Last updated 06-28-2026
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Smallest AI
Smallest AI is a real-time voice platform for building production voice agents and audio APIs. Teams use it to deploy conversational phone agents, run outbound campaigns, and plug fast text-to-speech, speech-to-text, and speech-to-speech models into their own products. It is aimed at developers and enterprises that need low-latency voice at scale across healthcare, debt collection, real estate, e-commerce, and other call-heavy workflows.
The company builds small, specialized models instead of one giant general model. Lightning handles text-to-speech with about 100ms latency across 15+ languages, Pulse transcribes in 38+ languages with speaker and emotion detection, Electron is a sub-3B language model, and Hydra is a native speech-to-speech model. Voice agents get a no-code playground plus APIs, with knowledge bases, version history, telephony, and campaign tooling in one stack.
Smallest AI targets both builders prototyping in the playground and enterprises shipping regulated workloads. The platform is ISO 27001, SOC 2 Type II, GDPR, and HIPAA compliant, with on-prem deployment, SSO, RBAC, and optional HIPAA zero-data-retention for teams that cannot send audio to shared cloud infrastructure.
Lightning TTS hits about 100ms latency across 15+ languages for live agents
Pulse STT transcribes 38+ languages with speaker diarization and emotion detection
Build inbound or outbound voice agents from templates in the Atoms playground
Upload docs and FAQs so agents answer from a grounded knowledge base
Native Hydra speech-to-speech model for end-to-end voice conversations
Integrates with LiveKit, Vapi, n8n, Vonage, Plivo, and TrueFoundry
ISO 27001, SOC 2 Type II, GDPR, and HIPAA compliance with on-prem options
Pay-as-you-go tier lets teams start building voice agents without a sales contract.
Sub-100ms Lightning TTS and 64ms Pulse STT latency suit real-time voice agent pipelines.
One platform covers agent building, telephony campaigns, and standalone audio APIs.
ISO 27001, SOC 2 Type II, GDPR, and HIPAA compliance with on-prem deployment for regulated industries.
Official integrations with LiveKit, Vapi, n8n, Vonage, and Plivo reduce glue code.
Voice cloning, Electron SLM access, and on-prem models require an enterprise plan.
Pay-as-you-go TTS is limited to 15 concurrent streams and 100 requests per minute.
Per-minute and per-character API pricing can climb quickly on high-volume call centers.
What is Smallest AI?
Smallest AI is a voice platform for building real-time voice agents and audio APIs. It offers Lightning text-to-speech, Pulse speech-to-text, Electron language models, and Hydra speech-to-speech, plus an agent builder for inbound and outbound phone workflows. Developers can use APIs and SDKs, while teams can configure agents in a visual playground.
Does Smallest AI have a free plan?
Yes. Smallest AI lets you start building voice agents for free through its pay-as-you-go tier. You can sign up at app.smallest.ai and scale usage as you go, with per-minute and per-character pricing for models when you exceed free limits.
How much does Smallest AI cost?
Smallest AI uses pay-as-you-go pricing for its Models API. Pulse pre-recorded transcription is about $0.003 per minute, Pulse realtime is about $0.004 per minute, and Lightning V3.1 text-to-speech is about $0.175 per 10,000 characters. Enterprise plans with custom concurrency, on-prem deployment, and compliance features are available through sales.
What voice models does Smallest AI offer?
Smallest AI offers Lightning for text-to-speech with sub-100ms latency in 15+ languages, Pulse for speech-to-text in 38+ languages with emotion and speaker detection, Electron as a sub-3B language model, and Hydra as a native speech-to-speech model. Voice cloning is available on enterprise plans.
Is Smallest AI HIPAA and SOC 2 compliant?
Yes. Smallest AI is ISO 27001, SOC 2 Type II, GDPR, and HIPAA compliant. Enterprise customers can add HIPAA zero-data-retention for $1,000 per month, request on-prem deployment, and get SSO and RBAC through the enterprise plan.
What integrations does Smallest AI support?
Smallest AI integrates with agent frameworks like LiveKit and Pipecat, platforms like Vapi and Dograh, automation tools including an official n8n community node, telephony providers Vonage and Plivo, and the TrueFoundry AI Gateway. JellyPod Speech SDK brings Lightning TTS to JavaScript and TypeScript apps.
Can I use Smallest AI for outbound phone campaigns?
Yes. Smallest AI voice agents support outbound campaign creation, telephony number rental or bring-your-own-number setup, advanced retry logic for unanswered calls, and analytics to track results. The platform handles both inbound and outbound voice workflows from one interface.