GPT-5.4 is a strong professional assistant with native computer-use chops and efficient workplace drafting. Our tests show solid helpfulness, empathy, and instruction following for everyday work. Creative writing is competent but already showing the reasoning-era pattern: prose that gets the job done without the nuance and voice people still miss from GPT-4.5. A reliable mid-2026 workhorse—better at finishing tasks than at sounding like a novelist.