OrganiqAI traffic index: what share of website sessions comes from AI assistants?
· Organiq · September 2026 edition
In September 2026, the median site connected to Organiq got 7.3% of its Google Analytics 4 sessions from AI assistants such as ChatGPT, Perplexity, Gemini, Copilot and Claude (middle half of sites: 0.0% to 11.3%; 8 sites). ChatGPT accounted for 95.0% of those AI sessions. Aggregated, anonymous GA4 data from sites whose owners opted in.
What is the Organiq AI traffic index?
The Organiq AI traffic index is a monthly, aggregated and anonymous measure of the share of website sessions that arrive from AI assistants, calculated from the Google Analytics 4 data of sites connected to Organiq whose owners agreed to take part.
Each edition covers one calendar month and gives the median share across sites, the middle half of sites, the split by assistant and the change from the previous month. No site, domain or account is ever named.
What did the September 2026 edition show?
| Measure | September 2026 |
|---|---|
| Sites in the sample | 8 |
| Median share of sessions from AI assistants | 7.3% |
| Middle half of sites (25th to 75th percentile) | 0.0% to 11.3% |
| Sessions in the sample, all sources (sum) | 2,547 |
| Sessions from AI assistants (sum) | 261 (10.3% of the sum) |
| Change in the median since August 2026 (sites present in both months: 6) | +2.3 percentage points |
| Change in AI sessions since August 2026, same sites | +143.9% |
| Days with data | 30 of 30, through |
Sessions by assistant, September 2026
| Assistant | Sessions (sum) | Share of AI sessions | Sites with at least one session |
|---|---|---|---|
ChatGPT (chatgpt.com) | 248 | 95.0% | 5 |
Gemini (gemini.google.com) | 6 | 2.3% | 3 |
Microsoft Copilot (copilot.microsoft.com) | 5 | 1.9% | 1 |
Perplexity (perplexity.ai) | 2 | 0.8% | 2 |
Median and percentiles are taken over each site's own share; sums add every site's sessions. Organiq, GA4 data of opted-in sites, September 2026.
How is the index measured?
- Source. Sessions from Google Analytics 4, synced daily by Organiq. A property enters only if it has GA4 connected, is active and its owner opted in; participation is set per property.
- What counts as an AI session. A GA4 session whose source is one of these assistants:
chatgpt.com,perplexity.ai,gemini.google.com,copilot.microsoft.com,claude.ai,bing.com/chat,you.com,phind.com,poe.com. Variants GA4 reports for the same product are merged (for example chat.openai.com into chatgpt.com). - Share per site. AI sessions divided by all sessions of the site in the calendar month. The index reports the median of those shares and the 25th and 75th percentiles, so a large site does not outweigh the rest.
- Who qualifies. A site needs at least 30 sessions in the month, and an edition is published only with at least 5 sites.
- Change from the previous month. Compares only the sites that qualify in both months.
- Schedule. Calculated automatically on the 2nd of each month for the month that just closed.
How has the index changed over time?
| Month | Sites | Median share | Middle half |
|---|---|---|---|
| September 2026 | 8 | 7.3% | 0.0% to 11.3% |
| August 2026 | 6 | 7.5% | 3.4% to 8.6% |
| July 2026 | 5 | 0.0% | 0.0% to 2.8% |
The same editions as JSON: organiqgeo.com/ai-traffic-index.json. Past months are recalculated on the next runs while Google Analytics 4 finalizes late data, so a figure can move slightly.
What does the index not show?
- It is not a sample of the web: only sites connected to Organiq whose owners opted in take part, so it cannot be read as the share for all websites or for any industry.
- It counts sessions that carry an AI assistant as the source. A visit that arrives without a referrer is recorded as direct and is not counted, so the share is a floor.
- It counts people who clicked. Citations without a click, AI crawlers and impressions in AI answers are different measures and are not mixed in.
- With few sites, one site can move the median; read the middle half and the number of sites together with it.
Frequently asked questions
What counts as a session from an AI assistant?
A Google Analytics 4 session whose source is ChatGPT, Perplexity, Gemini, Microsoft Copilot, Claude or another assistant in the list above. Sessions without a referrer are recorded as direct and are not counted.
Why the median and not the average?
The median is the share of the site in the middle, so a very large or very small site does not pull it. The 25th and 75th percentiles show how far apart the sites are.
Does this show the share for all websites?
No. Only sites connected to Organiq whose owners opted in are included, and each edition states how many sites it covers. Use it as a reference point, not as a market total.
How does a site take part or leave?
Participation is optional and set per property by the account owner. Write to youssefpmat@gmail.com and the property is added or removed from the next edition. No site, domain or account is ever named.
Does the index count AI crawlers such as GPTBot?
No. Crawlers do not run the Google Analytics 4 tag, so they never appear in these sessions. The index measures people who arrived from an assistant.
How often is it updated and how do I cite it?
Once a month, on the 2nd, for the month that just closed. Cite as: Organiq AI traffic index, September 2026, https://organiqgeo.com/ai-traffic-index.