AI Tools xAI's Grok vs ChatGPT vs Claude vs Gemini vs DeepSeek: A Marketer's Real Pick for Each Marketing Job Five frontier models, five different superpowers. After running them side by side on real campaigns for six months, here's which one I open for which marketing job — and the brand-safety landmine that makes Grok-Imagine unusable for most brands. 06/15/2026