Peter Yang compares ChatGPT, Claude, Grok, and Gemini head-to-head with live demos across 10 use cases (August 2026). ~27 minutes.

The winners by category

  • Design → Claude — Claude Design asks clarifying questions first (none of the others do) and Fable 5 produces real product-launch videos via the free Hyper Frames skill; Grok’s app prototypes were the most visually impressive (layout + image gen), Gemini had alignment issues; watch out for the “Claude beige” default look
  • Everyday answers / personality → ChatGPT — Claude’s personality peaked at Opus 4.6; Opus 5 is judgmental and full of Claude-speak; ChatGPT dropped its “if you want, I can also…” quirk
  • Writing / editing → ChatGPT — Claude’s writing “devolved” into Claudisms (“this is X not Y”); ChatGPT sticks to his style with a newsletter skill + the no-AI-slop skill (5,000+ GitHub stars)
  • Planning → Claude Fable — still “the smartest and wisest model in the market”; it caught “close the video ops gap this week” that ChatGPT missed
  • Coding → ChatGPT — browser use and long-running conversations; caveat: his L8-engineer friend Kun says GPT-4-so and Opus over-engineer, and prefers Grok for surgical changes (“not 500,000-line changes”)
  • Browser / computer use → ChatGPT — an OpenAI employee prepped a whole immigration package (7 years of taxes, bank statements) in minutes; forms, government sites, even corporate training videos
  • Voice chat → ChatGPT by far — a live voice thread that orchestrates other threads and agents
  • Image gen → ChatGPT — followed his brand guidelines for infographics; Gemini’s Nano Banana is comparable with the right prompt
  • Video gen → Gemini — crazy Japanese commercials; Grok’s version was “pretty damn scary”; Chinese tools like SeaArt have no restrictions
  • Personal agents → ChatGPT — the harness race is less about the model than the tool; Grok Bot has the cleanest UX but is too restrictive (one thread per agent); Gemini’s Spark is interesting but short on plugins

Overall

  • ChatGPT is the clear winner — $20/mo gets you most of it; Claude for design and planning, Gemini for video, Grok as the up-and-coming agent contender
  • Custom-instruction tip: “be candid, tell me what I need to hear, active voice, no AI slop words (delve, foster, leverage…)”
  • “Whoever wins the personal agent race will capture the lion’s share of consumer attention of AI”

“The personal agent race is actually less about the model and more about the harness or the tool.”