Releasesby GlyphGradium adds data residency configuration in Studio
Gradium updated Studio to allow admins on paid plans to configure data residency settings under Organization controls.
Gradium Release notes and new features
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Gradium releases
November 2026 digestA new speech-to-text model is now in production, with better transcription accuracy and end-of-turn detection
A new speech-to-text model is now in production, with better transcription accuracy and end-of-turn detection. It replaces the previous model in place, so you don't need to change your requests. See Speech-to-Text .
TTS output in resampled formats now starts without the extra 40 ms of silence
Gradium updated its TTS output to remove 40 ms of silence at the start of resampled audio chunks. Developers should now use start_s and stop_s parameters instead of assuming fixed chunk sizes.
You can now filter GET /voices/ by locale , gender and use_case , including combinations of these filters
The GET /voices/ endpoint now supports filtering by locale, gender, and use case. Additionally, voice responses now include a rank field to help prioritize custom and catalog voices.
Phonon brings text-to-speech to local devices, including phones, laptops, embedded devices and browsers
Phonon brings text-to-speech to local devices, including phones, laptops, embedded devices and browsers. Run speech generation locally for applications that need offline operation or want to keep inference on the device. Use voices from the catalog, or custom voices created through Gradium, in your local applications.
The Voice localizer is now in Studio, out of beta
The Voice localizer is now in Studio, out of beta. Pick a voice, describe the accent you want, and compare three takes at different strengths. The one you keep is saved as a new custom voice. You can also start from Localize in any voice's menu in the catalog. See the Voice Localization guide .
The voice catalog grows from about 390 to more than 1,400 voices
Gradium expanded its voice catalog to over 1,400 voices and added features for preview samples, usage exports, and pronunciation dictionary management.
Make a voice you already have speak another language or accent, with the same speaker
Make a voice you already have speak another language or accent, with the same speaker. Call POST /voice-generator/localize on a flagship or custom voice, pick an accent, and get candidates back in seconds to audition and convert like Voice Design candidates. GET /voice-generator/available-accents lists the accents you can target.
Our new Text-to-Speech model is now the default, with more expressive speech and lower latency
Our new Text-to-Speech model is now the default, with more expressive speech and lower latency. Existing requests using default use the new model without a setup change. gradium-tts-beta also routes to this model until the next TTS beta arrives. Keep that alias to follow future betas, or use default to stay on stable releases.
Clean up a voice you already have without changing its language or who is speaking
Clean up a voice you already have without changing its language or who is speaking. POST /voice-generator/enhance takes a flagship voice, a clone or a candidate and returns candidates with background noise reduced. Audition and convert them like Voice Design candidates. Voice Enhance is in beta; output quality will keep improving.
Our new Text-to-Speech model entered public beta with lower latency and more expressive speech
Our new Text-to-Speech model is available in public beta, with lower latency and more expressive speech. In our latest measurements, the beta reaches time to first audio in under 50 ms, against 225 ms for the production model. Latency varies with network conditions and input. Set model_name to "gradium-tts-beta" in your TTS setup to use the beta.
Gradium has achieved ISO 27001 certification, independently audited by A-LIGN
Gradium has achieved ISO 27001 certification, independently audited by A-LIGN. Visit our Trust Center for certification details and security documentation .
Studio has a redesigned voice catalogue, new voice search controls in Text-to-Speech, and more ways to...
Studio has a redesigned voice catalogue, new voice search controls in Text-to-Speech, and more ways to preview voices in Voice Design. Voice catalogue: Customize layout between tile or list views, group voices by language, and choose which properties to display.
Create a voice from a written description, no audio sample needed
Create a voice from a written description, no audio sample needed. Describe the accent, age and character you need, generate up to five candidates, and keep your favourite. The voice works with the same Text-to-Speech endpoint as any catalogue voice. In our blind listening evaluation, native speakers judged how well voices matched accent prompts.
A new Gradium Text-to-Speech model is live and is now the default
A new Gradium Text-to-Speech model is live and is now the default. Existing voices, including custom voices, work as-is. The model reads the structured entities that break voice agents in production, such as phone numbers, email addresses, IBANs and reference codes, with no pre-processing or text normalization needed.
Speech-to-Text requests now require a language in json_config
Speech-to-Text requests now require a language in json_config . Our ASR gives its best results when the language is known, so set it whenever you can: en , fr , es , pt , or de . When the language is not known ahead of time, pass any and the model detects it from the audio. Requests that already set a language or any are unaffected.
2026.02
We're excited to announce major updates to the Gradium API and Gradium Studio, delivering enhanced text-to-speech (TTS) and speech-to-text (STT) capabilities for developers and enterprises.
- Model selector in Gradium Studio : the Text-to-Speech page now has a Model dropdown to switch between the...
- Model selector in Gradium Studio : the Text-to-Speech page now has a Model dropdown to switch between the production model and gradium-tts-beta , showing each model_name with a copy button. Shareable studio links : pre-configure a session with ?voice= , ?model_name= , ?text= and ?language= and share the full setup as a single link.
Our live translation models ( stt-translate for translated transcription and s2s-translate for...
Our live translation models ( stt-translate for translated transcription and s2s-translate for Speech-to-Speech) now produce more natural, more accurate translations, with better context understanding across a conversation. The quality gains are most noticeable on conversational speech. See Speech-to-Speech and the Speech-to-Text overview to get started.
A new Gradium Text-to-Speech model is available in public beta
A new Gradium Text-to-Speech model is available in public beta. It handles complex text natively, with no pre-processing or normalization on your side: phone numbers in national and international formats, email addresses, IBAN numbers, time expressions, reference codes, measurements, URLs and ordinals.
A new Speech-to-Text model is now live on the standard endpoint
A new Speech-to-Text model is now live on the standard endpoint. Transcription is more robust on low volume audio, so soft speakers and far field microphones are recognised with improved reliability. Endpointing is more reactive, so the end of an utterance is detected sooner and voice agents can start responding with less delay.
Get the vocabulary specific to your product transcribed correctly: brand and product names, people, places...
Get the vocabulary specific to your product transcribed correctly: brand and product names, people, places, drugs, and jargon. Pass a dictionary of the terms you care about in your STT json_config , and the model gives them priority while decoding, in real time, with no retraining.
Gradium TTS now runs on an upgraded default model focused on more expressive speech and better reliable...
Gradium TTS now runs on an upgraded default model focused on more expressive speech and better reliable pronunciation for production voice agents. Improved natural prosody, phrasing, intonation, and pacing. This is especially noticeable in conversational turns and longer passages.