ChatGPT’s Models Explained: Which GPT to Use and When?

As the world’s most popular generative AI tool with over 5 billion monthly visits, ChatGPT has become an indispensable assistant for many of us. However, since both artificial intelligence and these types of tools are still relatively new, many users aren’t taking full advantage of ChatGPT’s capabilities. In this article, we’ll cover a crucial aspect you need to know to get the most out of ChatGPT.

Users with a paid ChatGPT subscription can switch between different models, while free users sometimes notice the model changing automatically. At the time of writing, there are several distinct GPT models available to Plus subscribers. So, what do these models do? And in which scenarios is it best to use a specific model? We’ll answer these questions now, based on official information from OpenAI.

If you subscribe to ChatGPT Plus or Pro today, you can use models like GPT-4o, GPT-4, and various optimized versions. Let’s take a closer look at what these models are for and when you should use each one.

Let’s start with GPT-4o

GPT-4o is OpenAI’s flagship and most powerful large language model. Capable of handling your daily needs with ease, this model can process voice, image, and text. It is also the default model activated for free users, although, as you might expect, certain limitations apply.

GPT-4 (Described as GPT-o3 in the source)

This model represents OpenAI’s most advanced model for complex reasoning. It is ideal for multifaceted tasks that require deep analysis and where answers are not immediately obvious. According to OpenAI’s official description, it should be used for relatively complicated tasks such as coding, mathematics, science, and visual analysis. With its strong analytical capabilities, the model excels in fields like biology, math, and engineering.

Optimized Models: GPT-4 mini & GPT-4 mini-high (Described as GPT-o4-mini/high in the source)

The GPT-4 mini and GPT-4 mini-high models also possess strong reasoning abilities, similar to the main GPT-4 model. However, these versions are highly optimized, which increases speed and reduces costs. Users should think of GPT-4 mini as a faster version of the standard reasoning model. GPT-4 mini-high is specifically recommended for reasoning tasks in coding and visual analysis.

GPT-4.1

The GPT-4.1 model is specially optimized by OpenAI for coding. Known for its high speed in programming tasks, GPT-4.1 can be considered an alternative to the other reasoning models. It excels at following instructions and delivers superior performance in web development tasks. For non-coding purposes, this model may not be necessary.

GPT-4.1-mini

GPT-4.1-mini can be thought of as a backup version of GPT-4o. As a slightly more optimized model, GPT-4.1-mini automatically activates when the usage limit for GPT-4o is reached. It is suitable for both coding and general tasks.

GPT-4.5

GPT-4.5 is OpenAI’s newest and most advanced large language model, though it is still in its early stages. Offered as a “research preview” to ChatGPT Plus and ChatGPT Pro subscribers, this model is notable for its emotional intelligence. Since OpenAI is still monitoring its performance, it’s difficult to define its exact area of expertise. However, OpenAI suggests it is better for creative writing and exploring ideas.

Which Model is Available on Which Plan?

The table above shows which OpenAI model is available on each ChatGPT plan. However, there’s an important detail: even on “unlimited” plans, OpenAI may apply restrictions after a certain point. The company states that usage must remain at a “reasonable” level and comply with OpenAI’s policies.

So, which model do you prefer when using ChatGPT? Have you been able to notice the differences between them? Feel free to share your thoughts with us.