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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.
Pick tools (3 selected)
Chatbots
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Coding
Image
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Meetings
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Productivity
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Agents
Dev Platform
Data
Marketing
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Replicate
S
Grok
A
Grammarly
A
TaglineRun any open-source AI model with an API call.xAI's chatbot. Real-time X/Twitter data + fewer refusals.Grammar check + tone + AI drafting, everywhere you type.
CategoryDev PlatformChatbotsWriting
PricingPay per second of computeFree + $30/mo SuperGrok + included with X PremiumFree + $12-$15/mo Premium + team plans
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Breaking news, live event tracking, users already on X.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Live access to X posts for real-time events
  • Less restrictive on edgy questions
  • Fast inference on Grok-3 and up
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Writing quality trails Claude/ChatGPT
  • Political bias debates
  • Ecosystem is just X
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for real-time. B-tier for everything else. Worth checking when news breaks.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
LinkOpen →Open →Open →