Claude Sonnet 4 vs GPT-4o for Long-Form Content Writing: Which AI Model Performs Better in 2025?
Claude Sonnet 4 vs GPT-4o for Long-Form Content Writing: Which AI Model Performs Better in 2025? In January 2025, a digital marketing agency ran a blind test with 50 professional writers. They gave each writer two 2,000-word articles—one generated by Claude Sonnet 4, the other by GPT-4o—on the same topic: “The Future of Renewable Energy Storage.” The writers were asked to pick which one they would publish under their own byline. The result? 34 chose the Claude Sonnet 4 piece. But when asked which one was more factually dense and better structured, 29 picked the GPT-4o output. ...