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Why did Google's AI Mode stop citing sources on Gemini 3.8 Flash? Google says it was "not working as intended" and rolled out a fix the morning after
For roughly a day after Google added Gemini 3.8 Flash to AI Mode, subscribers who picked that model got answers with no links and no citations. Google's VP of Product for Search called it a bug and said a fix would roll out; Search Engine Land reports the links were back the next morning. The free, default AI Mode model was not affected. Both trade reports and the wording of Google's reply are quoted below; Google's own post on X returned HTTP 403 to our fetch, so the statement is taken as the two outlets printed it.
What happened, in order
On 2026-09-02 Google announced Gemini 3.8 Flash and made it selectable in AI Mode for Google AI Pro and Ultra subscribers; Search Engine Roundtable's rollout note that day reads "This will work in Google Search's AI Mode for Google AI Pro & Ultra subscribers globally." We covered the launch in yesterday's post.
On the morning of 2026-09-03, Search Engine Roundtable reported the first day of use: "the early feedback is that AI Mode running Gemini 3.8 Flash is not link or citation friendly. Meaning, AI Mode with Google's latest AI model is less likely to cite sources and link to sources than previous models." The examples were screenshots posted on X by Gagan Ghotra, described as "searches he conducted in AI Mode for top-of-the-funnel queries, and none of them showed any links or citations," and a side-by-side from Glenn Gabe of the same query on 3.8 Flash and on the default model.
That evening Search Engine Land published Google's reply. Its summary: "Google launched Gemini 3.8 Flash yesterday and incorporated it into AI Mode for Google AI Pro & Ultra subscribers but there was an issue with this model – it didn't link or cite sources within its AI responses." Robby Stein, VP of Product at Google Search, responded on X: "Hey — thanks for flagging. This isn't working as intended, and we'll roll out a fix soon." Search Engine Roundtable appended the same reply to its report.
Search Engine Land's article carries two further lines. On scope: "this bug only impacted those using Gemini 3.8 Flash, which was only paid subscribers at this point." On resolution, added 2026-09-04: "This was fixed the following morning," quoting Glenn Gabe: "OK, looks like Gemini 3.8 Flash is now providing links. When it first rolled out, there was a bug and there were barely any links being provided."
What we can and cannot verify
| Claim | Where it is stated | Our read |
|---|---|---|
| Gemini 3.8 Flash in AI Mode for AI Pro and Ultra subscribers from 2026-09-02 | Google's launch post; Search Engine Roundtable 09-02 | Both pages fetched, dates confirmed |
| AI Mode answers on 3.8 Flash showed no links or citations | Search Engine Roundtable 09-03, with screenshots from two SEOs | Report and screenshots read on the page; we did not reproduce the answers ourselves |
| "This isn't working as intended, and we'll roll out a fix soon." | Robby Stein on X, quoted by Search Engine Land and Search Engine Roundtable | Identical wording on both outlets; the X post itself returned HTTP 403 to our fetch |
| Only the paid-subscriber model was affected | Search Engine Land | Consistent with the model being subscriber-only; not independently tested |
| Fixed the morning of 2026-09-04 | Search Engine Land update, quoting Glenn Gabe | One outlet, one practitioner; no Google statement of the fix at the time of writing |
Why it matters for AI visibility
- Citations in AI Mode are a property of the model that answered, not of the product. The same query, the same day, gave a cited answer on the default model and an uncited one on 3.8 Flash. A visibility read that does not record which model answered cannot be compared across days.
- Google treats missing links as a defect. "Not working as intended" is the clearest public statement so far that sources and links are an intended part of an AI Mode answer, which is the condition under which a business can be found from one at all.
- A single-day read can go to zero for reasons that have nothing to do with your site. If a client's AI Mode citations vanished on 2026-09-03, the first question is which model the person was using; the second is whether they come back after 09-04. Our free 60-second check reads whether each engine names your business when a buyer asks, and it is worth re-running on the day after a model change rather than the day of.
Limits
- The evidence for the bug is practitioner screenshots reported by two trade outlets, plus Google's acknowledgement. We did not query AI Mode on 3.8 Flash ourselves; our audit reads ChatGPT, Claude, Gemini and Perplexity through their APIs, not AI Mode.
- The fix is reported by one outlet quoting one practitioner. Google's reply promised a fix; it has not, in the pages we read, confirmed one shipped.
- How many queries or subscribers were affected is not stated anywhere we found.
Why did AI Mode stop showing links and citations after Gemini 3.8 Flash launched?
Google says it was a bug. Robby Stein, VP of Product for Google Search, replied to reports on X on 2026-09-03: "This isn't working as intended, and we'll roll out a fix soon." The behaviour was reported by Search Engine Roundtable and Search Engine Land from SEO screenshots of AI Mode answers on the 3.8 Flash model with no links or citations.
Were free AI Mode users affected?
According to Search Engine Land, no: "this bug only impacted those using Gemini 3.8 Flash, which was only paid subscribers at this point." The default AI Mode model kept citing sources.
Has the AI Mode citation bug been fixed?
Search Engine Land reports it was "fixed the following morning," 2026-09-04, citing Glenn Gabe: "OK, looks like Gemini 3.8 Flash is now providing links." We have not seen a Google statement confirming the fix.
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