Generative Pre-trained Transformers (GPTs) are a series of large language models developed by OpenAI. Each new generation has been a significant leap forward, making AI more powerful and accessible.
GPT-1
Released in 2018, GPT-1 was the first model to use the transformer architecture for language tasks. It was a major step away from traditional recurrent neural networks. With 117 million parameters, it demonstrated the ability to generate coherent text but had a limited understanding of context beyond a few sentences. It was primarily a research model and not widely used by the public.
GPT-2
Launched in 2019, GPT-2 was a massive scale-up of its predecessor, with 1.5 billion parameters. It was trained on a huge dataset of internet text, which gave it a remarkable ability to perform a variety of tasks without specific training. GPT-2 could generate thematically relevant text, summarize articles, and even translate languages. OpenAI initially chose not to release the full version of the model due to concerns about its potential for misuse, such as generating fake news.
GPT-3
GPT-3, released in 2020, was a revolutionary model with a staggering 175 billion parameters. This massive increase in scale allowed it to generate highly coherent, creative, and human-like text across a wide range of tasks. Unlike previous models, GPT-3 could perform "zero-shot" and "few-shot" learning, meaning it could complete a task with little to no specific fine-tuning. It became widely available through an API, which led to a boom in AI-powered applications.
GPT-4
Released in March 2023, GPT-4 was a significant improvement in reasoning and accuracy. It was also the first multimodal GPT model, meaning it could accept both text and image inputs. This allowed it to perform tasks like describing the humor in an image or answering questions from a diagram. GPT-4 was also more "steerable," giving users greater control over its tone and behavior. It passed a simulated bar exam in the top 10% of test-takers, a major leap in its reasoning abilities.
The Latest: GPT-5
GPT-5 is the latest in the series, launched on August 7, 2025. It is a powerful multimodal large language model that combines both reasoning capabilities and non-reasoning functionality under a single interface. Key improvements over GPT-4 include faster response times, better coding and writing skills, more accurate answers to health questions, and lower levels of "hallucination."
GPT-5 is designed to be a "router" system that can automatically decide which specialized model to use for a given task, whether it's a fast, high-throughput model or a deeper reasoning model. This makes the system more efficient and versatile. GPT-5 is also natively multimodal, meaning its visual and text capabilities were trained alongside each other, rather than added on later.
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