The Memory Illusion: Why Your LLM "Remembers" (And Why It Actually Doesn't)

If you use ChatGPT, Claude, Grok, Copilot, or Gemini daily, it feels like you're talking to a person. It remembers what you said three messages ago. It references the project details you shared yesterday. It feels like the model has a persistent brain that is learning about you. But it’s a lie. From an architectural standpoint, an LLM is the most "forgetful" piece of software you will ever use. Every time you hit "Send," the model starts at a blank slate. So, how does it maintain your chat histo