When ChatGPT generates an answer to a question, it refers to two different pools of resources: training data and real-time web search. Training data covers content published on the internet until mid-2024. Real-time search works through Bing. Therefore, there are two separate dimensions to making your site visible to ChatGPT.
A Solid Foundation in Bing is Essential
For real-time queries, ChatGPT uses the Bing index. Check via Bing Webmaster Tools if Bing has properly indexed your site. A page that ranks well on Google might not be indexed at all on Bing — this situation is much more common than you think.
Content Format Determines Sourcing
When ChatGPT answers a question, it prefers pages that have directly provided the answer to that question. A page containing a paragraph starting with 'The corporate tax rate is 25%' in response to the question 'What is the corporate tax rate in Turkey?' is cited much more frequently than a long legal analysis page.
You can integrate this into your content production process as follows: For each important page, list three to five key questions that the page answers. Then, write the answers to these questions clearly within the page in a question-and-answer format. This creates a featured snippet opportunity for SEO and increases AI quotability from a GEO perspective.
Schema Markup: No Sourcing Without Structured Data
ChatGPT, Perplexity, and Gemini — all prefer processing structured data over parsing plain text. Schema markup in JSON-LD format tells AI systems what your content is in a machine-readable language. For an accounting firm, the trio of Organization + FAQPage + Article might be enough to be sourced in an AI response even once a month.
- Article schema: Be sure to use it in articles and blog posts. Fill the datePublished and dateModified fields with real dates.
- FAQPage schema: Use it on every page with a frequently asked questions section. It gets into Google's featured snippets and provides a direct answer format to AI systems.
- Organization schema: On the homepage and about us page. Ensure the organization name, logo, contact, and social media profiles are complete.
- HowTo schema: In content explaining step-by-step processes. AI systems prioritize pages containing HowTo data for 'how-to' questions.
Content Without Author Identity Is Untrustworthy
It is now known that trust evaluation is performed during ChatGPT's training data and real-time searches. It is observed that sites without author information, bearing vague signatures like 'Editorial Team', or with uncertain identity profiles appear late in AI sources. Adding a real biography page, photo, and, if possible, a LinkedIn profile link for each author strengthens this signal.
llms.txt: Direct AI Communication
Robots.txt tells search engines 'do not enter here'. Llms.txt, on the other hand, tells AI bots 'this is who I am, this is what I do'. Adding an llms.txt file to your site's root directory allows Perplexity and some Claude versions to categorize your site more accurately. As of 2025, less than 3% of sites in Turkey have this file — early action is a significant advantage.