Resoneo says ChatGPT responses began referencing about 20% fewer websites after what it identifies as the early-March transition to GPT-5.3 Instant.
The analysis comes from the French SEO consultancy and draws on data from Meteoria, an AI visibility-tracking platform that monitored 400 prompts daily over 14 weeks, producing 27,000 comparable responses.
Average unique domains per response dropped from 19 before the transition to 15 after. Average unique URLs per response fell from 24 to 19.
The URLs-per-domain ratio remained at 1 throughout the…

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