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S
Bolt.new (StackBlitz)
A
Groq
S
ChatGPT Operator
B
TaglineRun any open-source AI model with an API call.Prompt to deployed full-stack app in the browser.The fastest AI inference in the world. Crazy low latency.OpenAI's browser agent. Clicks and types on websites for you.
CategoryDev PlatformCodingDev PlatformAgents
PricingPay per second of computeFree + $20-$200/moFree tier + pay-as-you-go APIIncluded with ChatGPT Pro $200/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).PMs, founders, non-devs shipping MVPs.Developers who need sub-100ms LLM responses.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Best for fast prototypes. Competitive with Lovable — try both.S-tier for speed. When latency is the product, start here.B-tier. Still early. Manus is more flexible for less money.
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