What OpenAI changed
In April 2026, OpenAI rolled out a significant update to GPT-4o's retrieval and citation layer, affecting how the model selects sources for commercial and transactional intent queries.
What we observed
Across 3,200 tracked commercial intent queries, we measured the following shifts between March and April 2026:
- Pages with FAQPage schema saw a +31% increase in citation frequency.
- Pages with thin content (under 400 words) saw a -44% decrease.
- Pages with clear BLUF structure in the first paragraph saw a +27% increase.
- Pages blocked by robots.txt for GPTBot saw no change — uncited regardless of content quality.
- Pages with multiple low-quality outbound links saw a -18% decrease.
The pattern: quality signals over quantity
The April update shifted GPT-4o's retrieval weighting toward content quality signals and away from raw domain authority. Sites with high DA but thin, unstructured content saw citation drops. Sites with lower DA but well-structured, schema-rich content saw citation gains.
If your AEO score dropped in April 2026, audit your content depth first. The most common cause of citation loss in this update was pages under 400 words with no structured data and no clear BLUF structure.
What to do now
- Run an AEOvision scan and check your GPT-4o engine score specifically.
- Identify pages that lost citations — check word count, schema status, and BLUF score.
- Prioritise adding FAQPage schema to any page under 600 words you want cited.
- Rewrite introductory paragraphs on key pages to lead with the answer, not the context.