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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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chat
research
coding
image
video
voice
meeting
design
productivity
audio
writing
agents
dev platform
data
marketing
education
GitHub Copilot
B
Windsurf
A
Cartesia
S
Runway
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Codeium's agentic IDE. Cascade agent + strong free tier.Ultra-low-latency voice. Built for realtime agents.The pro's AI video tool. Gen-4 is the current bar.
Categorycodingcodingvoicevideo
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $15/mo ProFree tier + usage-based APIFree + $15-$95/mo
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers who want Cursor-like power for less money.Developers building voice agents, phone bots, interactive apps.Marketing video, pitch decks, b-roll, creative shorts.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Smaller community
  • Model selection more limited
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Expensive at scale
  • Still needs post-editing
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for realtime. If latency matters more than voice catalog, start here.S-tier. Market leader with reason. Start here for serious video.
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