Company7 min read
Gepard is now a TTS vendor in jambonz
jambonz, the open-source telephony platform for voice AI, now ships nineninesix as a built-in TTS vendor: Gepard 1.0, 8 kHz mu-law, $5 per million characters.
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Nursultan Bakashov
Co-founder, nineninesix.ai
Co-author of the Gepard technical report. Works on real-time speech models and the infrastructure that serves them, and writes about the parts of text-to-speech that only show up in production.
Benchmarks12 min read
Coval TTS benchmark: Gepard vs 25 APIs
We ran Gepard 1.0 through Coval's public TTS harness against its 25 listed APIs. 68.7 ms to first audio, 20.5 ms of leading silence, 0 errors in 30 samples.
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Benchmarks5 min read
TTS latency benchmark: 50 ms to first audio
Four vendors, both transports, 240 measured calls, zero errors. Gepard returns first audio in 49 to 50 ms over WebSocket, about half the next fastest.
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Benchmarks6 min read
TTS API pricing in 2026: the real cost
Ten realtime voice vendors in one table. ElevenLabs Flash is $50 per million characters, Cartesia $30, ours $5. Here is what that means on your monthly bill.
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Engineering5 min read
How to fine-tune Gepard (and when not to)
Zero-shot cloning takes minutes and covers most cases. A LoRA fine-tune needs about 1 hour of clean audio, a full one needs 4 GPUs. Where each line falls.
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Engineering5 min read
Self-hosted TTS or an API: the crossover
The crossover sits near 290M characters a month, about 4,800 hours of audio. Below it the API wins on total cost, and the GPU bill is not the whole story.
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Product5 min read
Open weights or closed TTS: who wins when
Apache 2.0 grants more than most teams think. 4 decision branches, the licence traps in our own catalogue, and the 300M character mark where self-hosting wins.
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Engineering5 min read
Why Gepard runs on vLLM, and what it buys
One design rule shaped the whole model: it must run on stock vLLM without patching a single compute kernel. The result is 204x real time on one GPU.
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Research5 min read
KaniTTS to Gepard: which model to use
Three generations and 28 repos on Hugging Face. Gepard 1.0 is 555.7M parameters under Apache 2.0; KaniTTS weights are not. Which model to actually use.
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Engineering6 min read
How text to speech works, and how to choose
How modern TTS works, the 5 metrics vendors quote and which of them lie, and 8 questions to ask first. Why 200 ms of synthesis eats a whole latency budget.
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