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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Devin
A
Claude Code
S
Cartesia
S
Leonardo.ai
A
TaglineCognition Labs' autonomous coding engineer.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Ultra-low-latency voice. Built for realtime agents.Gamer + creator image gen with model fine-tuning built in.
CategoryAgentsCodingVoiceImage
Pricing$500/moPart of Claude Pro/Max/Team plansFree tier + usage-based APIFree + $12-$60/mo
Best forEngineering teams offloading tickets. Ops/platform work.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Developers building voice agents, phone bots, interactive apps.Indie game devs, illustrators, anyone training custom style models.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • General output behind Midjourney
  • Can be overwhelming
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for realtime. If latency matters more than voice catalog, start here.A-tier for creators training custom looks. B-tier for general use.
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