This hands-on review evaluates OpenAI's GPT-5.4, described as the company's 'most honest and efficient model yet.' Testing covers performance across standard benchmarks and practical applications, with particular focus on claimed improvements in reasoning, coding capabilities, and native Computer Use functionality.
The review finds significant token efficiency gains, with GPT-5.4 requiring fewer tokens for equivalent tasks compared to previous versions. Reasoning depth shows measurable improvement on complex multi-step problems, while coding capabilities demonstrate enhanced accuracy and style consistency.
Native Computer Use functionality enables more sophisticated real-world task completion, though performance varies by task complexity. The review provides practical guidance on when to use GPT-5.4 versus specialized models and previous versions based on specific requirements.[citation:3]