---
language:
- en
library_name: transformers
pipeline_tag: text-generation
license: apache-2.0
base_model:
- Tesslate/UIGEN-FX-4B-Preview
tags:
- web-generation
- html
- css
- tailwind-css
- ui-generation
- web-design
- small-model
- qwen3
- transformers
model-index:
- name: UIGEN-FX-4B-Preview
  results: []
datasets:
- Tesslate/UIGEN-T2
---
<style>
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/* ===== Layout & Components ===== */
*{ box-sizing:border-box }
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</style>

<!-- Add class="on-light" to .wrap if host forces light background and ignores color-scheme -->
<div class="wrap">

  <div class="hero">
    <div class="alert">@@@ ALERT @@@ — Research Preview: some generations may not be ready for production. Use repeat_penalty or frequency_penalty at >= 1.1</div>
    <span class="kicker">Tesslate • UIGEN Series</span>
    <h1>UIGEN-FX-4B-RL-Preview</h1>
    <p class="tagline">
      <strong>FX</strong> = “Frontend Engineer.” This upgrade in the UIGEN line focuses on <strong>better visual polish</strong>,
      <strong>functional structure</strong>, and <strong>web-ready markup</strong> to ship cleaner, more complete websites from a single prompt.
      This model was trained on A11y, Axe, and Lighthouse scores to improve SEO, Accesibility, and reproducibility for users. 
    </p>

  <div style="display:flex; gap:12px; flex-wrap:wrap; margin:14px 0 2px">
    <span class="pill">Open weights</span>
    <span class="pill">Web-only bias</span>
    <span class="pill">Mobile-first output</span>
    <span class="pill">Minimal JS by default</span>
  </div>

  <div style="display:flex; gap:12px; flex-wrap:wrap; margin-top:14px">
    <a class="btn" href="https://huggingface.co/Tesslate/UIGEN-FX-4B-Preview">Model Repo</a>
    <a class="btn ghost" href="https://designer.tesslate.com/">Try in Designer</a>
    <a class="btn ghost" href="https://uigenoutput.tesslate.com">Demos</a>
    <a class="btn ghost" href="https://tesslate.com">Website</a>
    <a class="btn ghost" href="https://discord.gg/EcCpcTv93U">Discord</a>
  </div>

  <figure class="screens">
    <img alt="Hero sample" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/XnvaCsQedG5HgOP1NgiUY.png">
    <img alt="Pricing sample" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/-Z6cHx_pvQIy69nVVbzFu.png">
    <img alt="Features sample" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/mTKc_Foro9VfozsH-6pmK.png">
    <img alt="Hero alt" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/nFaWL_tEU1URlks24qlBA.png">
    <img alt="Pricing alt" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/6ZUhm4jJld1w8BHeaXGA4.png">
    <img alt="Features alt" src="https://cdn-uploads.huggingface.co/production/uploads/64d1129297ca59bcf7458d07/_qXbVgYGlKVfY4IONEkhR.png">
  </figure>
  </div>

  <hr/>

  <div class="grid grid-2" style="margin-top:1.2rem">
    <div class="card">
      <h3>What is FX?</h3>
      <p>
        <strong>UIGEN-FX-4B-Preview</strong> is a 4B parameter UI generation model tuned to behave like a
        <em>frontend engineer across 22 Frameworks. </em>
      </p>
    </div>
    <div class="card">
      <h3>Why 4B?</h3>
      <p>
        Small enough for laptops and fast iteration, while keeping strong structure and visual consistency.
        FX emphasizes <em>layout rhythm, spacing, and component composition</em> to reduce cleanup work.
      </p>
    </div>
  </div>

  <hr/>

  <h2>Quickstart</h2>

  <h3>Transformers</h3>
  <div class="codeblock"><pre>
from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

model_id = "Tesslate/UIGEN-FX-4B-Preview"
tok = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

prompt = """Make a single-file landing page for 'LatticeDB'.
Style: modern, generous whitespace, Tailwind, rounded-xl, soft gradients.
Sections: navbar, hero (headline + 2 CTAs), features grid, pricing (3 tiers),
FAQ accordion, footer. Constraints: semantic HTML, no external JS."""

inputs = tok(prompt, return_tensors="pt").to(model.device)
out = model.generate(**inputs, max_new_tokens=2200, temperature=0.6, top_p=0.9)
print(tok.decode(out[0], skip_special_tokens=True))
</pre></div>

  <h3>vLLM</h3>
  <div class="codeblock"><pre>
vllm serve Tesslate/UIGEN-FX-4B-Preview \
  --host 0.0.0.0 --port 8000 \
  --max-model-len 65536 \
  --gpu-memory-utilization 0.92
</pre></div>

  <h3>sglang</h3>
  <div class="codeblock"><pre>
python -m sglang.launch_server \
  --model-path Tesslate/UIGEN-FX-4B-Preview \
  --host 0.0.0.0 --port 5000 \
  --mem-fraction-static 0.94 \
  --attention-backend flashinfer \
  --served-model-name UIGEN-FX-4B-Preview
</pre></div>

  <blockquote><strong>Tip:</strong> Lower temperature (0.4–0.6) yields stricter, cleaner markup; raise it for more visual variety.</blockquote>

