Ask ChatGPT about your store and get nothing back, or a wrong category, even though you rank fine on Google? The likely cause isn’t your content — it’s that ChatGPT’s search doesn’t read Google’s index at all. It reads Bing’s.

ChatGPT search runs on Bing, not Google

OpenAI has never published a single line-item confirming this, but the evidence is consistent and repeatable. Search Engine Roundtable reported that ChatGPT’s search results trace back to Bing’s index, verified by cross-checking server logs against citation patterns. A more rigorous test came from Seer Interactive, which pulled 500+ ChatGPT search citations across 100 queries and matched them against the same queries’ top-20 Google and Bing results: 87% of ChatGPT’s citations matched Bing’s top results, versus only 56% for Google’s. If a page doesn’t appear in Bing, it’s structurally unlikely to appear in a ChatGPT answer, independent of how it performs on Google.

We hit this ourselves. On July 6, 2026, testing our own domain (agentready.market) inside ChatGPT, the assistant reported flatly that the site wasn’t indexed — despite the site being live, crawlable and correctly tagged. Worse, ChatGPT didn’t just skip us: it guessed our category from the TLD alone (“.market” read as “marketplace”), and credited “AI agent audit” work to unrelated, already-indexed sites with similar names. Machines don’t leave a blank when they can’t find you — they fill it in, and the guess is rarely flattering.

The fix: get indexed by Bing, on purpose

Google Search Console tells you nothing about this gap — Bing runs a separate crawler with its own index, and most merchants have never opened Bing Webmaster Tools because organic Bing traffic is small. Three concrete steps:

  1. Verify your site in Bing Webmaster Tools. The fastest path is importing directly from Google Search Console: sign in with the same Google account, and Bing pulls in your verified sites and sitemaps automatically — no separate verification file or DNS record needed, and it also imports your submitted sitemap so you don’t resubmit it by hand.
  2. Submit changed URLs with IndexNow instead of waiting for a crawl. IndexNow is a free, open protocol — one ping notifies Bing (and Yandex, Naver, Seznam, Yep) that a URL was added, updated or removed, instead of waiting for the next scheduled crawl. Many CMS platforms and CDNs already support it as a plugin or built-in setting, so this is often a checkbox, not a build task.
  3. Check what’s actually landing, with Bing’s AI Performance report. Bing Webmaster Tools shipped an AI Performance report in public preview in February 2026, expanded in June 2026 with intent, topic and citation-share breakdowns — showing which of your URLs are actually being cited inside Copilot and Bing’s own AI answers. It won’t show ChatGPT citations directly (OpenAI doesn’t share that data with Microsoft), but since the index underneath is the same one ChatGPT draws from, a page that’s earning Bing AI citations is a page that’s reachable by ChatGPT too. It’s a close cousin of Microsoft Clarity Citations, which tracks the same kind of citation data from the Clarity side.

What this doesn’t fix

Getting indexed by Bing solves discovery — it doesn’t mean an agent that finds your store can then check prices, resolve a variant, or complete a purchase. That’s a separate, harder gap, and it’s the one AgentReady’s scan is built to check, not just whether you’re findable but whether an agent can actually transact once it gets there.

Sources

First-hand finding (agentready.market indexing test, July 6, 2026) is our own, unpublished elsewhere; every other claim above is sourced and linked above.