Copilot Can No Longer Be Measured. Microsoft's AI Answer Now Lives in Bing.

AI assistants are not a stable surface. On October 8, 2026, Microsoft Copilot started requiring a login. Since then, it no longer answers logged-out users, and its public answer can no longer be measured.

For a brand, the question has not moved. What it wants to know is what Microsoft's AI tells people about it. That answer still exists. It has simply moved into Bing search.

What happened to Copilot?

Since October 8, 2026, Copilot has required a login. Microsoft now blocks logged-out sessions: a user who does not sign in no longer gets an answer.

Nanga measures the public answer, the one a logged-out user gets. For Copilot, that answer no longer exists. Microsoft's still does.

Where does Microsoft's AI answer now?

In Bing. Microsoft shows an AI-generated answer there that it calls Copilot Search in Bing, at bing.com/copilotsearch. Nanga calls it Bing AI Mode, by analogy with Google AI Mode.

That is where someone searching within Microsoft's ecosystem gets a synthesized answer with cited sources. For a brand, it is the right surface to track.

Same model or a new one: what happens to your history?

The Copilot that Nanga measured is simply no longer available from Microsoft to a logged-out visitor. There is no public answer left to collect there.

That raises a simple question: is Bing AI Mode the same model as Copilot under another name, or something else?

Something else. Bing AI Mode is a different model: an answer built into Bing search, not the Copilot assistant. Nothing says it reads the same pages or cites the same brands. Putting its curve at the end of Copilot's would show a rise or a drop caused by the change of model, not by your brand.

In practice, in Nanga:

• your Copilot history stays available, exactly as collected;
• the Bing AI Mode curve starts from zero at its first collection;
• the two show up as two distinct models, never as one continued curve.

Semrush has reached the same conclusion. According to PPC Land, Semrush wrote to its Enterprise AIO customers on October 28, 2026 that it would stop tracking Microsoft Copilot on November 9, 2026, citing "recent changes to Microsoft Copilot's access requirements". Semrush has not announced a replacement: its customers choose between getting back the prompts allocated to Copilot and keeping their Copilot history. Either way, the Copilot history ends where collection ends, and nothing extends it.

For a few weeks, the Bing AI Mode curve will be short. A visible break beats a manufactured trend.

What changes in Nanga?

From the week of November 9, 2026, Nanga GEO tracks Bing AI Mode as a new model. It replaces Copilot on every project that tracked it, about forty in all. The switch was made before Copilot's announced shutdown.

Customers have nothing to do. One model replaces another, and the quota stays the same.

What does this change?

Bing AI Mode is fed by Bing's index. The levers are those of SEO on Bing, applied to the pages the AI cites:

1. Check that Bing sees your site. Bing Webmaster Tools shows what is indexed and what is not. Many teams only watch Google Search Console.
2. Get your updates picked up faster. IndexNow lets you notify Bing of a new or changed page without waiting for its crawler's next visit.
3. Be where Bing AI Mode looks. In your category, the domains each AI cites are visible in Nanga's sources view, model by model.
4. Read the new curve for what it is. A starting point, not a fall or a recovery compared with Copilot.

The lesson goes beyond Microsoft. An AI can change its address, its access rules or its sources overnight. What matters is tracking the answer your customers actually get, wherever it lives, and knowing when a series starts over.

To see what Bing AI Mode and other AIs say about your brand: request a demo.

Frequently asked questions

Sources:

• Semrush, reported by PPC Land, Semrush drops Copilot from AI visibility tracking on November 9, October 2026.