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OpenAI is now bringing GPT-4.1 to the Plus, Pro, and Team tiers of ChatGPT. GPT-4.1 was previously available only to API users. Since I'm throwing a whole lot of buzzwords at you, let's spend a minute deconstructing all these terms.
- GPT-4.1 is a large language model (LLM). It's the actual code that is the AI. Think of it as an engine in your car. A more powerful engine might have more vroom, but even a less powerful engine will move the car. Each of the GPT versions refers to AI models with more or less power.
- ChatGPT is the chat interface. It's the software that takes in your prompts, sends them to the large language model, and shows you the results. In our analogy, ChatGPT is the car, with GPT-4.1 (or GPT-4o, or GPT-3.5) being the engine.
- API (or application programming interface) is the way programs communicate with other programs. In the case of GPTs, it's how programs by many companies can call on an LLM to get results. A very rough analogy is the wiring harness between a car's dashboard and its engine.
- OpenAI is the company that makes the GPT and the chatbot. It's like Ford. Ford makes cars, but it also sells very fast crate engines to other companies, which incorporate those engines into customized vehicles. Likewise, OpenAI makes ChatGPT, but it also licenses its large language models to any developer who wants AI without writing it from scratch.
OK, so that should bring you up to speed. Back in April, OpenAI released GPT-4.1 for developers to use via the API. That's roughly the equivalent of Ford coming out with a new engine but selling it only to mechanics to put in custom cars.
Now OpenAI is releasing GPT-4.1 for use in ChatGPT. This is basically like Ford selling the engine to car buyers as an upgrade option when they pick up their new Mustang.
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Plus, Pro, and Team tiers are the for-pay versions of ChatGPT, usually with better features or more usage capabilities than the free version. Sadly, I don't have a really good car analogy here, except to say that (and this is a stretch) it's like offering a car feature only to fleet buyers.
Understanding GPT versions
An easy answer is that GPT-4.1 is the new, better version of GPT that exceeds the performance of the more mainstream GPT-4o.
Give me a minute here. It's time to hurt your brain. Hey, my brain hurts, so I might as well share the joy.
There was once GPT-1 and then GPT-2. That made sense. But since then, OpenAI has released GPTs called GPT-3.5, GPT-3.5 Turbo, GPT-4 Turbo, GPT-4o, GPT-4o Mini, o1, o1-mini (with a dash, lower case "m"), o1 pro (no dash), o3-mini, o3-mini-high, GPT-4.5, GPT-4.1 (which is newer than GPT-4.5, because, go figure), o3, o4-mini, o4-mini-high, and, well, isn't that enough?
I mean, seriously, OpenAI. What the living heck-bomb are you thinking?
Don't try to understand where one GPT fits compared to another by its version number. There is some internal method to the madness, but thinking about it will hurt and yield you no useful information. In practice, there are big differences in terms of how much compute power is used and how big a problem they can solve, but those nuances are mostly of concern to programmers who are paying OpenAI based on their usage.
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For chat users, I've found it's just easier to recommend you think of each like a car model name, each with its own characteristics.
Today, we're going to mostly talk about two models, GPT-4o and GPT-4.1. GPT-4o is the fully multimodal (text, images, audio as input and output) version of GPT that has been in mainstream use by paying ChatGPT customers for about a year. Free-tier users are also using GPT-4o but with restrictions (free users can't ask ChatGPT to generate images, for example).
But what is GPT-4.1?
The big news is that GPT-4.1 is better at tasks related to software development. I haven't had a chance to test that hands-on, but I'll share with you some of OpenAI's test results and some anecdotal reports by API users who moved from GPT-4o to GPT-4.1.
OpenAI does a series of tests to benchmark accuracy in a variety of areas, including coding, instruction following, and long context.
Source: OpenAI
Coding is pretty self-explanatory.
Instruction following means how well the AI follows instructions. For example, my Yorkie-Poo pup has an instruction-following rating of something under 1% (unless there's a treat in evidence). GPT-4.1 scored a 38.3% rating -- which, at less than half the time, isn't that much more than my dog. That's something to keep in mind when relying on an AI.
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Long context implies the size of the challenge. This judges how well an AI can look at large problems, across a variety of media types, and render a result.
In all cases, a higher number is better. GPT-4.1 has higher numbers than GPT-4o.
OpenAI shared some statements about GPT-4.1 accuracy from programmers using the LLM's API.
Parul Pandey says, "GPT-4.1 reads fewer unnecessary files, writes fewer junk changes, and doesn't blabber as much." I'm all for reduced blabber!
Phil Franco says, "Just tried the 1M context on GPT-4.1 with my entire project codebase. Found bugs I didn't know existed and suggested architecture improvements that would've taken weeks to figure out."
Karen Puah says, "GPT-4.1 is more obedient, better at staying on task, great with tools and long-form input, and capable of autonomously solving problems with the right instructions. If you're working on a custom GPT, autonomous agent, code assistant, or enterprise chatbot, this upgrade is gold."
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The bottom line for GPT-4.1 seems to be more of the same, but better. Given that the improved offering now comes baked into all of the ChatGPT pay versions -- for those who are contributing to OpenAI's $415 million monthly revenue stream -- better is better.
Have you had a chance to explore GPT-4.1 yet? How do you think it compares to GPT-4o in your own use cases? If you're doing software development or using custom GPTs, do you see meaningful improvements? Do you think the added accuracy and task focus are worth upgrading to a paid tier? Let us know in the comments below.
You can follow my day-to-day project updates on social media. Be sure to subscribe to my weekly update newsletter, and follow me on Twitter/X at @DavidGewirtz, on Facebook at Facebook.com/DavidGewirtz, on Instagram at Instagram.com/DavidGewirtz, on Bluesky at @DavidGewirtz.com, and on YouTube at YouTube.com/DavidGewirtzTV.
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