Over the past six months, studies on "how AI actually drives traffic" have piled up, and the numbers seem to contradict each other. But stack a few 2026 reports together and a clear conclusion emerges: ChatGPT has the loudest voice, yet the centre of AI discovery is still Google. For SMBs and agencies, that decides where to spend your limited GEO (generative engine optimisation) effort in the back half of the year.
Two key numbers. First, ChatGPT now takes about 92.4% of standalone AI-assistant referral traffic (up from ~84% in late 2025). Second, that same Previsible 2026 State of AI Discovery report finds Google's own AI discovery (AI Overviews plus AI Mode) drives more traffic than all LLM assistants combined. Both are true: ChatGPT is the biggest standalone LLM, but across the whole AI-referral map, Google is still the centre.
What the Reports Actually Say
Combine the 2026 findings: ChatGPT's referral share is above 90%, but 28.8% of its referrals go to its own search results pages, not the page that answers the query and closes the sale — a loud voice isn't the same as sending a customer to your checkout. Meanwhile Google's AI Mode is now a default tab in Google Search and has started showing ads in roughly one of every three queries — that surface is monetising fast, which also means it's mainstream. Among other models: Claude quietly overtook Perplexity in March 2026, up ~64x since late 2024; Gemini grew ~3.2x to become the second most visible after ChatGPT. The map is moving, but the centre hasn't left Google.
Immediate Actions for Three Reader Types
- SMB owners: First make sure Google's AI can read you — complete Business Profile, structured data on the site, clear answers to key questions. Far better value than chasing ChatGPT exposure.
- Agencies / studios: Package an "AI-readiness audit" as a standard service: structured data, FAQ blocks, citable writing, Business Profile. Cover Google AI and traditional SEO in one pass.
- Marketing / content leads: Weekly, ask 5–10 target questions in Google AI Mode, ChatGPT and Perplexity and log whether the brand is mentioned. Decide priorities on real data, not vibes.
Engine-by-Engine Comparison
| Engine | Referral footprint | Reliance on SEO | What SMBs should do |
|---|---|---|---|
| Google AI Overviews + AI Mode | Combined exceeds all LLM assistants; centre of AI discovery | High: extends search-ranking logic | Structured data, Business Profile, citable content (priority) |
| ChatGPT | ~92.4% of standalone-LLM referral, but 28.8% to its own search pages | Low: less tied to traditional ranking | First-hand, authoritative, widely cited content |
| Perplexity | Citation-forward; overtaken by Claude in Mar 2026 | High: ~90% aligned with SEO | Solid SEO, clearly structured content |
| Gemini / Claude | Gemini second; Claude surging on agentic/enterprise use | Medium | Keep content accurate and structured to get covered |
What the Reports Won't Tell You
The easiest way to be misled is to treat "referral share" as "how much effort to invest." ChatGPT owns 90% of referrals yet sends nearly a third back to its own search pages — being mentioned isn't being handed a customer. The metric to chase isn't "which AI is hottest" but "which AI delivers buyers to your conversion page." For a one-person marketing team, that means: rather than spreading across every model, saturate Google first — still central, and it reuses your existing SEO assets.
The No-SaaS-Subscription Alternative for SMBs
You don't need an expensive AI-visibility monitor. Low-cost path: list your 5–10 most important customer questions, ask each in the three big AIs weekly, and log "mentioned? facts right? who did it cite?" in a spreadsheet. Meanwhile write your site FAQ in Q&A format and add Google's recommended structured data. Both cost zero subscription yet feed traditional SEO and AI citations. Business takeaway for ScriptWalker: bundling an "AI-readiness audit + structured-data rollout" as a one-off project is the easiest-to-sell, most tangible entry service right now.
FAQ
Should I optimise for ChatGPT or for Google's AI?
Put Google's AI Overviews and AI Mode first. Reports show AI discovery inside Google drives more traffic than all standalone LLM assistants combined. ChatGPT is the biggest standalone LLM, but nearly a third of its referrals go to its own search pages, not a page that converts. With limited resources, bet on Google first, then ChatGPT.
I'm a local small business — do I really need to do this for 'AI citations'?
Yes, but be practical. Spend on three low-cost things: a complete Google Business Profile, structured data on your site, and first-hand content that directly answers questions. All three serve traditional SEO and AI citations at once — not extra work.
Does structured data (Schema) actually help? Can I do it without an engineer?
Yes — it helps AI correctly read your page's key facts (hours, prices, FAQs, reviews). Most CMSs have plugins that generate basic Schema without code, but make sure the values are real and match the page; wrong Schema hurts you. Bring in a vendor for site-wide or advanced types.
Should I pay for an 'AI visibility monitoring' tool?
Not yet. A small company can do it manually: take 5–10 questions you most want to be found for, ask each in ChatGPT, Perplexity and Google AI Mode weekly, and log whether you're mentioned and whether the facts are right. Once AI-driven enquiries justify it, consider a paid monitor.
My Take
My view: chasing "visible in every LLM" is a misallocation. For a lean SMB, the right order is to saturate Google's AI surfaces first — the largest traffic source and one that reuses your existing SEO and Business Profile at the lowest marginal cost. The counterpoint deserves a hearing: ChatGPT's growth curve is steep, and if your audience skews young or B2B and reaches for ChatGPT directly, seeding first-hand authoritative content early is a real first-mover edge — and the "referrals back to its own search" ratio could change. The strategy isn't either/or; it's ordering: Google first, then add ChatGPT based on your audience.
Sources
- Previsible: 2026 State of AI Discovery Report (primary report)
- Real Internet Sales: Previsible 2026 AI Discovery Report analysis (primary quote)
- Google Search Central: AI features and your website (primary docs)
- Adapt Worldwide: AI Search Roundup, June–July 2026 (third-party)
- Anicca: Weekly Search Update, 16 Jul 2026 (third-party)