Compare AI tools

	Symphony A	OpenRouter S	Replicate S	Claude Code S
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.	One API, every model. Pay-as-you-go, no subscriptions.	Run any open-source AI model with an API call.	Anthropic's CLI agent. Opus-powered, operates on your repo directly.
Category	Agents	Dev Platform	Dev Platform	Coding
Pricing	Free (open-source)	Pay per token — model-dependent	Pay per second of compute	Part of Claude Pro/Max/Team plans
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.	Developers experimenting across models. Apps that want fallback logic.	Developers using open-source models (Flux, SDXL, Whisper, etc).	Developers who want an agent, not autocomplete. Large refactors, tests, docs.
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	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	Tens of thousands of models (image, video, audio, LLMs) One-line API for any model Cog framework for custom model deploy	Runs locally, edits your actual files Strong on large codebases with 1M context Great at multi-step 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	Slight markup over direct API Some provider features not exposed	Cold starts on less-popular models Pricing gets real at scale	Terminal-based — learning curve Can't be used without Claude subscription
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 model-shopping. I use this for every prototype before committing.	S-tier for open-source model APIs. The default in this space.	S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
Link	Open →	Open →	Open →	Open →