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Top Domains Cited by LLMs: September 2026
Ahrefs Brand Radar's September snapshots show Reddit overtaking YouTube on Perplexity for the first time, google.com rising to 12.5% in AI Mode, and ChatGPT leaning harder on health and institutional sources as dictionary sites fall back.
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GPT-5.6 Luna Is Now ChatGPT's Free Default — What That Changes for AI Visibility
OpenAI made GPT-5.6 Luna the default for Free and Go users in the week of 6 August 2026, with unlimited text chats to follow. The model most buyers actually use is no longer the flagship — and measurement programs that only test Sol will misread ChatGPT Search.
- Article
Generative UI Is Coming to AI Overviews — Calculators Inside the Answer Beat Your Tool Page
Google began rolling generative UI from AI Mode into AI Overviews in a late-August back-to-school announcement. Custom layouts, simulations, and interactive tools now compete with pages whose traffic depended on being the calculator. Zero-click just got a UI, not only a paragraph.
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Google's Preferred Sources Button Is a Reader Lever for AI Overviews — Not a Ranking Hack
On 20 August 2026 Google shipped an embeddable Preferred Sources button and said readers have selected more than 600,000 unique sources. Preferred domains can badge in AI Overviews and AI Mode for those users. That is personalization, not a global citation boost.
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ChatGPT's Reddit Citations Collapsed 86% in Days — Retrieval Changed, Not Just Reputation
Promptwatch measured Reddit at 3.83% of ChatGPT Search citations through 7 August, then 0.52% by 14–17 August. The drop was ChatGPT-specific. Trackers also logged a jump in site:-scoped fan-out queries. Community-as-universal-AEO-channel is now an engine-specific bet.
- Article
Gemini 3.7 Flash Is Now Selectable in AI Mode — Re-Baseline Before It Becomes Default
Google added Gemini 3.7 Flash to AI Mode for Pro and Ultra subscribers on 14 August 2026, one day after calling it the most intelligent Flash workhorse yet. Flash models have a habit of becoming Search's production default. Treat the menu option as an early-warning system for citation drift.
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