# AI Search Platforms

> How Google AI Overviews, AI Mode, ChatGPT search and other answer engines find and cite web pages — separated by what is documented and what is observed.

- URL: https://geo.casa/ai-search/
- Hub
- Reviewed: 2026-10-26

AI answer engines retrieve web pages, generate an answer, and link some of their sources. Each platform documents a different amount about how this works. Entries in this section state only what is documented, and label everything else.

## Start here

1. [Generative Engine Optimization (GEO)](https://geo.casa/foundations/geo/) — what the term means and how Google positions it.
2. [Google AI Overviews](https://geo.casa/ai-search/google-ai-overviews/) — eligibility, fan-out, reporting and controls.
3. [Configure robots.txt for AI crawlers](https://geo.casa/crawling-indexing/robots-txt-ai-crawlers/) — decide which AI crawlers may access your site.
4. [Search generative AI control](https://geo.casa/ai-search/search-generative-ai-control/) — leave AI Overviews and AI Mode without leaving Search.
5. [Google Search AI feature changes](https://geo.casa/ai-search/google-search-changes/) — what Google has changed, with dates.
6. [Preferred sources](https://geo.casa/ai-search/preferred-sources/) — how users can choose to see more of a site, including in AI features.
7. [Claim: seeding brand mentions across the web boosts AI visibility](https://geo.casa/ai-search/inauthentic-mentions/) — what Google says about manufactured mentions.
8. [Google Discover](https://geo.casa/ai-search/google-discover/) — interest-based feed: eligibility, images and the AI control.
9. [Google AI features vs ChatGPT search vs Perplexity](https://geo.casa/ai-search/ai-search-platforms/) — Google, ChatGPT search and Perplexity side by side: crawlers, opt-outs, reports.
10. [Which sources Chinese AI assistants cite](https://geo.casa/ai-search/china-ai-platform-sources/) — which sources Doubao, DeepSeek, Yuanbao, Qwen, Kimi and Wenxin cite, by date.

## Platforms

| Platform | Crawler / control documented | Wiki entry |
|---|---|---|
| Google AI Overviews & AI Mode | Googlebot; snippet controls | [Google AI Overviews](https://geo.casa/ai-search/google-ai-overviews/) |
| ChatGPT search | `OAI-SearchBot` (OpenAI) | [Configure robots.txt for AI crawlers](https://geo.casa/crawling-indexing/robots-txt-ai-crawlers/) |
| Perplexity, Copilot | — | *planned* |

## Open questions

- [Does llms.txt improve AI visibility?](https://geo.casa/tools-protocols/llms-txt/)
- [Does structured data change AI citations?](https://geo.casa/playbooks/schema-ai-citations/) (research proposal)

## Sources

- [Google Search Central: AI features and your website](https://developers.google.com/search/docs/appearance/ai-features)
- [OpenAI: Overview of OpenAI crawlers](https://developers.openai.com/api/docs/bots)