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New AssemblyAI-TTS-1: Text-to-speech for voice agents. Learn more platform Platform overview Models, APIs, and infrastructure in one place. Build voice into any product, on any stack. transcribe Pre-recorded Speech-to-Text API Realtime Speech-to-Text API Sync Speech-to-Text API understand Speech Understanding API Guardrails and Safety LLM Gateway interact Dictation API Text-to-Speech API new inference Self Hosted Voice AI Cloud use cases Voice Agents AI Notetakers Call Analytics Healthcare Medical Transcription Dictation Agent Assist AI Scribes languages English Spanish Portuguese French German Russian Hindi Dutch Japanese Italian All 99 Languages customers All customer stories Top Voice AI companies are building with Assembly. See all stories Zoom leverages AssemblyAI to help advance its AI research and development. Read the story Siro achieves a 90% reduction in customer complaints and support tickets. Watch the video resources Documentation API Reference Cookbooks Support Changelog Status Latest Release Text-to-Speech API Our first text-to-speech model, AssemblyAI-TTS-1, is built for voice agents, on live calls. It sounds natural, responds fast, and keeps callers on the line. Learn more resources Blog Partners Research Benchmarks Security Security Protecting your data is our priority AssemblyAI uses enterprise-grade security practices to keep your data safe. We approach security by design and default. View trust center Talk to sales Security Your data stays yours Every request follows the same path: audio in, transcript out, deleted on a documented schedule. How long anything is kept depends on the API, and you can shorten it. Audio received Sent over an encrypted TLS 1.2+ connection Transcript delivered Returned to you via API response or webhook Deleted on schedule Removed per its retention schedule, or on request via the API Retention you control Streaming keeps no audio or transcripts once you opt out of model training. For pre-recorded audio, set a time-to-live as low as one hour, or delete transcripts on demand. Opt out of model training Paid accounts can opt out from the Data Controls page. Data under a signed BAA or sent to our EU servers is never used for training. Encrypted end to end Data is encrypted in transit with TLS 1.2+ and at rest with AES. Compliance Independently verified Our controls are audited by independent third parties. The latest evidence, reports, and updates always live in our trust center. SOC 2 Type 2 report We maintain a SOC 2 Type 2 report covering security, availability, and confidentiality, audited annually by an independent firm. Download the latest report anytime in our trust center. Penetration tests and vulnerability scans We conduct third-party penetration tests and run vulnerability scans on a regular cadence across our infrastructure and applications. Practices Defense in depth Security is not one control, it is layers of them. From how engineers reach production to how we ship code and select vendors, each layer is built to hold on its own. Access control Role-based access, SSO, and least-privilege permissions govern access to production systems. Infrastructure security Hardened cloud infrastructure with network isolation and continuous configuration monitoring. Monitoring and logging Centralized logging and continuous monitoring detect and alert on anomalous activity. Incident response A documented incident response process with defined roles, escalation paths, and post-incident reviews. Secure development Code review, dependency scanning, and security checks are built into our development lifecycle. Vendor management Third-party vendors are reviewed for security posture before and throughout engagement. Full details in our docs Our documentation is the source of truth for how each API handles retention, encryption, model training, and compliance. Browse the security FAQ Deployment options The same security, wherever you run Run on our fully managed cloud or inside your own environment. The controls, defaults, and guarantees stay the same either way. Managed AssemblyAI Cloud Fully managed infrastructure with encryption, access controls, and monitoring built in. Retention and model-training controls are managed self-serve from your dashboard, with per-API details in our docs. Explore deployments Self-hosted Self-Hosted Voice AI Run our models inside your own environment. Audio never leaves your network boundary, with the same controls enforced on your terms. Explore deployments Common questions