Compare AI tools

	Symphony A	Perplexity S	Ollama S	GitHub Copilot B
Tagline	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.	Run LLMs locally. One-line install, GUI optional.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.
Category	Agents	Research	Dev Platform	Coding
Pricing	Free (open-source)	Free + $20/mo Pro	Free + open source	Free (limited) + $10/mo Pro + $19/mo Business
Best for	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.	Devs wanting offline/local LLMs for privacy or experimentation.	Teams with GitHub already. Devs who don't want to change IDEs.
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	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Run Llama, Mistral, Qwen, etc. on your laptop Simple CLI + API Hardware-aware (picks the right quant)	Great enterprise story Works in your existing IDE Chat + autocomplete
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	Not a general chatbot Answers can be shallow on complex topics	Needs beefy laptop for larger models Speed way behind cloud APIs	Less agentic than Cursor/Claude Code Model quality varies
Kai's verdict	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.	S-tier for local inference. If you care about privacy or want to tinker, install this today.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.
Link	Open →	Open →	Open →	Open →