Need a break? Play the USA TODAY Daily Crossword Puzzle. On the Grok 4 livestream, Musk said the most important thing for AI to be is “maximally truth seeking.” Musk also said AI systems should be optimized “to be maximally truth seeking” and encouraged “to be truthful, honorable, good things, like the values you want to instill in a child that would ultimately grow up to be incredibly powerful.” What is Grok 4? Grok 4 is the latest version of the large language model. xAI launched two versions of the model on Wednesday: Grok 4 and the more powerful Grok 4 Heavy. Users can access Grok 4 for $30 a month. Grok 4 Heavy costs $300 a month. Grok 2 debuted last August. Grok 3, which was released in February, is available for free. What is Grok? Musk, the world’s richest man, founded xAI in 2023 as a challenger to Microsoft-backed OpenAI and Alphabet's Google. He had long been interested in AI and co-founded OpenAI, the ChatGPT maker, in 2015 as a nonprofit research organization. He cut ties in 2018 and has repeatedly clashed with the organization. After ChatGPT captured the public imagination, with millions marveling at its ability to sound like a real person while replying conversationally to complicated questions, Musk complained that chatbots reeked of liberal bias on issues like diversity and transgender rights. He said part of his motivation to start a rival AI company was to fight “woke” AI. “Grok is designed to answer questions with a bit of wit and has a rebellious streak,” xAI said when it released the chatbot.