# TTS spelling accuracy

Published articles for TTS spelling accuracy.

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## Gradium TTS, upgraded: more accurate Text-To-Speech

DevFeed: [Gradium TTS, upgraded: more accurate Text-To-Speech](<https://devfeed.tech/articles/gradium-tts-upgraded-more-accurate-text-to-speech-81230.md>)

Original publisher: [Read original article](<https://gradium.ai/blog/gradium-tts-upgrade>)

Author: Gradium

Published: 2026-06-10T00:00:00Z

Content type: release

Language: en

Sources: [Gradium](<https://devfeed.tech/sources/gradium.md>)

Topics: [Conversational AI](<https://devfeed.tech/topics/conversational-ai.md>), [Speech Processing](<https://devfeed.tech/topics/speech-processing.md>)

Tags: [agents-in-production](<https://devfeed.tech/tags/agents-in-production.md>), [api](<https://devfeed.tech/tags/api.md>), [benchmark](<https://devfeed.tech/tags/benchmark.md>), [benchmarks](<https://devfeed.tech/tags/benchmarks.md>), [cartesia-sonic-3-5](<https://devfeed.tech/tags/cartesia-sonic-3-5.md>), [custom-voice-cloning](<https://devfeed.tech/tags/custom-voice-cloning.md>), [elevenlabs-flash-v2-5](<https://devfeed.tech/tags/elevenlabs-flash-v2-5.md>), [elevenlabs-multilingual-v2](<https://devfeed.tech/tags/elevenlabs-multilingual-v2.md>), [email-address-text-to-speech](<https://devfeed.tech/tags/email-address-text-to-speech.md>), [english](<https://devfeed.tech/tags/english.md>), [expressive-text-to-speech](<https://devfeed.tech/tags/expressive-text-to-speech.md>), [gradium-tts](<https://devfeed.tech/tags/gradium-tts.md>), [gradium-tts-upgrade](<https://devfeed.tech/tags/gradium-tts-upgrade.md>), [gradium-vs-cartesia](<https://devfeed.tech/tags/gradium-vs-cartesia.md>), [gradium-vs-elevenlabs](<https://devfeed.tech/tags/gradium-vs-elevenlabs.md>), [gradium-vs-inworld](<https://devfeed.tech/tags/gradium-vs-inworld.md>), [inworld-tts-1-5-max](<https://devfeed.tech/tags/inworld-tts-1-5-max.md>), [multilingual-text-to-speech](<https://devfeed.tech/tags/multilingual-text-to-speech.md>), [phone-number-text-to-speech](<https://devfeed.tech/tags/phone-number-text-to-speech.md>), [product](<https://devfeed.tech/tags/product.md>), [production](<https://devfeed.tech/tags/production.md>), [real-time-tts](<https://devfeed.tech/tags/real-time-tts.md>), [speech](<https://devfeed.tech/tags/speech.md>), [text-to-speech](<https://devfeed.tech/tags/text-to-speech.md>), [text-to-speech-model](<https://devfeed.tech/tags/text-to-speech-model.md>), [tts](<https://devfeed.tech/tags/tts.md>), [tts-acronyms](<https://devfeed.tech/tags/tts-acronyms.md>), [tts-benchmark-2026](<https://devfeed.tech/tags/tts-benchmark-2026.md>), [tts-pronunciation-accuracy](<https://devfeed.tech/tags/tts-pronunciation-accuracy.md>), [tts-prosody](<https://devfeed.tech/tags/tts-prosody.md>), [tts-spelling-accuracy](<https://devfeed.tech/tags/tts-spelling-accuracy.md>), [voice-agent-tts](<https://devfeed.tech/tags/voice-agent-tts.md>), [voice-agents](<https://devfeed.tech/tags/voice-agents.md>)

### AI overview

Gradium upgraded its text-to-speech model, reporting more natural speech and improved pronunciation of difficult inputs such as email addresses, phone numbers, acronyms, and codes. The company describes evaluation using objective metrics and listener tests, and says the model is now the default in its API with existing voices carried over.

### Source excerpt

Gradium TTS now runs on a new model: more natural prosody and substantially more accurate pronunciation on the cases that break voice agents in production, including spelling, acronyms, emails, phone numbers, and codes. It wins head-to-head against our previous model in all five languages, and leads real-time competitors (Cartesia Sonic 3.5, Inworld TTS 1.5 Max, ElevenLabs Flash v2.5 and Multilingual v2) on the hardest pronunciation cases. Available now as the new default, with custom voices carried over.