Smallest AI: Real-Time Voice AI Platform for TTS, STT, and Voice Agents

Smallest AI is a real-time voice AI platform built on smaller, specialized models instead of one massive general-purpose system — designed for faster, more efficient performance in speech synthesis, transcription, and conversational voice agents.

Core Models

The platform includes four core models, each purpose-built for a specific part of the voice AI stack.

Lightning — Text-to-Speech

Lightning delivers text-to-speech at ~100ms latency across 15+ languages, with automatic language detection, mid-sentence code-switching, and instant voice cloning from just 5-15 seconds of audio.

Pulse — Speech-to-Text

Pulse offers accurate transcription with speaker and emotion detection across 38+ languages, plus built-in PII/PCI redaction — no preprocessing required.

Electron — Small Language Model

Electron is a sub-3B parameter language model optimized specifically for voice agents, with an OpenAI-compatible chat completions API and sub-300ms time-to-first-token.

Hydra — Speech-to-Speech

Hydra is one of the first native speech-to-speech models built for production, processing speech and text simultaneously for full-duplex conversation without a cascaded pipeline.

Atoms: The No-Code Voice Agent Platform

Atoms lets teams create, test, and deploy production voice agents in minutes — with knowledge base grounding, outbound calling campaigns, telephony in 40+ countries, webhooks, analytics, and mobile SDKs for iOS, Android, React Native, and Flutter. A full conversational turn completes in under 800ms end to end.

For teams with strict data residency requirements, Smallest AI also offers on-premise deployment, running inference directly on customer-owned hardware.

Who Uses Smallest AI

Smallest AI is used across debt collection, real estate, and e-commerce to automate high-volume voice interactions without sacrificing conversation quality.

Security & Compliance

The platform is SOC 2 Type II, HIPAA, GDPR, ISO 27001, and PCI-DSS compliant — full details are published on the Smallest AI trust center. On-premise deployment is available for regulated industries.

Pricing

Pricing is usage-based, with a free tier offering $10 in credits to start. See the full breakdown on the pricing page, or contact sales for custom Enterprise plans with SLA guarantees and dedicated support.

Developers

Smallest AI ships production-ready API documentation for both the raw model APIs and the Atoms agent platform, along with a growing integrations ecosystem covering LiveKit, Pipecat, Vapi, n8n, Vonage, and Plivo. Early-stage startups can also apply to the Startup Grants program for free credits and infrastructure support.

Alternatives to Smallest AI

Teams comparing voice AI platforms often look at Deepgram, AssemblyAI, ElevenLabs, Resemble AI, and Cartesia alongside Smallest AI.