GPT refers to a family of large language models based on the Transformer architecture, trained to predict the next word.
GPT (Generative Pre-trained Transformer) is a family of language models popularised by OpenAI. The name sums up its principle: a generative Transformer pre-trained on huge text corpora.
Its training consists of predicting the next word in a sentence. Repeated at very large scale, this simple mechanism gives striking abilities to understand and write.
GPT is the model that powers ChatGPT; other families such as Claude or Gemini rest on similar principles.
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