Quick Answer
Grok has real-time X/Twitter data and fewer guardrails. ChatGPT has a larger ecosystem.
Detailed Answer
Grok excels at: real-time X/Twitter analysis, current events, witty personality, and topics other AIs decline. ChatGPT excels at: ecosystem (DALL-E, plugins, Copilot), Code Interpreter, and broader capabilities. Choose Grok for social media insights and edgier conversations. Choose ChatGPT for productivity and creative tools.
Find Your Own Answer
The best way to decide is to try them yourself. Council lets you compare multiple AI responses to the same question.