GPT-5.4 review: our verdict on OpenAI’s professional model

Quick summary:GPT-5.4is mainly built for long, dense, demanding work. Where a lighter model starts to lose steam, it stays on course longer and performs better. A major new release from OpenAI. With GPT-5.4, the US company wants to go further in serious professional workflows, where lighter models still start to show their limits. On paper, everything is there: more context, more stamina, more ambition. But behind the polished messaging, one question remains: is this really the model to pick today? Yes, GPT-5.4 makes sense if you have real requirements behind it. Not for writing three emails and rephrasing two sentences, but for handling large subjects, endless docs, dense analyses, or deliverables where context retention truly changes the outcome. Here is a small decision table to help you choose. The tool fromOpenAIstands out for its ability to stay on track. Older models often lost the thread of instructions. Now, the system follows your directions closely. At the same time, a 33% drop in factual errors has been reported. For jobs that demand rigor, that matters.

Key Features

• Sharp drop in factual errors (-33 %)
• Autonomous control of the computer and external software
• ‘Thinking’ mode with edits possible in the middle of the logic flow
• Very large context window, up to 1,050,000 tokens
• Limited value for simple tasks or occasional use
• May run slower or cost more on heavy tasks, depending on the mode
• Clearly aimed at professional work rather than everyday use
• Ideal for:Developers and analysts who handle complex data.
• Less suited if:You only want to draft basic emails.
• Key factor:The ability to correct the AI while it reasons.