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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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Windsurf
A
OpenRouter
S
Cartesia
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.One API, every model. Pay-as-you-go, no subscriptions.Ultra-low-latency voice. Built for realtime agents.
Categorycodingdev platformvoice
PricingFree + $15/mo ProPay per token — model-dependentFree tier + usage-based API
Best forDevelopers who want Cursor-like power for less money.Developers experimenting across models. Apps that want fallback logic.Developers building voice agents, phone bots, interactive apps.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Smaller community
  • Model selection more limited
  • Slight markup over direct API
  • Some provider features not exposed
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for model-shopping. I use this for every prototype before committing.S-tier for realtime. If latency matters more than voice catalog, start here.
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