Claude Overtakes Rivals as Fastest-Growing AI Traffic Source

According to fresh data from SE Ranking, Claude has emerged as the fastest-growing AI traffic source, sending nearly four times more referral traffic to websites in April than it did in January. Despite this explosive growth, the platform remains the smallest among the five tracked AI sources and likely isn’t a significant line item in most analytics yet.

For context, SE Ranking sells AI visibility tracking tools, and its figures come from its own Google Analytics dataset.

What the data reveals is striking. Claude’s share of traffic in SE Ranking’s dataset jumped from 0.0029% in January to 0.0141% in April, representing a 386% increase. The bulk of this surge occurred in March, when Claude’s share rose from 0.0049% to 0.0127%. SE Ranking notes this is the largest single-month jump for Claude in its dataset’s history.

Across all AI platforms combined, traffic accounted for 0.33% of total referrals as of April, up from 0.1976% a year earlier. Within that, ChatGPT dominated, generating 78.23% of AI-referred traffic over the full 16-month period. Perplexity followed at 9.33%, Gemini at 6.85%, and Copilot at 3.57%. Claude’s share sits at 1.40%.

Between January and April, ChatGPT’s referral traffic grew just 1.53%, while Gemini surged 63%. The same dataset shows Gemini overtaking Perplexity earlier this year.

SE Ranking ties the March spike to public attention on Anthropic in February. The company publicly stated it would not allow Claude to be used for mass surveillance of Americans or fully autonomous weapons, a declaration made during a dispute with the Pentagon over Claude’s usage restrictions.

The report also cites external data supporting the trend. Similarweb data shows Claude reached 11.3 million daily active users on mobile in early March. Meanwhile, Ramp’s AI Index, based on corporate spending data, reports Anthropic adoption at 34.4% of businesses, compared with 32.3% for OpenAI.

One notable omission from SE Ranking’s analysis is OpenClaw, the open-source agent framework that runs on Claude models. OpenClaw was one of the biggest Claude-related stories during this same period. Launched in November, it hit 247,000 GitHub stars by early March, and observers called it the fastest-growing project in GitHub history. Anthropic restricted subscription access for third-party harnesses, starting with OpenClaw, on April 4.

This is additional context rather than an explanation for the referral numbers. Agent activity doesn’t register as clicks from claude.ai to websites, so OpenClaw usage wouldn’t appear in this dataset. It’s another type of Claude activity that referral reports can’t capture.

The US is about ten months ahead of other regions in this trend. While the growth pattern looks similar across regions, the US leads on both scale and timing. In April, Claude accounted for 0.0186% of US website traffic in the dataset, compared to 0.0100% in the EU and 0.0054% in the UK. US websites reached a Claude traffic share of 0.0022% in April 2025, while other regions didn’t hit a similar level until early 2026.

Why this matters is about perspective. The percentage increase makes the growth appear larger than the traffic behind it. A nearly 4x increase still leaves Claude with a tiny fraction of referral traffic. These numbers serve as an early signal to watch, not something to react to just yet. SE Ranking notes its data captures only direct clicks from AI platforms, and Claude is used mainly for writing, coding, and analysis, not search.

Looking ahead, the next monthly updates will reveal whether Claude’s March jump was a new baseline or a temporary spike. If it holds, sites with US audiences will likely feel any change first. Positions have already shifted this year, with Gemini passing Perplexity in the same dataset.