GPT-2 may be older but is perfectly relevant, being the granddaddy of modern LLMs (large language models ... just how GPT (generative pre-trained transformer) models work.
GPT-4 is the latest generation language model, GPT-4o being the latest specific version, created by OpenAI. It advances the technology used by ChatGPT, which was previously based on GPT-3.5 but ...
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