Basic AI Concepts

AI is a broad category of software that recognizes patterns and learns from data to produce useful outputs. It's already used throughout daily life, like rerouting in map apps, detecting fraudulent transactions at banks, or customer support chatbots, and within it are models trained to perform specific tasks.

At the core of conversational AI are large language models (LLMs). LLMs learn patterns of language from massive amounts of text to generate and transform sentences, predicting the expression most likely to come next in context rather than "understanding" facts the way humans do.

Models typically develop in two stages. First, in pre-training, they acquire basic capabilities such as summarizing, writing, translating, and explaining through vast amounts of text. Then, in post-training, instruction-following, tone adjustment, policy compliance, and safety are reinforced.

Research organizations like OpenAI provide models trained this way as products and APIs, so users can use tools like ChatGPT or Codex, and developers can integrate them into their own services. Since tone and responses can change when a model is updated, it's important to clearly state the goal, audience, format, and constraints in order to get the desired result.

When choosing a model, balancing speed and depth is key.

• Non-reasoning models (or Instant) are tuned for fast, fluent output, making them suitable for drafting, summarizing, polishing sentences, and generating ideas.
• Reasoning models (or Thinking) are better suited for multi-step planning, complex analysis, tricky debugging, and decision-making with many constraints.
• It's recommended to initially rely on Auto in the basic ChatGPT experience, then switch to Thinking for more complex or high-stakes tasks.

In summary, AI is the broad field, models are the trained systems within it, LLMs are models specialized for language, and ChatGPT is the product that makes those models easy to use. Understanding this structure lets you focus afterward on how to write prompts to get the results you want.