Reliable AI voice agents
from just 2 cents/minute.
Tired of AI that mishears users, disobeys prompts, and costs a fortune?
Set up a ThunderPhone agent in minutes and hear the difference.
GDPR Compliant
HIPAA CompliantHigh performance at low cost.
Save 80% or more on voice AI
Our ensemble architecture gets the performance you need, at the lowest cost possible. Spark is by far the lowest-cost model on the market, and Bolt and Storm are incredibly cost-effective for their intelligence levels.
Near-zero mistake rate
Storm (Extra Intelligence) scores a groundbreaking 99.4% on the industry-standard Big Bench Audio benchmark — virtually eliminating reasoning errors so your agents follow complex instructions without derailing.
Everything you need to deploy reliable voice agents.
Built-in testing before you go live
Run text or audio tests, manually or automatically. Test human-to-AI and AI-to-AI scenarios. Catch issues before your customers do.
Automatic quality monitoring on every call
ThunderPhone scans your call history and flags issues — misunderstood instructions, unexpected responses, edge cases — so you can continuously improve your agents.
Connect any integration in seconds
Paste a cURL command, import an OpenAPI spec, or upload a Postman collection — we configure your integration automatically. No SDKs, no webhooks, no docs to read.
New Integration
Paste a cURL command, import an OpenAPI spec, or drop in a Postman collection — we'll configure your integration automatically.
Your SIP trunk, connected in under a minute
Enter a few details from your VoIP account — we support Twilio, Telnyx, SignalWire, Vonage, Plivo, or any standard SIP trunk. ThunderPhone handles the rest automatically.
SIP Trunk Setup
Enterprise-ready from day one.
Everything you need to deploy voice agents at scale — with the compliance, flexibility, and support your business requires.
Enterprise implementations
Custom compliance requirements, dedicated support, and tailored onboarding for large deployments.
Data residency & zero retention
Choose your data region. Zero data retention available so call data is never stored beyond your session.
Custom voices
Use our 50+ high-quality voices or bring your own custom voice for a fully branded caller experience.
BAA signing
We sign Business Associate Agreements on request. HIPAA-compliant deployments available out of the box.
Flexible API
Integrate your systems with our flexible API.
Read the docs →
ThunderSocket — bring your own LLM
Connect your own LLM via ThunderSocket and we'll handle the rest of the voice stack. Only 2¢/min.
Ready to build your first phone agent?
Set up in minutes, scale to millions. Start for free — no credit card required.