Anthropic’s Claude posted its strongest month yet in SimilarWeb’s generative AI traffic tracker, climbing to 11.5% of worldwide website traffic share in October 2026, up nearly two full percentage points from 9.6% in September. The gain came directly at the expense of the two market leaders — ChatGPT slipped to 55.7% from 56.4%, and Gemini fell to 24.2% from 25.0%, marking the first month in a while where Claude’s advance outpaced both of its larger rivals simultaneously.
A Steady Climb Through 2026
A year ago, in November 2025, Claude was barely a factor in the generative AI traffic conversation, holding just 2.1% of worldwide share — behind DeepSeek, Grok, and Perplexity. ChatGPT commanded 69.5% of traffic at the time, with Gemini a distant second at 15.9%.
That picture has changed considerably. By April 2026, Gemini had climbed to 26.7% of traffic, putting it at roughly half of ChatGPT’s 53.7%, while Claude had already reached 8.0% — a nearly fourfold increase from where it stood six months earlier. The platform’s rise through the first half of 2026 was sharp enough that SimilarWeb data from May showed Claude nearly tripling its share in a single year, moving from 1.6% to 8.9%, with Anthropic’s assistant adding nearly three percentage points in just three months at one point.
Claude’s growth continued through the summer even as the ChatGPT-Gemini rivalry dominated headlines. In August, Claude sat at 9.3% of traffic, then edged up to 9.6% in September — a month in which Gemini posted its fourth consecutive monthly decline while ChatGPT clawed back some of the ground it had ceded earlier in the year.
October’s Numbers
The nearly two-point jump is Claude’s largest single-month gain since the burst of growth it saw earlier in the year, and it’s notable for coming while both ChatGPT and Gemini lost ground at the same time — a departure from the pattern of recent months, where gains for one of the two leaders tended to come at the other’s expense rather than Claude’s.
Claude has now more than quintupled its traffic share over twelve months, going from 2.1% last November to 11.5% today, a faster rate of proportional growth than either ChatGPT or Gemini has managed over the same stretch. It’s also pulled further ahead of the rest of the field — DeepSeek, Grok, Copilot and Perplexity have all been essentially flat or declining for months, leaving Claude as the only platform outside the top two with any real momentum.
The Bigger Picture
Website traffic share doesn’t capture the full competitive picture — engagement depth, daily active usage, and app downloads all tell their own stories, and ChatGPT has historically maintained a meaningfully higher DAU/MAU ratio than its rivals. But as a consistent, apples-to-apples read on where people are going for generative AI on the open web, the SimilarWeb numbers have become one of the more closely watched monthly indicators in the space.
For most of 2026, that story was about Gemini eating into ChatGPT’s dominance, a trend that pushed Gemini’s share above 25% as early as March before its growth began to plateau and reverse later in the year. October’s data suggests a third act may be underway, with Claude now positioned as the platform taking share from both of the market’s incumbents at once rather than simply trailing in their wake.
Whether that’s the start of a sustained trend or a one-month blip will become clearer in the coming months, but for now, Claude’s October numbers could be a sign that the generative AI traffic race could end up becoming a three-way contest.