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App$$$Cheap: Roughly under $50, or under $15/month.

Grok

Chat assistant with live access to what people are posting on X

Answers in a chat window and can pull in current posts from X, which is where it parts company with assistants working from training data alone. Programmers keep it around as a second opinion when another model is stuck on a bug. Basic use is free, with paid tiers above that. Confident wrong answers happen here as often as anywhere else.

Who backs it

Sorted by strength of stance

  • Lex FridmanDoes it

    AI researcher · Lex Fridman Podcast

    Keeps Grok for hard debugging. When the other models cannot crack something, he says Grok 4 Heavy is the best at it.

    Source: Lex Fridman Podcast: State of AI in 2026 transcript
  • Naval RavikantDoes it

    Angel investor · AngelList and the Naval podcast

    Grok is the one he counts on for a straight answer, the least filtered of the frontier models by his description. Access to X makes it good on news, and he rates it on hard scientific and mathematical questions. He says all four leading models have a place in his work.

    Source: nav.al: A Return to Code

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App entry · notes paraphrased from cited sources, quoted excerpts copied from the transcript they link to. Not medical advice. Not affiliated with, endorsed by, or reviewed by anyone listed. How this works.