Grok 4.1 Fast vs ChatGPT 5.2 Instant: Speed, Latency, and Everyday Assistant Performance Grok 4.1 Fast and ChatGPT 5.2 Instant target the same moment in daily work: rapid, repeated interactions where responsiveness matters more than depth. Both are designed to be used dozens of times per day. They differ in how they define what “everyday performance” should feel like. ····· Grok 4.1 Fast prioritizes presence, relevance, and conversational flow. Grok 4.1 Fast is tuned to feel