How do Large Language Models (LLMs) like ChatGPT actually work?

Large Language Models (LLMs) are AI systems trained on massive amounts of text data, from websites to books, to understand and generate language.

They use deep learning algorithms, specifically transformer architectures, to model the structure and meaning of language.

LLMs don't "know" facts in the way humans do. Instead, they predict the next word in a sequence using probabilities, based on the context of everything that came before it. This ability enables them to produce fluent and relevant responses across countless topics.

For a deeper look at the mechanics, check out our full blog post: How Large Language Models Work.

Last updated at  
September 29, 2025
Other FAQ
Does RankWit support multiple countries?
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Yes! RankWit includes unlimited country tracking across all plans at no additional cost.
You can monitor AI visibility for any market worldwide.

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What is a transformer model, and why is it important for LLMs?
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The transformer is the foundational architecture behind modern LLMs like GPT. Introduced in a groundbreaking 2017 research paper, transformers revolutionized natural language processing by allowing models to consider the entire context of a sentence at once, rather than just word-by-word sequences.

The key innovation is the attention mechanism, which helps the model decide which words in a sentence are most relevant to each other, essentially mimicking how humans pay attention to specific details in a conversation.

Transformers make it possible for LLMs to generate more coherent, context-aware, and accurate responses.

This is why they're at the heart of most state-of-the-art language models today.

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How can Rankwit help my business integrate with ChatGPT’s Agentic Commerce Protocol?
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At Rankwit, we specialize in helping merchants take advantage of OpenAI’s Agentic Commerce Protocol (ACP).
Our team manages the entire integration lifecycle, from mapping your product catalog to OpenAI’s structured feed specification, to building the checkout API endpoints and connecting secure payment providers like Stripe.

By partnering with Rankwit, your business can:

  • Launch AI-powered conversational shopping experiences inside ChatGPT.
  • Achieve full compliance with OpenAI and PCI DSS standards.
  • Gain an unfair competitive advantage by adopting this technology before it becomes mainstream.

We tailor solutions to both enterprise and custom e-commerce platforms, ensuring a scalable and future-ready architecture.

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How can I optimize for GEO?
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GEO requires a shift in strategy from traditional SEO. Instead of focusing solely on how search engines crawl and rank pages, Generative Engine Optimization (GEO) focuses on how Large Language Models (LLMs) like ChatGPT, Gemini, or Claude understand, retrieve, and reproduce information in their answers.

To make this easier to implement, we can apply the three classic pillars of SEO—Semantic, Technical, and Authority/Links—reinterpreted through the lens of GEO.

1. Semantic Optimization (Text & Content Layer)

This refers to the language, structure, and clarity of the content itself—what you write and how you write it.

🧠 GEO Tactics:

  • Conversational Clarity: Use natural, question-answer formats that match how users interact with LLMs.
  • RAG-Friendly Layouts: Structure content so that models using Retrieval-Augmented Generation can easily locate and summarize it.
  • Authoritative Tone: Avoid vague or overly promotional language—LLMs favor clear, factual statements.
  • Structured Headers: Use H2s and H3s to define sections. LLMs rely heavily on this hierarchy for context segmentation.

🔍 Compared to Traditional SEO:

  • Similarity: Both value clarity, keyword-rich subheadings, and topic coverage.
  • Difference: GEO prioritizes contextual relevance and direct answers over keyword stuffing or search volume targeting.

2. Technical Optimization

This pillar deals with how your content is coded, delivered, and accessed—not just by humans, but by AI models too.

⚙️ GEO Tactics:

  • Structured Data (Schema Markup): Clearly define entities and relationships so LLMs can understand context.
  • Crawlability & Load Time: Still important, especially when LLMs like ChatGPT or Perplexity use live browsing.
  • Model-Friendly Formats: Prefer clean HTML, markdown, or plaintext—avoid heavy JavaScript that can block content visibility.
  • Zero-Click Readiness: Craft summaries and paragraphs that can stand alone, knowing the user may never visit your site.

🔍 Compared to Traditional SEO:

  • Similarity: Both benefit from clean code, fast performance, and schema markup.
  • Difference: GEO focuses on how readable and usable your content is for AI, not just browsers.

3. Authority & Link Strategy

This refers to the signals of trust that tell a model—or a search engine—that your content is reliable.

🔗 GEO Tactics:

  • Credible Sources: Reference reliable, third-party data (.gov, .edu, research papers). LLMs often echo content from trusted domains.
  • Internal Linking: Connect related content pieces to help LLMs understand topic depth and relationships.
  • Brand Mentions: Even unlinked brand citations across the web may boost your perceived credibility in LLMs’ training and inference models.

🔍 Compared to Traditional SEO:

  • Similarity: Both reward strong domain reputation and high-quality references.
  • Difference: GEO may rely more on accuracy and perceived authority across training data than on backlink volume or anchor text.

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What are common mistakes in Generative Engine Optimization (GEO)?
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As businesses and content creators begin adapting to Generative Engine Optimization, it's crucial to recognize that strategies effective in traditional SEO don’t always translate to success with AI-driven search models like ChatGPT, Gemini, or Perplexity.

In fact, certain classic SEO practices can actually reduce your visibility in AI-generated answers.

In traditional SEO, the use of targeted keywords, often repeated strategically across headers, metadata, and body content, is a foundational tactic.
This approach helps search engine crawlers associate pages with specific queries, and has long been used to improve rankings on platforms like Google and Bing.

