According to Andrej Karpathy on Twitter, many users remain unaware that ChatGPT's o3 model is currently the superior option for complex reasoning and professional applications compared to the newer 4o model. Karpathy emphasizes that o3 delivers significantly better performance on important or difficult tasks, making it the preferred choice for enterprise and advanced use cases where accuracy and logical reasoning are critical (source: @karpathy, June 2, 2025). Businesses leveraging ChatGPT for professional workflows should prioritize o3 to maximize outcomes and reliability.