Key Innovations:
2018: GPT-1: Introduced unsupervised pre-training and supervised fine-tuning.
2019: GPT-2: Scaled up to 1.5B parameters and introduced zero-shot learning.
2020: GPT-3: Massive scale-up to 175B parameters with few-shot learning capabilities.
2023: GPT-4 & beyond: Focused on multimodal capabilities and large-scale agents.
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