OpenAI dropped GPT‑5.4 this week, and the company said ChatGPT power users should notice improvements right away. The launch comes just days after the launch of GPT-5.3 Instant, a more conversational model geared toward everyday users.
OpenAI wrote that GPT-5.4 is the “most capable and efficient frontier model for professional work.” So, obviously, GPT-5.4 is designed for professionals and developers. The company also announced the launch of GPT-5.4 Thinking and GPT‑5.4 Pro, aimed at people who want peak performance.
Here are three improvements that OpenAI made.
Improved efficiency
OpenAI said that GPT-5.4 operates more efficiently than ever.
It wrote that it was the company’s “most token-efficient reasoning model yet, using significantly fewer tokens to solve problems when compared to GPT‑5.2, translating to reduced token usage and faster speeds.” Basically, that means GPT-5.4 can solve problems and deliver answers with fewer tokens.
Better at doing real-world tasks
OpenAI said that the new model was far more capable of completing real-world tasks related to knowledge work.
Wrote OpenAI: “On GDPval, which tests agents’ abilities to produce well-specified knowledge work across 44 occupations, GPT‑5.4 achieves a new state of the art, matching or exceeding industry professionals in 83.0% of comparisons, compared to 70.9% for GPT‑5.2.”
Mashable Light Speed
In other words, it’s capable of doing a lot of people’s jobs reasonably well.
Improved accuracy
OpenAI claimed that GPT-5.4 cut down on mistakes. Compared with GPT-5.2, OpenAI said the model is 33 percent less likely to make false claims and its claims were 18 percent less likely to contain any errors, according to OpenAI.
More flexible approach to thinking
Instead of simply giving GPT-5.4 a prompt and letting it do its thing, you can course-correct the model as it goes.
“In ChatGPT, GPT‑5.4 Thinking can now provide an upfront plan of its thinking, so you can adjust course mid-response while it’s working, and arrive at a final output that’s more closely aligned with what you need without additional turns.”
ChatGPT for Excel add-in
Enterprise customers can also use GPT-5.4 with a new OpenAI plugin, the ChatGPT for Excel add-in. per OpenAI, the latest models will be more capable of creating and analyzing spreadsheets.
How to try GPT-5.4
As per usual, the new model starts rolling out today. It will be available in ChatGPT, Codex, and via the API. For this release, you’ll need a paid ChatGPT subscription to use the new models, at least, for now.
You can read OpenAI’s full blog post about the launch at the company’s website.
Disclosure: Ziff Davis, Mashable’s parent company, in April 2025 filed a lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.
