Dev.to
7/14/2026

The original title is "What Is GPT? A Practical Guide to Tokens, Transformers, Training, and Fine-Tuning"
Original: What Is GPT? A Practical Guide to Tokens, Transformers, Training, and Fine-Tuning
Short summary
A beginner-friendly guide explaining what GPT stands for and how it works under the hood. Covers tokenization (BPE), the Transformer architecture from the 2017 'Attention Is All You Need' paper, pre-training via next-token prediction, and the distinction between pre-training and fine-tuning. Standard educational content with no novel insights.
- •Explains GPT as Generative Pre-trained Transformer with tokenization, embeddings, and next-token prediction
- •Covers Transformer architecture origins and BPE subword tokenization
- •Provides entry-level overview of pre-training vs fine-tuning with basic math notation
Generated with AI, which can make mistakes.
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