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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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Symphony
A
Cline
A
Runway
S
ChatGPT Operator
B
TaglineOpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.Open-source VS Code agent. Reads + writes + runs.The pro's AI video tool. Gen-4 is the current bar.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsCodingVideoAgents
PricingFree (open-source)Free (open source) + your API costsFree + $15-$95/moIncluded with ChatGPT Pro $200/mo
Best forEngineering teams already using Linear + OpenAI Codex who want to stop babysitting agent sessions and instead let the issue tracker drive autonomous coding at scale.VS Code users who want agentic coding without changing IDEs.Marketing video, pitch decks, b-roll, creative shorts.Power users willing to pay $200/mo for a browser bot.
Strengths
  • 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
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • 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
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Expensive at scale
  • Still needs post-editing
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictSymphony 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. Best free agentic option in VS Code. Use with Claude for best results.S-tier. Market leader with reason. Start here for serious video.B-tier. Still early. Manus is more flexible for less money.
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