Compare AI tools

	Symphony A	DALL-E 3 B	Suno S	Writesonic 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.	OpenAI's image model. Built into ChatGPT Plus.	Prompt to full song with vocals, instruments, the works.	SEO-first AI writer. Optimized for ranking content.
Category	Agents	Image	Audio	Marketing
Pricing	Free (open-source)	Included with ChatGPT Plus $20/mo	Free + $10/mo + $30/mo	Free + $15-$99/mo
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.	ChatGPT Plus users who want images without paying extra.	Jingles, intros, demos, sketches, personal use.	Content marketers churning out SEO articles.
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	Excellent prompt understanding Built into ChatGPT — no extra subscription Good at composition + concepts	Real songs with real lyrics v4 is very good Quick turnaround	SEO built-in (Surfer integration) Article generator for long-form Chatsonic for research
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	Aesthetic ceiling below Midjourney + Ideogram Text rendering worse than Ideogram No fine control	Copyright gray zone Audio quality behind studio	Output quality behind Claude for polish SEO automation can produce generic content
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.)	B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.	S-tier in its category. The first AI music tool I'd actually listen to.	B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
Link	Open →	Open →	Open →	Open →