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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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Replicate
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Groq
S
Claude Agent SDK
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Fathom
S
TaglineRun any open-source AI model with an API call.The fastest AI inference in the world. Crazy low latency.Anthropic's SDK for building your own agents on Claude.Meeting notes, free forever for individuals.
CategoryDev PlatformDev PlatformAgentsMeetings
PricingPay per second of computeFree tier + pay-as-you-go APIAPI usage + SDK is freeFree for individuals + $15-$29/user/mo teams
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers who need sub-100ms LLM responses.Developers building custom agents for their own company/product.Solo operators, freelancers, small teams on a budget.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Developer-only
  • You build the UI
  • Bot-joining model
  • Team features gated
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for speed. When latency is the product, start here.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for solo + free. The best free option, hands down.
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