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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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S
GitHub Copilot
B
Genspark
A
Devin
A
TaglineRun any open-source AI model with an API call.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI agent for deep search. Generates Sparkpages — full mini-reports.Cognition Labs' autonomous coding engineer.
Categorydev platformcodingresearchagents
PricingPay per second of computeFree (limited) + $10/mo Pro + $19/mo BusinessFree + $25/mo Plus$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Teams with GitHub already. Devs who don't want to change IDEs.Travel planning, shopping comparisons, deep research where you want an artifact back.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Sparkpages = curated multi-source mini-articles
  • Agent can book, compare, shop
  • Autopilot agent for long tasks
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Early-stage — rough edges
  • Less reliable than Perplexity for simple questions
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Bet on this one — the Sparkpage format is genuinely new.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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