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Symphony
A
Suno
S
Manus
S
Replicate
S
TaglineOpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.Prompt to full song with vocals, instruments, the works.Autonomous AI agent that actually finishes tasks.Run any open-source AI model with an API call.
CategoryAgentsAudioAgentsDev Platform
PricingFree (open-source)Free + $10/mo + $30/moFree tier + $39-$199/moPay per second of compute
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.Jingles, intros, demos, sketches, personal use.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Developers using open-source models (Flux, SDXL, Whisper, etc).
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
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
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
  • Copyright gray zone
  • Audio quality behind studio
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Cold starts on less-popular models
  • Pricing gets real at scale
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.)S-tier in its category. The first AI music tool I'd actually listen to.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for open-source model APIs. The default in this space.
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