  <hr/>

  <h2>Suggested Inference Settings</h2>
  <table>
    <thead><tr><th>Param</th><th>Value</th><th>Notes</th></tr></thead>
    <tbody>
      <tr><td><code>temperature</code></td><td>0.6</td><td>Balance creativity &amp; consistency (lower if quantized)</td></tr>
      <tr><td><code>top_p</code></td><td>0.9</td><td>Nucleus sampling</td></tr>
      <tr><td><code>top_k</code></td><td>40</td><td>Optional vocab restriction</td></tr>
      <tr><td><code>max_new_tokens</code></td><td>1200–2500</td><td>Single-file sites often fit &lt; 1800</td></tr>
      <tr><td><code>repetition_penalty</code></td><td>1.08–1.15</td><td>Reduces repetitive classes/markup</td></tr>
    </tbody>
  </table>

  <hr/>

  <h2>Prompts that work well</h2>
  <div class="grid grid-2">
    <div class="card">
      <h3>Starter</h3>
      <div class="codeblock"><pre>
Make a single-file landing page for "RasterFlow" (GPU video pipeline).
Style: modern tech, muted palette, Tailwind, rounded-xl, subtle gradients.
Sections: navbar, hero (big headline + 2 CTAs), logos row, features (3x cards),
code block (copyable), pricing (3 tiers), FAQ accordion, footer.
Constraints: semantic HTML, no external JS. Return ONLY the HTML code.
</pre></div>
    </div>
    <div class="card">
      <h3>Design-strict</h3>
      <div class="codeblock"><pre>
Use an 8pt spacing system. Palette: slate with indigo accents.
Typography scale: 14/16/18/24/36/56. Max width: 1200px.
Avoid shadows &gt; md; prefer borders/dividers; keep line-length ~68ch.
</pre></div>
    </div>
  </div>

  <hr/>

  <h2>Quantization &amp; VRAM (example)</h2>
  <table>
    <thead><tr><th>Format</th><th>Footprint</th><th>Notes</th></tr></thead>
    <tbody>
      <tr><td>BF16</td><td>~8.1 GB</td><td>Fastest, best fidelity</td></tr>
      <tr><td>GGUF Q5_K_M</td><td>~2.9 GB</td><td>Great quality/size trade-off</td></tr>
      <tr><td>GGUF Q4_K_M</td><td>~2.5 GB</td><td>Laptop-friendly</td></tr>
    </tbody>
  </table>

  <hr/>

  <h2>Intended Use &amp; Scope</h2>
  <ul>
    <li><strong>Primary:</strong>React, Tailwind, Javascript, Static Site generators, Python Frontend WebUI</li>
    <li><strong>Secondary:</strong> Component blocks (hero, pricing, FAQ) for manual composition</li>
  </ul>

  <details>
    <summary><strong>Limitations</strong></summary>
    <ul>
      <li>Accessibility: headings/labels are encouraged; ARIA coverage may need review.</li>
      <li>Complex widgets: JS kept minimal unless requested; consider post-edit for heavy interactivity.</li>
    </ul>
  </details>

  <details>
    <summary><strong>Ethical Considerations</strong></summary>
    <ul>
      <li>Use rights-cleared assets when adding logos/images.</li>
      <li>Curate prompts responsibly; review outputs before production use.</li>
    </ul>
  </details>

  <hr/>

  <h2>Training Summary (research preview)</h2>
  <ul>
    <li><strong>Base:</strong> <code>Qwen/Qwen3-4B-Instruct-2507</code></li>
    <li><strong>Objective:</strong> Web-only bias; reward semantic structure, spacing rhythm, responsive blocks; improved visual polish vs earlier UIGEN releases.</li>
    <li><strong>Data:</strong> Curated HTML/CSS/Tailwind snippets, component libraries, synthetic page specs &amp; layout constraints.</li>
    <li><strong>Recipe:</strong> SFT with format constraints → instruction tuning → preference optimization on style/structure.</li>
    <li><strong>Context:</strong> effective ~64k; default generations sized for practical single-file pages.</li>
  </ul>

  <hr/>

  <h2>Community</h2>
  <ul>
    <li><strong>Examples:</strong> <a href="https://uigenoutput.tesslate.com">uigenoutput.tesslate.com</a></li>
    <li><strong>Discord:</strong> <a href="https://discord.gg/EcCpcTv93U">discord.gg/EcCpcTv93U</a></li>
    <li><strong>Website:</strong> <a href="https://tesslate.com">tesslate.com</a></li>
  </ul>

  <blockquote>“FX aims to ship what a frontend engineer would: clean structure first, pretty pixels second.” — Tesslate Team</blockquote>

  <hr/>

  <h2>Citation</h2>
  <div class="codeblock"><pre>
@misc{tesslate_uigen_fx_4b_2025,
  title   = {UIGEN-FX-4B-Preview: Frontend Engineer-tuned web generation (Research Preview)},
  author  = {Tesslate Team},
  year    = {2025},
  url     = {https://huggingface.co/Tesslate/UIGEN-FX-4B-Preview}
}
</pre></div>
</div>