F5-TTS
Flow-matching non-autoregressive TTS built on a Diffusion Transformer (DiT) backbone with ConvNeXt text refinement. Trained on the 100K-hour Emilia dataset; supports zero-shot voice cloning with strong naturalness and low RTF (~0.15 on a single GPU).
Architecturally interesting and high-quality, but the non-commercial license rules it out for most products. Track for the inevitable commercial-friendly successor.
Overview
Flow-matching non-autoregressive TTS built on a Diffusion Transformer (DiT) backbone with ConvNeXt text refinement. Trained on the 100K-hour Emilia dataset; supports zero-shot voice cloning with strong naturalness and low RTF (~0.15 on a single GPU).
Strengths
- Flow-matching architecture — fast and stable, no autoregressive drift
- Zero-shot voice cloning competitive with XTTS-v2
- Strong English + Mandarin out of the box; community fine-tunes for more languages
- RTF ~0.15 on consumer GPU; faster than diffusion-based competitors
Weaknesses
- CC-BY-NC-4.0 — research only, no commercial use without separate licensing
- Mandarin and English only in the base checkpoint; other languages need fine-tunes
- Diffusion-style sampling means GPU is effectively mandatory
- Less mature tooling ecosystem than Coqui/Piper
Quantization variants
Each quantization trades model quality for file size and VRAM. Q4_K_M is the most popular starting point.
| Quantization | File size | VRAM required |
|---|---|---|
| Q4_K_M | 0.2 GB | 1 GB |
Get the model
HuggingFace
Original weights
Source repository — direct quantization required.
Hardware that runs this
Cards with enough VRAM for at least one quantization of F5-TTS.
Models worth comparing
Same parameter band, plus what's one tier above and below — so you can decide what actually fits your hardware.
Frequently asked
What's the minimum VRAM to run F5-TTS?
Can I use F5-TTS commercially?
What's the context length of F5-TTS?
Source: huggingface.co/SWivid/F5-TTS
Reviewed by RunLocalAI Editorial. See our editorial policy for how we research and verify model claims.
Related — keep moving
Verify F5-TTS runs on your specific hardware before committing money.