GPT-3.5 Turbo vs GPT-4: What’s The Difference?

Post author: Adam VanBuskirk
Adam VanBuskirk
3/19/23 in

The GPT series of language models have been at the forefront of natural language processing (NLP) research, and have seen significant improvements with each subsequent release. The latest additions to this series are the GPT-3.5 Turbo and GPT-4 models, which promise to offer even more powerful and nuanced language processing capabilities. In this article, we will explore the main differences between these two models.

An Upgraded vs New Model

It is important to note that GPT-3.5 Turbo is an upgraded version of the GPT-3 model, whereas GPT-4 is an entirely new model. As such, GPT-3.5 Turbo builds upon the architecture and training data of its predecessor, while GPT-4 is a new design that incorporates additional improvements and advancements.

Size Matters

One of the main differences between the two models is their size. GPT-3.5 Turbo has a total of 154 billion parameters, while GPT-4 is expected to have way more parameters, possibly in the trillions. This increase in size allows the models to process and understand even more complex and nuanced language patterns, and to generate more accurate and meaningful responses to input.

So Does Training

Another key difference is the training data used to build these models. GPT-3.5 Turbo was trained on a massive corpus of text data that includes books, articles, and web pages from across the internet. This training data is heavily focused on English language content, and as a result, the model is best suited for processing and generating English language text.

In contrast, GPT-4 is expected to have a more diverse range of training data, incorporating additional languages and sources beyond just English. This means that the model will be able to process and generate text in multiple languages, and will have a better understanding of the nuances and subtleties of different languages and dialects.

Evolving Architectures

The architecture of the two models also differs significantly. While GPT-3.5 Turbo uses a transformer-based architecture, GPT-4 is expected to incorporate additional layers and components that allow for more nuanced and complex processing of language. For example, GPT-4 may include a hierarchical architecture that allows it to better understand the relationships between words and concepts, and to generate more sophisticated and nuanced responses to input.

The Ability To Niche Down

GPT-4 is also expected to incorporate more advanced techniques for fine-tuning and customizing the model to specific use cases. This means that users will be able to train the model on specific datasets and task-specific language patterns, allowing it to generate even more accurate and relevant responses to input.


Both GPT-3.5 Turbo and GPT-4 represent significant advancements in the field of natural language processing. While the GPT-3.5 Turbo builds upon the existing architecture and training data of its predecessor, the GPT-4 is an entirely new model that incorporates additional improvements and advancements. With its larger size, more diverse training data, and advanced architecture, GPT-4 promises to offer even more powerful and nuanced language processing capabilities than its predecessors.

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