Did ChatGPT stop citing Reddit on August 14? Promptwatch measures an 86% drop in ChatGPT Search citations; our API read three days later still found reddit.com in 9 of 36 answers

What Promptwatch published

The report tracks reddit.com's daily share of all citations returned by ChatGPT Search, Google AI Overviews and Google AI Mode from July 7 to August 17, 2026, counting only responses with at least one citation. ChatGPT: "From July 18 through August 7 it held a steady 3.83% average share of ChatGPT citations, one of the largest of any domain. On August 14 the share collapsed to under 1%, and the August 14–17 average of 0.52% is a 86.4% relative drop." An earlier step is dated too: "on August 8, the same day ChatGPT changed its query fanout behavior, Reddit's share fell from the high 3s to the mid 2s." The page's summary tiles read 1.50% for the past seven days (−54.4% against the prior seven) and 3.15% for the past 30. AI Overviews: 2.37% in the first seven days of the window to 2.10% in the last seven, "a 11.3% relative decline," with "no single sharp break." AI Mode: 2.22% to 1.54%, "a 30.5% relative decline," the clearest step at the end of July (2.06% over July 22–28 to 1.78% the following week). Method, as stated: "millions of prompt responses, citations, and click data from the actual user interfaces of major AI platforms." The caveat, verbatim: "The chart shows when each change happened, not why. A shift in ChatGPT's source selection is the obvious candidate, but a data-collection issue cannot be ruled out, so treat the size of the drop as provisional while we keep monitoring." Promptwatch sells AI-visibility tracking; the report is its own data. Search Engine Land (Danny Goodwin, 2026-08-19) reported the same numbers and the same caveat.

Our read of the same engine, through the API

Every week our self-audit asks four engines the same 12 questions a small business owner asks about AI visibility, three samples each — 36 ChatGPT answers per run, via OpenAI's `gpt-5-search-api` model with its own web search, which returns the URLs it cited. We counted answers whose citation list contains a `reddit.com` URL. The four runs straddle both dates Promptwatch names (08-08 and 08-14):

On 08-17, three days after Promptwatch's cliff, ChatGPT via the API cited reddit.com in 9 of 36 answers across five of the 12 questions — two of three on "How can I check what ChatGPT says about my business?", three of three on "Which tools show how ChatGPT, Perplexity and Gemini recommend businesses?", two of three on "How do I improve my business's visibility in ChatGPT and AI search?", and one each on two more — with threads from r/SEO, r/smallbusiness, r/GEO_optimization, r/SEO_LLM and r/SaaS among the 12 reddit.com URLs. The week before it was 2 of 36; the week before that, 8. reddit.com's share of ChatGPT's cited-domain slots, 3.36% on 08-17, happens to sit where Promptwatch's pre-drop ChatGPT Search baseline sat (3.83%). Perplexity cited reddit.com in 69–89% of its answers on every run; Gemini in 6–8 of 36; Claude in none of 144. Across all four engines, reddit.com is the single most cross-question source we record — it appeared on 11 of the 12 questions in every run of the question-span cut published this morning.

Why the two reads can both be right

Promptwatch scrapes the consumer ChatGPT Search interface; we call the search-tuned API model. They share a name and, presumably, much of a retrieval stack, but OpenAI has never said they share a source-selection policy, and the RESONEO reverse-engineering of ChatGPT's retrieval found behaviour that differed by tier and mode inside the consumer product alone. Our sample is also tiny (36 answers a week on 12 questions in one topic), and week-to-week it swings between 2 and 9 on its own — a week-over-week change of that size in our series would not be evidence of anything. What the series can say is narrower and still useful: the API surface had not stopped citing reddit.com as of 08-17. If the consumer drop is real and persists, it is a change in what a ChatGPT user sees, not in what the model can retrieve.

What this means for a business that cares about AI visibility

• Ask which surface your tracking tool measures. A Reddit-citation collapse in the ChatGPT app and a steady API read are both true this week. A report that says "ChatGPT" without saying which pipe is not yet a finding you can act on.
• Reddit as a route into ChatGPT answers just became less reliable in the consumer data, and was never reliable in ours. Two of four weeks ChatGPT cited reddit.com in 2 of 36 answers. Perplexity is where Reddit threads carry weight (25–32 of 36, every week). If a Reddit thread is your plan for being recommended, it is a Perplexity plan.
• Treat the number as provisional, as its publisher does. Promptwatch's own next step — compare the Reddit URLs cited before and after August 14 — is the right one, and it is the one we will take on the API side: the 08-24 self-audit run is pre-registered here as the next read. If ChatGPT's reddit.com answers fall to 2 of 36 or fewer on 08-24 we will say the API surface followed; if they stay at 6 or more, it did not.

A free check shows which sources ChatGPT, Perplexity, Gemini and Claude cite when asked about your business today — including whether any of them is a Reddit thread you do not control.