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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
Manus
S
Runway
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Autonomous AI agent that actually finishes tasks.The pro's AI video tool. Gen-4 is the current bar.
Categorycodingagentsvideo
PricingFree + $15/mo ProFree tier + $39-$199/moFree + $15-$95/mo
Best forDevelopers who want Cursor-like power for less money.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Marketing video, pitch decks, b-roll, creative shorts.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Smaller community
  • Model selection more limited
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Expensive at scale
  • Still needs post-editing
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier. Market leader with reason. Start here for serious video.
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