Alphabet’s third quarter was strong at group level. Revenue grew 25% year-on-year to USD 127.6bn, the fastest pace since 2021, carried by Google Cloud, which more than doubled to USD 30.7bn on the back of AI infrastructure demand and TPU system sales. Operating income rose 30% and the Gemini app crossed one billion users.

Investors focused elsewhere. Search & other, still Alphabet’s largest and most profitable franchise, grew 12% to USD 63.35bn, short of the roughly USD 65.0bn the market expected. Total advertising rose 11% to USD 82.0bn, also below forecasts. The disappointment was compounded by an EPS miss (USD 2.12, depressed by an USD 8.7bn loss on equity holdings), negative free cash flow of USD 9.1bn (including a USD 5.2bn payment for a 2018 EU fine) as quarterly capex hit USD 51.4bn, and the shares fell more than 9% in after-hours trading.

Search growth had been running in a 17–19% band since late 2025, helped by AI Overviews and AI Mode. Q3 fell well below (chart 1). For the first time in this cycle, Search accounted for less than half of Alphabet’s total revenue. This partly reflects Cloud’s surge, but also a cash engine that is no longer accelerating.

Chart 1: Search growth has dropped out of its 17–19% range. Source: Alphabet earnings releases.

Sundar Pichai stressed that AI features are driving overall query growth, including commercial queries, at the highest rate in five years. With volumes growing faster and revenue growing slower, revenue per query is falling.

The market is debating several explanations, which are not mutually exclusive. First, AI-generated answers are harder to monetise than ten blue links: when Google summarises the answer at the top of the page, users have fewer reasons to click on organic results or on ads. Second, comparisons are tougher after a very strong 2025. Third, and most relevant to this article, advertisers may be testing new AI surfaces with part of the budgets that previously went entirely to the Google auction.

On the call, management went on the defensive. Chief Business Officer Philipp Schindler named FX as the largest driver of the slowdown versus Q2, along with sector effects: APAC retailers hit by the end of the EU’s de minimis exemption, and a Q2 boosted by the World Cup. Some of these points are fair, but they do not change the debate. FX was only a slight headwind year-on-year and, by our rough estimate, does not explain the majority of the step-down. Search revenue was flat quarter-on-quarter, against a 4% rise a year earlier. Schindler conceded the key point: AI Mode is growing fast but monetises less well.

Chart 2: Q3 2026 year-on-year growth by business line. Source: Alphabet Q3 2026 earnings release.

ChatGPT has long been seen as the main threat to Google because of what Google sells. Search advertising monetises intent. When a user types “best travel insurance for Thailand” or “compare 65-inch OLED TVs”, they reveal precisely what they want at the moment they are ready to act. Advertisers bid in a real-time auction to appear next to that query and pay only when the user clicks. No other medium captures purchase intent as directly, and search has become the most profitable advertising format to date.

Revenue is also highly concentrated. Most queries like weather, sports scores, or trivia carry little to no ad value, while a minority of commercial queries in travel, finance, retail, insurance and healthcare generate the bulk of it. An AI assistant therefore does not need to replace Google. It only needs to capture a meaningful share of the research, comparison and shopping conversations at the top of the purchase funnel.

This is the disintermediation risk. In ChatGPT, the user asks, the model answers and, until this year, there was no auction at all. A commercial question answered inside a chatbot never reaches Google’s ad marketplace. Google also faces an “innovator’s dilemma”: to defend usage, it must offer AI answers of its own, which can cannibalise the click-based format that funds the company.

Management is not in denial. Past incumbents have shelved their own breakthroughs: Xerox PARC invented the graphical interface, and Apple and Microsoft commercialised it. Alphabet has done the opposite. It has put AI Overviews and AI Mode at the centre of Search, sells ads inside them and markets Gemini as a way to search, accepting that this cannibalises its own format.

So far, the evidence of a mass exodus is limited. Google still handles roughly 90% of conventional searches worldwide according to StatCounter, and ChatGPT generated only around 0.24% of combined Google-plus-ChatGPT referral traffic in August 2026. But habits are shifting at the margin, as ChatGPT now claims 1.2 billion weekly users, and Meta AI, built into WhatsApp’s search bar and Meta’s other apps, already reached around one billion monthly users by mid-2025. The real risk is that these assistants capture the most valuable intent and then learn to monetise it.