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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Grammarly
A
Groq
S
Perplexity
S
ChatGPT Operator
B
TaglineGrammar check + tone + AI drafting, everywhere you type.The fastest AI inference in the world. Crazy low latency.AI search done right. Cited answers, not chat theater.OpenAI's browser agent. Clicks and types on websites for you.
CategoryWritingDev PlatformResearchAgents
PricingFree + $12-$15/mo Premium + team plansFree tier + pay-as-you-go APIFree + $20/mo ProIncluded with ChatGPT Pro $200/mo
Best forNon-native English writers, business email, anyone who types a lot.Developers who need sub-100ms LLM responses.Replacing Google for any question where you want a cited answer in seconds.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for speed. When latency is the product, start here.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Still early. Manus is more flexible for less money.
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