What is a large language model, actually?
If you’ve used ChatGPT, Claude, or Gemini lately, you’ve probably noticed they feel different than they did a year or two ago. They don’t just spit out answers instantly anymore; they often pause to “think” for a few seconds before responding. We’ve moved past the era of simple chatbots and into the age of the “reasoner.”
But what is a Large Language Model (LLM) at its core, and why has the way they work changed so much in late 2025? To understand what’s happening inside those digital brains, we have to look at how they were built and how they are evolving into something much more powerful than a fancy autocomplete.
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