How much VRAM does ZONOS2 need?

Q4_K is exactly 4,917,891,968 bytes (4.58 GiB) in weights. Add the KV cache, which depends on context length, plus roughly half a gigabyte of runtime overhead.

Zyphra · audio tts

ZONOS2

Zyphra/ZONOS2

ZONOS2 at Q4_K is exactly 4,917,891,968 bytes (4.58 GiB / 4.92 GB)

From the file· summed from 1 file(s)

Parameters

—

Architecture

dac

Context

—

native (config.json)

License

apache-2.0

Shipped quantizations

● exact bytes, summed from published files

Quant	Size●	Exact bytes●	Effective bpw●	Tensors●	Publisher
Q4_K	4.58 GiB	4,917,891,968	—	—	Zyphra
Q5_K	5.42 GiB	5,823,861,632	—	—	Zyphra
Q6_K	6.32 GiB	6,786,454,400	—	—	Zyphra
Q8_0	7.96 GiB	8,541,770,624	—	—	Zyphra
F16	14.28 GiB	15,336,543,104	—	—	Zyphra

Compare with

same modality, comparable size

vs Ace-Step1.5 vs Qwen3-TTS-12Hz-0.6B-Base vs OmniVoice vs orpheus-3b-0.1-ft vs s2-pro vs Fun-CosyVoice3-0.5B-2512 All alternatives →Will it fit on my card? →

Why other calculators give a different number

A parameters × bits ÷ 8 estimate puts Q4_K at roughly 0.00 GiB. The real file is 4.58 GiB, because a quantization is a mixture and some tensors are always kept at higher precision.

Architecture

Architecture unavailable — this repository is gated and no ungated mirror was found. Exact file sizes above are still authoritative; only the KV math needs the config.

Questions people ask

How much VRAM does ZONOS2 need?: Q4_K is exactly 4,917,891,968 bytes (4.58 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
Which quantization of ZONOS2 should I use?: Q4_K_M is the usual default. Pick the largest quantization that fits your card at the context you actually need — the table above gives exact sizes for every one published.