chrome, Gmail, and Workspace tools. This distribution gives the system exposure to billions of users and makes it easy for people to encounter AI features without installing a separate app.

2. Huge Existing User Base

Google reported that the Gemini app alone had more than 750 million monthly active users by late 2025, giving it one of the largest potential audiences of any AI assistant.

3. Integration Into Search‑Driven Discovery

Gemini is increasingly connected to Google’s information‑discovery systems. When users interact with AI responses and follow links to sources, those interactions can translate into referral traffic for websites.

That connection between AI answers and the open web is why analytics firms are now measuring “AI referrals” as a new traffic category.

The Big Picture: AI Discovery Is Fragmenting

Early in the generative‑AI boom, ChatGPT effectively dominated the market. Many analysts now describe that period as ending.

Recent market analyses say the landscape has shifted from near‑monopoly to a fragmented ecosystem of competing assistants, each capturing different use cases and audiences.

In practice, this means:

• ChatGPT remains the largest AI gateway to the web
• Gemini is rapidly becoming the second major discovery platform
• Other assistants are building smaller but meaningful niches

For publishers, marketers, and product teams, the implication is clear: visibility in AI answers is no longer tied to a single platform. The discovery layer of the internet is increasingly distributed across multiple AI systems.

And based on current growth trends, Gemini is likely to remain the most significant challenger to ChatGPT’s dominance in the near future.