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Cataloged from lightonai/LightOnOCR-3-1B
All models by lightonai βSame architecture as LightOnOCR-2-1B, new capabilities. LightOnOCR-3-1B keeps the architecture of LightOn's previous LightOnOCR-2 models, so switching requires no change, and adds the new grounding, image description and chart extraction features.
LightOnOCR-3 is a new family of highly performant lightweight OCR models. Compared to the previous generation, they bring significant improvements in speed and transcription quality and introduce new visual understanding features: the models now output bounding box coordinates with labels for all visual elements of a document, short descriptions of images, and the numerical data of figures and charts. With these capabilities, they offer a ready-to-use, easier-to-maintain alternative to complex document understanding pipelines.
The models come in three sizes. The 1B keeps the LightOnOCR-2-1B architecture, while the 0.8B and 4B adopt the Qwen3.5 vision-language architecture, which simplifies integration with existing tools and brings a significant speed-up. All models are released under the Apache 2.0 license for research and commercial use.
grounding prompt and every block comes back with a label and a bounding boxThe models can be used as before in a transcription-only mode: called with an empty prompt (""; the image only), they output all textual elements of the page as markdown. If you are currently using our previous models, switching to LightOnOCR-3 requires no change, as this is the default behavior.
The new usage mode is to call the models with the grounding prompt. They then output the new vision features alongside the transcribed text. Each block of content is prepended with a placeholder giving its type and its bounding box, in page coordinates normalized to 0β1000:
The placeholder label is one of:
Grounding adds about 25% output tokens over plain transcription (1,433 vs 1,158 tokens per page on average for the 4B). Other instructions are out of distribution: use the empty prompt ("") or grounding.
Note: LightOnOCR-3-1B shares the LightOnOCR-2 architecture and loads with the
LightOnOcrclasses available in Transformers since v5.
The LightOnOCR repository on GitHub provides a minimal client, CLI and viewer for the models served with vLLM, plus the code to reproduce our benchmarks.
Apache License 2.0
# Company report 2025
Revenue rose 20%.
A solar-powered factory.
<table> <tr><th>Year</th><th>Revenue</th></tr> <tr><td>2024</td><td>β¬10M</td></tr> <tr><td>2025</td><td>β¬12M</td></tr></table>uv pip install transformers pillow pypdfium2import torchfrom transformers import LightOnOcrForConditionalGeneration, LightOnOcrProcessor
model_id = "lightonai/LightOnOCR-3-1B"device = "mps" if torch.backends.mps.is_available() else "cuda" if torch.cuda.is_available() else "cpu"dtype = torch.float32 if device == "mps" else torch.bfloat16
model = LightOnOcrForConditionalGeneration.from_pretrained(model_id, dtype=dtype).to(device)processor = LightOnOcrProcessor.from_pretrained(model_id)
url = "https://huggingface.co/datasets/hf-internal-testing/fixtures_ocr/resolve/main/SROIE-receipt.jpeg"prompt = "grounding" # or "" for transcription-only
content = [{"type": "image", "url": url}]if prompt: content.append({"type": "text", "text": prompt})conversation = [{"role": "user", "content": content}]
inputs = processor.apply_chat_template( conversation, add_generation_prompt=True, tokenize=True, return_dict=True, return_tensors="pt",)inputs = {k: v.to(device=device, dtype=dtype) if v.is_floating_point() else v.to(device) for k, v in inputs.items()}
output_ids = model.generate(**inputs, max_new_tokens=1024)generated_ids = output_ids[0, inputs["input_ids"].shape[1]:]print(processor.decode(generated_ids, skip_special_tokens=True))vllm serve lightonai/LightOnOCR-3-1B \ --limit-mm-per-prompt '{"image": 1}' --mm-processor-cache-gb 0 --no-enable-prefix-cachingimport base64import io
import pypdfium2 as pdfiumimport requests
ENDPOINT = "http://localhost:8000/v1/chat/completions"MODEL = "lightonai/LightOnOCR-3-1B"PROMPT = "grounding" # or "" for transcription-only
# Render the first page of a PDF at 200 DPI (scale factor = 200/72 β 2.77)pdf = pdfium.PdfDocument(requests.get("https://arxiv.org/pdf/2412.13663").content)pil_image = pdf[0].render(scale=2.77).to_pil()
buffer = io.BytesIO()pil_image.save(buffer, format="PNG")image_base64 = base64.b64encode(buffer.getvalue()).decode("utf-8")
content = [{"type": "image_url", "image_url": {"url": f"data:image/png;base64,{image_base64}"}}]if PROMPT: content.append({"type": "text", "text": PROMPT})
payload = { "model": MODEL, "messages": [{"role": "user", "content": content}], "max_tokens": 4096, "temperature": 0.2, "top_p": 0.9,}
response = requests.post(ENDPOINT, json=payload)print(response.json()["choices"][0]["message"]["content"])@misc{lightonocr2_2026, title = {LightOnOCR: A 1B End-to-End Multilingual Vision-Language Model for State-of-the-Art OCR}, author = {Said Taghadouini and Adrien Cavaill\`{e}s and Baptiste Aubertin}, year = {2026}, howpublished = {\url{https://arxiv.org/abs/2601.14251}}}