Quick answer
A generative engine optimization (GEO) strategy cannot be set once and left alone because the sources that AI answers cite can change even over a short period, following platform policy and model changes. According to Promptwatch data cited by DEPT, the share of the community platform Reddit in ChatGPT search citations fell from an average of 3.83% between July 18 and August 7, 2026 to an average of 0.52% between August 14 and 17, and the cause has not been officially confirmed. That is why GEO has to be adjusted while measuring repeatedly with the same question set.
Key takeaways
- Reddit's share of ChatGPT search citations fell from 3.83% to 0.52%.
- In the same period it fell about 11% in Google AI Overviews and about 31% in AI Mode.
- The cause of the drop in Reddit citations has not been officially confirmed.
- Spread your foundation instead of relying on one platform, source or tactic.
- Measure repeatedly with the same question set and record a time series.
How much did ChatGPT's Reddit citations change?
According to Promptwatch data cited by DEPT, Reddit's share of ChatGPT search citations averaged 3.83% between July 18 and August 7, 2026 and then fell to an average of 0.52% between August 14 and 17. That is a relative decrease of 86.4%.
ChatGPT is the conversational AI service made by OpenAI, and Reddit is a US community platform where users discuss topics in subject-based forums. Promptwatch is an AI visibility platform, and the Reddit citation share figures are from a third-party measurement tool that the global digital agency DEPT presented in a September 2026 insights article. In a June 2026 insights article, DEPT had reported that Reddit repeatedly appeared as a top cited source in AI answers.
Was the drop in Reddit citations the same on every AI platform?
No, it was not. According to Promptwatch data cited by DEPT, in the same period Reddit citations fell about 11% in Google AI Overviews and about 31% in Google AI Mode, a different scale of change from the 86.4% decrease in ChatGPT.
AI Overviews is the feature in the search results of the search engine Google in which AI summarizes multiple sources, and AI Mode is the AI search feature in Google Search that handles follow-up questions conversationally. The cause of the drop in Reddit citations has not been officially confirmed. The fact that the scale of change differed by platform shows that a change observed on one platform cannot be applied as is to another.
What did DEPT conclude from the drop in Reddit citations?
According to a DEPT insights article (September 2026), DEPT's conclusion is not to harden an observed pattern into a permanent best practice and not to mistake any single platform, source or tactic for the GEO strategy itself. DEPT recommends building the capacity to test, learn and adapt.
AI answers can differ each time even for the same question, and they are affected by platform policy and model changes. The Reddit citation drop shows that a ranking of cited sources observed at one point in time can change even over a short period.
How should brands prepare for changes in cited sources?
In the interpretation of the marketing agency StoneParty&Corp, brands should spread their foundation so that they do not rely on one platform or one source, measure repeatedly with the same question set, and review their action list at regular intervals.
The services to measure include ChatGPT, Claude, the conversational AI service from Anthropic, Perplexity, an AI search service that shows its sources, Google's AI and Naver's AI. StoneParty&Corp uses the same 20 tracking questions created at the diagnosis stage in its re-diagnosis and monthly reports, recording as a time series whether each question is cited, new citations and trends in competitor citations.
- Spread the foundation: manage together your own site with search engine optimization (SEO) fundamentals in place, consistent brand information and content across several channels
- Measure repeatedly: define a set of questions customers are likely to ask, put the same questions to several AI services at regular intervals and record the results as a time series
- What to record: whether the brand is mentioned, whether your pages are cited as sources, the competing brands mentioned alongside yours and the accuracy of the answers
- Review again: do not keep a fixed checklist; adjust action items according to the measurement results
Frequently asked questions
Now that Reddit citations have fallen, is community content no longer meaningful?
That cannot be concluded. The Promptwatch data cited by DEPT is a measurement for a specific period, the scale of change differed by platform, and the cause has not been officially confirmed. Rather than following the rise and fall of one particular source, it is more appropriate to steadily manage brand information and real-experience content across several channels.
Are there GEO standards that do not change?
Google says there are no additional requirements or special optimizations for appearing in AI Overviews and AI Mode and that existing SEO best practices apply as is. DEPT also explains in a June 2026 insights article that SEO remains the foundation. The basics are allowing crawling and indexing, an easy-to-answer structure, verifiable evidence and consistent brand information.
How often should you check your AI citation status?
There is no fixed interval, but the principle is to check at regular intervals with the same question set and look at a time series rather than a single result. Whether you are cited by AI can change with each AI platform's policy and model changes, so no one can guarantee it.
Key entities in this article
- StoneParty&Corp ( Organization )
- An AI data-driven marketing agency in Seoul that designs SEO, AEO and GEO as one structure. It is the brand agency division of DEKAM Inc. and the operator of this site. Official source: StoneParty&Corp
- DEPT ( Organization )
- A global digital agency founded in Amsterdam that publishes technology and marketing insights on its website. Official source: DEPT
- Generative engine optimization (GEO) ( Concept or service )
- The work of making content and brands more visible and more often cited in answers that generative AI builds from multiple sources. Official source: Generative engine optimization (GEO)
- Search engine optimization (SEO) ( Concept or service )
- The work of helping search engines understand content and helping people find a site through search. Official source: Search engine optimization (SEO)
- ChatGPT ( Concept or service )
- OpenAI's conversational AI service, which includes a search feature that answers with cited web results. Official source: ChatGPT
- Reddit ( Organization )
- A US community platform where users discuss topics in subject-based forums. Official source: Reddit
- Google ( Organization )
- The company behind Google Search, AI Overviews and AI Mode, which publishes official SEO guidance through Search Central. Official source: Google
- AI Overviews ( Concept or service )
- The Google Search feature in which AI summarizes multiple sources and shows them with links. Official source: AI Overviews
- AI Mode ( Concept or service )
- The conversational AI search experience in Google Search for follow-up questions and complex comparisons. Official source: AI Mode
- Claude ( Concept or service )
- The conversational AI service made by Anthropic. Official source: Claude
- Perplexity ( Organization )
- The company behind an AI search service that shows its sources; it operates PerplexityBot and Perplexity-User. Official source: Perplexity