AI phone agents with integrated audio understanding, model routing, and voice optimization
Stage
Not given
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Founded
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Based in
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US
Pricing model
Paid
Paid
Pricing
Not given
Cost-plus pricing: customers pay vendor list prices for models and voice plus hosting (15% of vendor costs, 0.5¢ to 2¢ per minute) plus company margin (17-25%). Lean calls cost from 2.0¢/min (1.18¢ vendors + 0.50¢ hosting + 0.35¢ margin). Receptionist calls cost 4.7¢/min (3.36¢ vendors + 0.50¢ hosti
Key features
Listens while it speaks
Reasons over speech, not text
Replies in 350 ms
Mirrors prospect's tone and pace
Runs discovery instead of reading scripts
Handles objections
Runs in your own cloud VPC
Inspect every turn in text and audio
Improves over time through fine-tuning
Define workflow, tools and personality
Multi-model architecture running multiple transcription and language models per call
Zeus AI agent that builds, tests and tunes voice agents automatically
Simulated call testing before live deployment
Live call monitoring and observability
A/B testing and automated fix suggestions
Integration wizard for CRM, VoIP and business software
Client portals for managing multiple agents
Knowledge base integration for agent grounding
Outbound campaigns with CSV upload and scheduling
What makes it different
Duplex architecture listens and speaks simultaneously, not turn-based
Handles interruptions and background noise naturally
Trained on top-performing sales reps' calls
Runs end-to-end in your cloud environment
Cost-plus pricing with no margin markup pass-through when vendor prices drop
Fully agentic Zeus AI that handles entire lifecycle from creation to optimization
Multi-model architecture for superior audio understanding vs 3-step pipelines
Starts at 2¢/min, cheaper than competitors and call center labor
Familiar
ThunderPhone