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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
Symphony
A
Sora
A
Lovable
A
TaglineAI search done right. Cited answers, not chat theater.OpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.OpenAI's video model. Long clips, cinematic quality.Build a full app from a prompt. Stripe-ready.
CategoryResearchAgentsVideoDesign
PricingFree + $20/mo ProFree (open-source)Included with ChatGPT Plus/ProFree + $25-$100/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Engineering teams already using Linear + OpenAI Codex who want to stop babysitting agent sessions and instead let the issue tracker drive autonomous coding at scale.ChatGPT subscribers experimenting with cinematic shots.Non-devs + solopreneurs shipping MVPs.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Fully autonomous ticket-to-PR pipeline: every open Linear issue gets its own isolated Codex agent without manual supervision
  • Fault-tolerant Elixir/OTP architecture automatically restarts crashed agents and manages hundreds of concurrent runs
  • WORKFLOW.md keeps all orchestration policy version-controlled inside the repo, so agent behavior is reproducible and reviewable like code
  • Proven internal results: OpenAI reported a 500% increase in landed PRs on some teams within three weeks
  • Open spec encourages community re-implementations in any language, not just Elixir
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Generates full apps + DB + auth
  • Good for non-developers
  • Ships faster than hand-coding
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Currently only supports Linear as an issue tracker — GitHub Issues and Jira integrations are not yet official
  • Only OpenAI Codex is officially supported as the agent runtime; other model integrations are community-contributed and incomplete
  • Self-hosted, Elixir-dependent engineering preview with no built-in sandboxing — not suitable for untrusted or production environments out of the box
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Complexity ceiling
  • Can generate brittle code
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.Symphony is the most architecturally serious 'issue tracker as control plane' approach yet — 15K GitHub stars in weeks confirms the idea resonates — but it's still a rough, self-hosted engineering preview that demands Elixir chops and a Linear-only workflow. (Verdict pending Phi's full review.)A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier. The strongest 'no-code' AI builder right now. Great for founder MVPs.
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