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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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Windsurf
A
Symphony
A
Aider
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.OpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.Terminal-based AI pair programmer. Git-aware, model-flexible.
CategoryCodingAgentsCoding
PricingFree + $15/mo ProFree (open-source)Free (open source) + whatever API you use
Best forDevelopers who want Cursor-like power for less money.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.Developers who want open-source tooling with full control.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • 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
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Smaller community
  • Model selection more limited
  • 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
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.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. The right answer if you want open-source + terminal-native + model-agnostic.
LinkOpen →Open →Open →