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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
Cartesia
S
Sora
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Ultra-low-latency voice. Built for realtime agents.OpenAI's video model. Long clips, cinematic quality.
Categorycodingvoicevideo
PricingFree + $15/mo ProFree tier + usage-based APIIncluded with ChatGPT Plus/Pro
Best forDevelopers who want Cursor-like power for less money.Developers building voice agents, phone bots, interactive apps.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • 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
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Smaller community
  • Model selection more limited
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for realtime. If latency matters more than voice catalog, start here.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
LinkOpen →Open →Open →