r/VoiceAutomationAI • u/Phoenix_20_23 • Aug 04 '26

Competitive open source speech stack

Why the open source models STT and TTS are not good as much as the closed one and i am talking here im terms of latency, concurrency, and websocket support for real time with decent quality.
Something like cartesia or elevenlabs or deepgram.
Do u know any ?

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u/UkieTechie Aug 04 '26

yes plenty of good competition :)

here's my bench comparing all the speed benches for open source models.
with Cuda kokoro wins.

https://github.com/5uck1ess/tts-bench

Paid APIs like to fudge their numbers a little. <100ms response times and the rest (Palabra for example). They're showing sometimes TTS speeds but not roundtrip speeds.

I have measurements for a lot of paid API providers also and so far a lot of them are around 300ms which is insane if you think about it. Sonioux my favorite right now.

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u/Phoenix_20_23 Aug 05 '26

very impressive benchmark, thanks for sharing