---
title: GenFirst Text-to-Image
emoji: 🎨
colorFrom: indigo
colorTo: gray
sdk: gradio
sdk_version: 6.31.0
app_file: app.py
short_description: GenFirst EiT MMDiT-XL/2 512px text-to-image
python_version: "3.12"
startup_duration_timeout: 30m
license: cc-by-nc-4.0
models:
  - ByteDance-Seed/GenFirst
  - openai/clip-vit-large-patch14
---

Demo of the **GenFirst** text-to-image prior (EiT, MMDiT-XL/2, variant A, 512x512) from
[ByteDance-Seed/GenFirst](https://huggingface.co/ByteDance-Seed/GenFirst).

At startup the Space loads the official files directly from the model repo:
- the **EMA** weights of `text-to-image/variant-a/eit-t2i-variant-a-512.pt`. Only the EMA tensors (~5.3 GB of the 21 GB checkpoint) are fetched, using HTTP range reads (`lazy_ckpt.py`).
- the paired end-to-end FLUX VAE `vae/e2e-flux-vae-sit-imagenet-s2` and its latent statistics.

Sampling runs under fp16 autocast, as in the reference `infer_t2i.py`, and follows the authors' GenEval protocol: 50-step Euler, CFG 7.0 on the interval [0.35, 1.0].

Weights are © ByteDance, licensed **CC BY-NC 4.0** (non-commercial research use only). Code is ported from the MIT-licensed GitHub repository
(the MMDiT comes from Stability-AI/sd3-ref, MIT). Example prompts come from the authors' `infer_t2i.py` defaults and their GenEval smoke set.