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01 ·Model Families·★ MEMBER·9 min read The GPT Lineage — Design Thinking from GPT-1 to Today A generation-by-generation walk from GPT-1 to GPT-4o and the reasoning models, asking what changed and what deliberately did not. At the centre sits one machine that only ever predicts the next token; what moved was scale, the order of training, and how the output was disciplined.