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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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Devin
A
Flux (Black Forest Labs)
A
Le Chat (Mistral)
B
NotebookLM
S
TaglineCognition Labs' autonomous coding engineer.Open weights + strong photorealism. The open-source answer.French alternative. Fast, European, privacy-focused.Google's research notebook. Turns your docs into a podcast.
CategoryAgentsImageChatbotsResearch
Pricing$500/moAPI + open weights (Schnell is Apache 2.0)Free + $15/mo ProFree
Best forEngineering teams offloading tickets. Ops/platform work.Developers + power users who want control and privacy.European users with data residency needs. Fans of open-weight models.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • European data residency
  • Very fast responses
  • Open-weight Mistral models available
  • Good French/European languages
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Harder to use than hosted tools
  • Needs infra
  • Smaller capability gap vs frontier models
  • Less polished UX
  • Google-only
  • Can be slow on large corpora
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. S-tier if you self-host. The reason open-source image gen matters.B-tier overall, A-tier if GDPR/data residency matters. Solid backup option.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
LinkOpen →Open →Open →Open →