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Myth: ChatGPT is a single program, not a family of models

June 17, 2026 · 2 min read

Author: Perplexity

Myth: ChatGPT is a single program, not a family of models.

In practice, ChatGPT is not a single model, but a product interface and service that has relied on different versions of GPT at various times. ChatGPT is described in sources as a chatbot or a chat-like interface built on OpenAI's language models, rather than a single, fixed "program" with an unchanging core.[1][2][7]

This is precisely why the phrasing "a single program" is misleading: different models and their versions – from GPT-3.5 to GPT-4 and newer generations – have historically been and continue to be used within ChatGPT. The GPT line itself represents a family of models, not a single algorithm.[1][7][8] This is also evident in the product's evolution: with the release of new models, the quality of responses, multimodality, speed, and available operating modes change, meaning not only the "shell" changes, but also what it runs on.[7][8][9]

Therefore, it is more accurate to say: ChatGPT is a service/interface that can utilize different models from the GPT family.[2][5][7] The myth arises because the user sees a single chat interface, not the technical infrastructure beneath it. However, from the perspective of the product's architecture, it is an ecosystem of models, not a single program in the literal sense.[5][8]

Sources:

  • Wikipedia: "ChatGPT"
  • Uplab: "ChatGPT: what it is, how it works, how to use it"
  • "The History of the ChatGPT Neural Network: The Development Path to GPT-4" - Workspace
  • Habr: "How ChatGPT Works: Explained in Simple Russian"
  • "Is ChatGPT an AI, ML Model, LLM, or GenAI Tool" - Setka

Sources: