Real-time Text-to-Speech API

A text-to-speech API gateway gives developers one API surface for multiple TTS engines, voices, and delivery paths. Telnyx acts as that gateway for Telnyx voices, supported provider models, custom voices, REST generation, WebSocket streaming, and in-call playback.

Telnyx supports native voice models and supported provider models. Current docs include KokoroTTS, Qwen3TTS, Ultra, and Grok, plus AWS Polly, Azure Speech, ElevenLabs, MiniMax, MurfAI, Resemble, and Inworld. Availability varies by interface, model, region, and account setup.

Choose based on the use case. Naturalness, latency, accent quality, language coverage, expressive controls, and price are all valid reasons to pick different models for different speech experiences.

Yes. Telnyx supports REST generation, WebSocket streaming, and in-call playback through Voice API and TeXML. That lets teams use TTS in live calls, AI agents, IVRs, apps, and other communication workflows.

Yes. Telnyx supports real-time text-to-speech through WebSocket streaming and in-call playback. Telnyx Ultra is documented for very low latency over REST, while other models vary by provider path, region, audio format, and endpoint. Test the full call or app flow before choosing a production voice.

Telnyx runs select voice models on Telnyx infrastructure. Other supported provider models process requests on provider infrastructure. Teams with data residency or routing requirements should confirm the model path, region, and interface before production rollout.

Telnyx publishes SOC 2 Type II, ISO 27001, PCI DSS, and GDPR compliance information through its Trust and Security resources. Compliance requirements still depend on the exact product workflow, model route, data type, and customer configuration, so regulated deployments should confirm the supported path before launch.

Telnyx gives teams one API surface for multiple supported TTS models, which can make fallback planning easier. Teams should test fallback voices, model behavior, regions, and provider behavior before treating any model as production failover.

Telnyx TTS starts at $3 per 1 million characters. Pricing varies by model, with volume discounts available for larger deployments. Telnyx does not charge per-seat fees for using the TTS API.

Yes. Voice Design Lab lets teams generate a new voice from a prompt, clone a voice from audio, or use custom voices in dubbing workflows. The current API supports Qwen3TTS (via the Telnyx provider) and MiniMax for custom voice creation and cloning. Additional provider integrations ship as they are wired in. Once the voice exists, usage is charged like that provider or model's normal voice usage.

Yes, with model-specific support. AWS Polly and Azure Speech support SSML paths, Ultra supports emotion controls, xAI Grok supports expressive speech tags, and other providers expose their own speed, pitch, volume, or style settings. Check the model docs before relying on a specific control in production.

Telnyx offers access to 3,900+ voices across 80+ languages through its broader TTS library. Voice availability, regional accents, and language support vary by engine, so production teams can choose the model that fits each experience.

Yes. Telnyx TTS supports multilingual speech experiences across supported models, with 80+ languages available in the broader voice library. Teams can choose voices by language, regional accent, model behavior, and cost requirements.

Yes. Telnyx lets developers switch supported TTS engines through the voice or provider configuration instead of rebuilding the application around a new provider. This is useful when teams need to tune for speed, quality, language support, or cost after launch.

Calling a provider directly can lock an application to that provider's models, pricing, controls, and integration pattern. Telnyx gives teams one TTS API for multiple supported models, custom voices, REST generation, WebSocket streaming, and in-call playback, so teams can change voices through configuration or API changes.

Standalone TTS providers focus on voice generation. Orchestration tools focus on routing between services. Telnyx combines TTS model choice with Voice API, TeXML, AI agents, STT, phone numbers, and communications infrastructure, so generated speech can be part of the live voice stack.

No. One Telnyx relationship covers the supported voices and models accessed through the Telnyx TTS API. Teams can manage the speech layer through one API key, one bill, and one support motion instead of separate provider contracts.