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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
Cline
A
Ollama
S
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.Open-source VS Code agent. Reads + writes + runs.Run LLMs locally. One-line install, GUI optional.
CategoryCodingAgentsCodingDev Platform
PricingFree + $20/mo Pro + $40/mo BusinessFree (open-source)Free (open source) + your API costsFree + open source
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.VS Code users who want agentic coding without changing IDEs.Devs wanting offline/local LLMs for privacy or experimentation.
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
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
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
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
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.)A-tier. Best free agentic option in VS Code. Use with Claude for best results.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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