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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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Cursor
S
Symphony
A
Perplexity
S
Bolt.new (StackBlitz)
A
TaglineVS Code fork that made AI coding actually work.OpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.AI search done right. Cited answers, not chat theater.Prompt to deployed full-stack app in the browser.
CategoryCodingAgentsResearchCoding
PricingFree + $20/mo Pro + $40/mo BusinessFree (open-source)Free + $20/mo ProFree + $20-$200/mo
Best forDevelopers. Non-developers who want to ship working code.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.Replacing Google for any question where you want a cited answer in seconds.PMs, founders, non-devs shipping MVPs.
Strengths
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 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
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • 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
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictS-tier for coding. If you write code of any kind, this pays back the $20 in a day.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.)S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
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