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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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DeepSeek
S
Claude Agent SDK
S
DALL-E 3
B
Cursor
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Anthropic's SDK for building your own agents on Claude.OpenAI's image model. Built into ChatGPT Plus.VS Code fork that made AI coding actually work.
CategoryChatbotsAgentsImageCoding
PricingFree web + ultra-cheap API (~$0.14/M input tokens)API usage + SDK is freeIncluded with ChatGPT Plus $20/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers building custom agents for their own company/product.ChatGPT Plus users who want images without paying extra.Developers. Non-developers who want to ship working code.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Developer-only
  • You build the UI
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for builders. The right primitives. What Kai is built on under the hood.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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