OpenAI dropped GPT-5.4 two days after GPT-5.3. xAI’s Grok 4.20 is still in beta. We ran both through real tasks to find out which one holds up.

March 9, 2026

OpenAI dropped GPT-5.4 two days after GPT-5.3. xAI’s Grok 4.20 is still in beta. We ran both through real tasks to find out which one holds up.





