Symphony42 sits above the frontier models, voice runtimes, telephony, ad platforms, and systems of record — META orchestration. Each layer is a champion we test challengers against on conversion and economics, so every improvement in the ecosystem improves our agents without a rebuild. Below is the stack our agents run on today.
AI models and runtimes
OpenAI — realtime speech models
Retell AI — voice runtime
HeyGen — LiveAvatar
ElevenLabs
Anthropic Claude
Google Gemini
xAI Grok
Production calls run on OpenAI realtime models through Retell. Claude, Gemini, and Grok serve as adversarial reviewers of every prompt, spec, and release in Symphony42 OS.
Telephony and infrastructure
Twilio
Microsoft Azure
PostgreSQL
Redis
Replit
Cloudflare
GitHub
Traffic
Google Ads
OpenAI Ads (ChatGPT)
Meta Ads
Ringba / RingbaX
Fluent
LiveIntent
TikTok
X Ads