Every AI search surface in 2026, the index it grounds in, how it cites, and how to appear, in one reference. Bing powers ChatGPT Search, Copilot and DuckAssist; Google powers AI Overviews, AI Mode and Gemini; Perplexity and Claude blend multiple sources. Win the two indexes and you cover most AI answers. To get your content indexed by AI search engines, make it crawlable for their bots and rank in those two indexes: that is the whole game.
The AI search surfaces, and how to appear in each
Two indexes do most of the grounding: Bing powers ChatGPT Search, Copilot and DuckAssist; Google powers AI Overviews, AI Mode and Gemini. Perplexity and Claude blend multiple sources.
| Surface | What it is | Index | How it cites | How to appear |
|---|---|---|---|---|
| ChatGPT Search | OpenAI's web mode | Bing | Linked citations | Win Bing; answer-first content |
| Microsoft Copilot | Microsoft assistant | Bing | Linked | Bing visibility = Copilot visibility |
| Google AI Overviews | AI answer atop the SERP | Linked sources | Rank top-10 on Google (about 81% of AIO citations are top-10 results) | |
| Google AI Mode | Conversational Google | Linked | Google visibility plus clear entities | |
| Perplexity | Answer engine | Own + web | Prominent numbered cites | Structure for extraction; freshness |
| Gemini | Google's assistant | Linked | Strong Google SEO carries over | |
| Claude (web search) | Anthropic assistant | Web (multi-source) | Linked | Extractable content and entity clarity |
| DuckAssist | DuckDuckGo's AI | Bing | Linked | Bing visibility |
The practical model: win the two indexes. See how to show up in ChatGPT search, how to appear in AI Overviews, and the AI model cheatsheet.
Watch: how this works in practice
See how to actually show up in AI search engines, not just read about it.
Before a page can be cited, it has to be indexed. Confirm yours fast with the Google search operators cheatsheet.
Bookmark this AI search engines fact sheet: keep it handy for your next audit.
Each engine also expands your search through query fan-out, so coverage across the sub-queries decides whether you make the answer.
Optimise each page to be lifted with the AEO cheatsheet.
For the umbrella view across every acronym, see the AI SEO cheatsheet.
Part of all the free SEO cheatsheets.
Frequently asked questions
How do I get content indexed by AI search engines?
Two steps. First, let their crawlers in (GPTBot, OAI-SearchBot, Google-Extended, PerplexityBot) and serve clean, server-rendered HTML so the page can be read. Second, rank in the index each surface grounds in: Bing for ChatGPT Search, Copilot and DuckAssist, Google for AI Overviews, AI Mode and Gemini. Indexing makes you eligible; answer-first, extractable content is what gets you cited.
Which index does ChatGPT Search use?
Bing. ChatGPT Search runs a live Bing query, so ranking on Bing is how you get cited. Microsoft Copilot and DuckAssist also use Bing.
How do I appear in Google AI Overviews?
Rank in Google's top 10 for the query. Roughly 81% of AI Overview citations come from results already on page one, so traditional Google ranking plus answer-first, extractable content is the path.
Do all AI search engines use the same sources?
No. There are two main grounding indexes: Bing (ChatGPT Search, Copilot, DuckAssist) and Google (AI Overviews, AI Mode, Gemini). Perplexity and Claude pull from multiple web sources.
Which AI search engine sends the most referral traffic?
Across the 100 ecommerce brands tracked at StudioHawk, ChatGPT sends the most AI referral traffic, with 91 of 100 brands now receiving it, followed by Perplexity and Copilot.
Soaring Above Search
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Chief of Staff at StudioHawk, Australia's largest dedicated SEO agency. Specialising in AI search visibility, technical SEO, and organic growth strategy. Leading a team of 120+ across Melbourne, Sydney, London, and the US. Book a free consultation →