21 August 2026
ChatGPT citations from Reddit drop sharply in recent weeks
First reported
Simon Willison ran this on , a day before the next source picked it up.
- Reddit went from roughly 4 percent of ChatGPT's cited sources to 0.5 percent since mid-July, according to citation tracking.
- The change appears intentional but OpenAI has not publicly explained why it reduced Reddit's prominence in responses.
- Researchers cannot yet confirm the mechanism behind the shift by examining ChatGPT's internal instructions, suggesting the change may be recent or hidden.
Where they differ
Superhuman reported a specific 86 percent drop in Reddit citations with dates, while Simon Willison emphasized that the underlying cause remains unconfirmed because researchers cannot see the technical implementation.
Reddit's share of ChatGPT citations dropped dramatically from nearly 4 percent to roughly 0.5 percent since mid-July, marking an abrupt reversal of Reddit's historical status as one of the most-cited sources for AI chatbots. OpenAI has not explained the shift.
On August 18th, Promptwatch reported that ChatGPT appeared to have greatly reduced the likelihood of using Reddit in search results. The newsletter notes that attempts to confirm this through system prompt analysis have been unsuccessful, as relevant changes are not yet visible in available leaked system prompt collections.