Meet Lightning TTS v3
Text to Speech built for Voice Agents
100ms latency. 15 languages. Built for human conversation.
100ms latency. 15 languages. Built for human conversation.
The phone rang at 3:17 a.m. sharp, sudden, wrong for that hour. Outside, the street was silent, the kind of silence that makes you listen twice. When the voice finally spoke on the other end, it siad only one word: Run. And somewhere, not very far away, a door slowly creaked open.
The voice infrastructure teams trust at scale.
Production-ready audio quality
Broadcast-grade output for podcasts, audiobooks, and game characters
Multilingual and adaptive
15 languages. Automatic detection. Seamless code-mixing mid-sentence.
Production-ready audio quality
Broadcast-grade output for podcasts, audiobooks, and game characters
Multilingual and adaptive
15 languages. Automatic detection. Seamless code-mixing mid-sentence.
Instant cloning in seconds
Clone any voice in under 10 seconds. no professional equipment required
Real-time at scale
Maintain 20+ concurrent streams with 100ms latency
Instant cloning in seconds
Clone any voice in under 10 seconds. no professional equipment required
Real-time at scale
Maintain 20+ concurrent streams with 100ms latency
One model. Every voice use case.
From real-time agents to long-form narration - Lightning adapts to every context.
Voice Agents
Conversational AI that sounds like a real person not a script reader.
Gaming
Dynamic character voices with emotional range.
Audiobooks
Long-form narration with natural prosody and pacing.
Media
Presenter-quality voice for intros, ads, and full episodes.
Localisation
Generates native-sounding speech across 15 languages
Accessibility
Generates clear speech optimised for screen readers and assistive tools.
Audio quality that leads every benchmark.
Independent benchmarks put Lightning ahead of every major model on the metrics that matter
Create high-quality voice clones for production use
Upload a sample. Get a production-ready voice clone in under 10 seconds.
Cloned Voice
High-fidelity voice replication
Lauren
Original Voice
Lauren
Original Voice
Common questions about Lightning TTS
Lightning V3.1 supports 15 languages, with more being added regularly. Best in class languages include English, Spanish, Hindi and Tamil. We have a strong coverage across Europe with French, German, Italian, Portuguese, Swedish, and Dutch, along with Indic support with Hindi, Tamil, Telugu, Malayalam, Kannada, Marathi, and Gujarati. If your language isn't on the list yet, it likely will be soon.
Under 15 seconds of audio is all it takes. The clone is ready instantly and built to deploy at any scale from day one.
Lightning V3.1 delivers under 100ms time-to-first-audio. It was built specifically for real-time applications, so low latency isn't a trade-off you make. It's the default.
You get $10 in free credits when you sign up, no strings attached. After that it's pay-as-you-go, so you only pay for what you use. For teams that need massive scale or high concurrency, we offer custom enterprise plans. Reach out to sales and we'll build something that works for you.
Yes, our voice agents can interact with debtors in real time, offering flexible payment options and negotiating settlements based on predefined rules—improving recovery without human intervention.
Yes, our voice agents can interact with debtors in real time, offering flexible payment options and negotiating settlements based on predefined rules—improving recovery without human intervention.
Your Data, Secure with Enterprise Security
Your Data, Secure with Enterprise Security
Your data is secured by top SOC 2 Type 2, HIPAA, and PCI compliance standards, both in the cloud and on-premises.
Your data is secured by top SOC 2 Type 2, HIPAA, and PCI compliance standards, both in the cloud and on-premises.
We comply with HIPAA to protect your health information.
Smallest.ai has undergone SOC 2 Type II attestation and undergoes annual audits.
Strict internal audit processes for data management.