Compare AI tools

	Symphony A	Perplexity S	Sora A	Hugging Face 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.	AI search done right. Cited answers, not chat theater.	OpenAI's video model. Long clips, cinematic quality.	The GitHub of AI. Models, datasets, spaces — all in one.
Category	Agents	Research	Video	Dev Platform
Pricing	Free (open-source)	Free + $20/mo Pro	Included with ChatGPT Plus/Pro	Free + $9-$20/mo + enterprise
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.	ChatGPT subscribers experimenting with cinematic shots.	Any ML/AI developer. Hobbyists exploring open models.
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	Up to 20-sec clips at 1080p Strong physics + scene composition Storyboard feature for longer narratives Remix existing videos	Largest open-source AI model hub Hosted inference via Spaces + Inference Endpoints Great community
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	Stricter content policy than competitors Hit-or-miss on complex motion Text-in-video still struggles	Overwhelming for beginners Hosted inference pricing 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.	A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.	S-tier infrastructure. The one platform every AI dev eventually uses.
Link	Open →	Open →	Open →	Open →