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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Devin
A
Claude Agent SDK
S
ChatGPT Operator
B
Groq
S
TaglineCognition Labs' autonomous coding engineer.Anthropic's SDK for building your own agents on Claude.OpenAI's browser agent. Clicks and types on websites for you.The fastest AI inference in the world. Crazy low latency.
CategoryAgentsAgentsAgentsDev Platform
Pricing$500/moAPI usage + SDK is freeIncluded with ChatGPT Pro $200/moFree tier + pay-as-you-go API
Best forEngineering teams offloading tickets. Ops/platform work.Developers building custom agents for their own company/product.Power users willing to pay $200/mo for a browser bot.Developers who need sub-100ms LLM responses.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Developer-only
  • You build the UI
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for builders. The right primitives. What Kai is built on under the hood.B-tier. Still early. Manus is more flexible for less money.S-tier for speed. When latency is the product, start here.
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