Elon Musk says Grok 4 is still smarter than GPT-5, vows Grok 5 will 'crush' competition

After the GPT-5 launch, xAI CEO Elon Musk claimed his Grok 4 Heavy model outperformed it, asserting it was the smartest model. He announced Grok's updates and teased Grok 5's release before year-end, while OpenAI highlighted GPT-5's advancements in various fields.