ThunderPhone
Self-tuning AI voice agents, from 2¢/min
88 followers
Self-tuning AI voice agents, from 2¢/min
88 followers
ThunderPhone is like Claude Code for voice AI. The Zeus harness automatically tunes voice agents on our platform, featuring the highest accuracy (99.4% on Big Bench Audio), and the cheapest calls (starting from just 2¢/min) on the market.
This is the 2nd launch from ThunderPhone. View more
Zeus by ThunderPhone
Launching today
Zeus is a fully agentic harness for voice AI: an AI agent that builds, tests and tunes your voice agents for you.
Zeus configures agents on the ThunderPhone voice AI stack, which combines multiple models at once to achieve higher accuracy (99.4% on Big Bench Audio) and lower price (from 2¢/min) than competitors based on 3-step STT-LLM-TTS pipelines or single speech-to-speech models.
Create an agent by talking to Zeus, or import one from Vapi, Retell, Bland or ElevenLabs.
Free Options
Launch Team
Render Sandboxes: a computer for every agentIsolated compute, persistent state and a real filesystem
Promoted
Hi folks, we're excited to announce ThunderPhone v3, featuring Zeus, which is like Claude Code for voice agents.
Part 1 of this launch is our new v3 stack.
Other voice AI platforms typically run on a 3-step STT-LLM-TTS pipeline, or on single speech-to-speech models.
Both of these approaches have issues with mishearing users and disobeying instructions on live calls, causing serious problems.
Our multi-model architecture addresses many of these issues, making calls more reliable in production. It hits 99.4% on Big Bench Audio - a record on models fast enough to take real calls.
The issue with the multi-model architecture is that it's hard to configure manually.
Thankfully, that'll be less of an issue because today, we're also launching Zeus, which is like Claude Code for your voice agents.
Unlike Claude Code, Codex, etc., it's good at spotting issues in real and simulated calls and optimizing the voice AI stack to maximize performance on those calls.
Configure an agent through Zeus, or import one from Retell, Vapi, etc. and watch its performance immediately start to improve with Zeus's help.
Zeus isn't just good at optimizing performance; it's also great at keeping costs down.
Over time, Zeus will configure the stack on your calls to be as good as you need for your priorities, but no heavier than that, so you won't overpay.
Moreover, we only charge a 17-25% margin above our own costs, so you'll be very unlikely to save money with a different stack than ThunderPhone, even if you build it from scratch.
Zeus itself is free for now, and you can try it out with $10 of free credits to use on voice agents - see it at https://thunderphone.com/
And you can see the more detailed writeup at https://thunderphone.com/blog/introducing-zeus
Zeus is still early, so you'll likely run into some hiccups - let us know if you do, and we'll fix them ASAP.