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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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GitHub Copilot
B
Devin
A
Cartesia
S
Ollama
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Cognition Labs' autonomous coding engineer.Ultra-low-latency voice. Built for realtime agents.Run LLMs locally. One-line install, GUI optional.
Categorycodingagentsvoicedev platform
PricingFree (limited) + $10/mo Pro + $19/mo Business$500/moFree tier + usage-based APIFree + open source
Best forTeams with GitHub already. Devs who don't want to change IDEs.Engineering teams offloading tickets. Ops/platform work.Developers building voice agents, phone bots, interactive apps.Devs wanting offline/local LLMs for privacy or experimentation.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for realtime. If latency matters more than voice catalog, start here.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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