Ultravox
Multimodal LLM that takes speech input directly, without a separate speech recognition stage, for real-time voice agents.
Infrastructure by Ultravox (Fixie)
Chalk Labs
Need help deploying Ultravox?
Chalk Labs sets up agents like this inside real teams: connected to your tools, tested on your data, with a human in the loop where it matters.
Get started
Setup steps are in the repository. Website · Docs · Repository
About
Use cases: voice-agents, model-inference
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Fact sheet
- Category
- Voice · speech to speech api
- Protocols
- sipultravox.ai
Plans
| Pay as You Go | $0 | 30 free minutes, then $0.05/min; up to 5 concurrent calls; SIP at $0.005/min; no surge pricing |
|---|---|---|
| Pro | $100/month | annual-rate price; no hard concurrency caps, outbound call scheduler, 5 custom voices, 20 RAG corpora; $0.05/min |
| Enterprise | Contact sales | custom; priority SLA, org support, customizable |
From the vendor's pricing page, read Oct 24, 2026.
Facts read from the vendor's own pages by claude-haiku-5-5 on Oct 24, 2026; a fact is shown only with the page it came from.
Signals
- Stars
- 4,583
- Forks
- 385
- Open issues
- 54
- Last commit
- Dec 12, 2025 (10 months ago)
- Last release
- Aug 18, 2025 (1 year ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- MIT
- Repository
- github.com/fixie-ai/ultravox
- Website
- www.ultravox.ai
- Docs
- docs.ultravox.ai
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
Done for you
Rather not set it up yourself?
Chalk Labs scopes, builds and runs agents for your team: the task audit, the eval harness, the integrations and the weekly ops report. Fixed scope, priced before we start.
See how we build AI agents →Read the case studies
Chalk Labs is a two-founder AI and growth studio. We build AI agents, CRMs and MVPs for Web3 and AI companies, and have shipped 50+ product and token launches.
- launches shipped
- 50+
- launches shipped
- media placements
- 500+
- media placements
- founders on every account
- 2
- founders on every account
Press we've placed: Forbes · CoinDesk · Decrypt · Cointelegraph · The Block
Rahil Jain, Co-founder, Chalk Labs. Ex-Goldman Sachs engineer. You talk to the person who builds it.
Get Ultravox running in your business
Tell us what you want to automate. A founder replies within one working day with a plan, not a pitch deck.
Cite this page
Ultravox. Agent Mart. https://agentmart.dev/infrastructure/ultravox (last updated 2026-10-24)