New Delhi, Aug. 8 -- Soon after the GPT-5 launch on Thursday, xAI CEO Elon Musk went on the offensive and stated that his company's Grok 4 Heavy model still outperformed the new model running ChatGPT. Musk who had unveiled the Grok series of models last month also claimed that Grok 4 Heavy was the "most intelligent model in the world".

"Bottom line though: Grok 4 Heavy was smarter 2 weeks ago than GPT5 is now and G4H is already a lot better," Musk wrote in a post on X (formerly Twitter).

The billionaire then also shared that Grok 4 Thinking model still ranked above GPT-5 High on the ARC-AGI 2 leadeboard - a benchmark designed to rigorously evaluate the abstract reasoning and problem solving capabilities of AI models.

Musk also proclaim...