However, in the context of GEO, keyword stuffing and rigid repetition can backfire. indeed, Large Language Models (LLMs) are not keyword matchers, but they are pattern recognizers that prioritize natural, contextual, and semantically rich language.
When content is overly optimized and lacks a conversational or human tone, it becomes less appealing for AI models to cite or summarize.
Worse, it may signal to the model that the content is promotional or unnatural, leading to it being deprioritized in AI-generated responses.

ℹ️ Best Practice: Instead of focusing on exact-match keywords, create content that mirrors how real users ask questions. Use plain, fluent language and focus on fully answering likely user intents in a natural tone.

Moreover, while E-E-A-T (Experience, Expertise, Authority, Trustworthiness) has gained importance in SEO, it’s often still possible to rank SEO pages with minimal authority if technical and content signals are strong. This is less true in GEO.

LLMs are trained to surface and reference content that demonstrates a high degree of trustworthiness. They favor sources that reflect real-world experience, subject-matter expertise, and institutional authority. Content without clear authorship, lacking credentials, or failing to convey reliability may be ignored by LLMs, even if it’s optimized in other ways.

ℹ️ Best Practice: Build content that clearly communicates why your organization or author is credible. Include bios, cite credentials, and demonstrate hands-on knowledge. For health, finance, or scientific topics, link to institutional or peer-reviewed sources to reinforce authority.


In addition, in traditional SEO, especially in long-tail keyword spaces, some websites can rank with minimal sourcing or citations, particularly when competing against weak content. However, GEO demands higher factual rigor.
LLMs are designed to summarize and synthesize trusted data. They tend to skip over content that lacks citation, includes speculative claims, or refers to ambiguous sources.

Moreover, AI models have been trained on vast amounts of data from academic, journalistic, and institutional sources. This training impacts which sites and sources the models tend to favor when generating answers. Content without strong sourcing is less likely to be cited or retrieved via Retrieval-Augmented Generation (RAG) processes.

ℹ️ Best Practice: Always back your claims with authoritative, up-to-date sources. Link to original studies, well-known publications, or government and academic institutions. Inline citations and linked references increase your content’s reliability from an LLM’s perspective.

In short, while there is some overlap between SEO and GEO, optimizing for AI models requires a distinct strategy. The focus shifts from gaming algorithmic ranking systems to ensuring clarity, credibility, and accessibility for intelligent systems that mimic human understanding. To succeed in GEO, it's not enough to be visible to search engines—you must also be comprehensible, trustworthy, and useful to AI.

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What is AI Search Optimization and why is it important?
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AI Search Optimization refers to the practice of structuring, formatting, and presenting digital content to ensure it is surfaced by AI systems—particularly large language models (LLMs)—in response to user queries.Choosing a clear, unified name for this emerging field is crucial because it shapes professional standards, guides tool development, informs marketing strategies, and fosters a cohesive community of practice. Without a consistent term, the industry risks fragmentation and inefficiency, much like early digital marketing faced before "SEO" was widely adopted.

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How does WebMCP differ from traditional web scraping when AI agents interact with websites?
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While traditional scraping is fragile and prone to breaking when a website's design changes, WebMCP provides a reliable "handshake" between the site and the AI.

  • Direct Access: Agents call specific functions (tools) instead of searching for buttons in code.
  • Resilience: Site layout changes don't break the integration as long as the underlying WebMCP schema remains the same.
  • Efficiency: It significantly reduces the tokens and compute power needed for an AI to "understand" a page

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What is ChatGPT Shopping Research and how does it work?
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Shopping Research is a feature in ChatGPT that acts as a personalized shopping assistant.
Simply describe what you’re looking for, such as “a lightweight laptop for travel”, and ChatGPT gathers product details, reviews, specs, prices, and comparisons from the web.

You can refine the results by marking products as “Not interested” or “More like this”, helping ChatGPT understand your preferences.

At the end, you receive a custom buyer’s guide that explains the pros, cons, and trade-offs of each option, making your purchase process easier and more informed.

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What’s the difference between GEO and AEO?
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Generative Engine Optimization (GEO) and Answer Engine Optimization (AEO) are closely related strategies, but they serve different purposes in how content is discovered and used by AI technologies.

  • AEO is focused on helping your content become the direct answer to user queries in AI-powered answer engines like Google's SGE (Search Generative Experience), Bing, or voice assistants. It emphasizes clear formatting, Q&A structure, and schema markup so that AI systems can easily extract and present your content in snippets or spoken responses.
  • GEO, on the other hand, is a broader approach designed to ensure your content is used, synthesized, or cited by generative AI models like ChatGPT, Gemini, Claude, and Perplexity. It involves creating high-quality, authoritative content that large language models (LLMs) recognize as trustworthy and relevant. It may also include using metadata tools (like llms.txt) to guide how AI systems interpret and prioritize your content.
In short:
AEO helps you be the answer in AI search results. GEO helps you be the source that generative AI platforms trust and cite.

Together, these strategies are essential for maximizing visibility in an AI-first search landscape.

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What’s RAG (Retrieval-Augmented Generation), and why is it critical for GEO?
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RAG (Retrieval-Augmented Generation) is a cutting-edge AI technique that enhances traditional language models by integrating an external search or knowledge retrieval system. Instead of relying solely on pre-trained data, a RAG-enabled model can search a database or knowledge source in real time and use the results to generate more accurate, contextually relevant answers.

For GEO, this is a game changer.
GEO doesn't just respond with generic language—it retrieves fresh, relevant insights from your company’s knowledge base, documents, or external web content before generating its reply. This means:

  • More accurate and grounded answers
  • Up-to-date responses, even in dynamic environments
  • Context-aware replies tied to your data and terminology

By combining the strengths of generation and retrieval, RAG ensures GEO doesn't just sound smart—it is smart, aligned with your source of truth.

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