Molmo2

Molmo2 is a family of open vision-language models developed by the Allen Institute for AI (Ai2) that support image, video and multi-image understanding and grounding. Molmo2 models are trained on publicly available third party datasets as referenced in our technical report and Molmo2 data, a collection of datasets with highly-curated image-text and video-text pairs. It has state-of-the-art performance among multimodal models with a similar size. You can find all models in the Molmo2 family here.

Learn more about the Molmo2 family in our announcement blog post.

Molmo2-8B is based on Qwen3-8B and uses SigLIP 2 as vision backbone. It outperforms others in the class of open weight and data models on short videos, counting, and captioning, and is competitive on long-videos.

Ai2 is commited to open science. The Molmo2 datasets are available here. All other artifacts used in creating Molmo2 (training code, evaluations, intermediate checkpoints) will be made available at a later date, furthering our commitment to open-source AI development and reproducibility.

Quick links:

• 💬 Demo
• 📂 All Models
• 📃 Paper
• 🎥 Blog with Videos

Quick Start

Setup Conda Environment

conda create --name transformers4571 python=3.11
conda activate transformers4571
pip install transformers==4.57.1
pip install torch pillow einops torchvision accelerate decord2 molmo_utils

General Video QA

from transformers import AutoProcessor, AutoModelForImageTextToText
import torch

model_id="allenai/Molmo2-8B"

# load the processor
processor = AutoProcessor.from_pretrained(
    model_id,
    trust_remote_code=True,
    dtype="auto",
    device_map="auto"
)

# load the model
model = AutoModelForImageTextToText.from_pretrained(
     model_id,
     trust_remote_code=True,
     dtype="auto",
     device_map="auto"
)

# process the video and text
messages = [
    {
        "role": "user",
        "content": [
            dict(type="text", text="Which animal appears in the video?"),
            dict(type="video", video="https://storage.googleapis.com/oe-training-public/demo_videos/many_penguins.mp4"),
        ],
    }
]

inputs = processor.apply_chat_template(
    messages,
    tokenize=True,
    add_generation_prompt=True,
    return_tensors="pt",
    return_dict=True,
)

inputs = {k: v.to(model.device) for k, v in inputs.items()}

# generate output
with torch.inference_mode():
    generated_ids = model.generate(**inputs, max_new_tokens=2048)

# only get generated tokens; decode them to text
generated_tokens = generated_ids[0, inputs['input_ids'].size(1):]
generated_text = processor.tokenizer.decode(generated_tokens, skip_special_tokens=True)

# print the generated text
print(generated_text)

# >>>  Penguins appear in the video.

Pointing Video QA

from transformers import AutoProcessor, AutoModelForImageTextToText
import torch
from molmo_utils import process_vision_info
import re

model_id="allenai/Molmo2-8B"

# load the processor
processor = AutoProcessor.from_pretrained(
    model_id,
    trust_remote_code=True,
    dtype="auto",
    device_map="auto"
)

# load the model
model = AutoModelForImageTextToText.from_pretrained(
    model_id,
    trust_remote_code=True,
    dtype="auto",
    device_map="auto"
)

COORD_REGEX = re.compile(rf"")
FRAME_REGEX = re.compile(rf"(?:^|\t|:|,|;)([0-9\.]+) ([0-9\. ]+)")
POINTS_REGEX = re.compile(r"([0-9]+) ([0-9]{3,4}) ([0-9]{3,4})")

def _points_from_num_str(text, image_w, image_h, extract_ids=False):
    all_points = []
    for points in POINTS_REGEX.finditer(text):
        ix, x, y = points.group(1), points.group(2), points.group(3)
        # our points format assume coordinates are scaled by 1000
        x, y = float(x)/1000*image_w, float(y)/1000*image_h
        if 0 <= x <= image_w and 0 <= y <= image_h:
            yield ix, x, y

def extract_video_points(text, image_w, image_h, extract_ids=False):
    """Extract video pointing coordinates as a flattened list of (t, x, y) triplets from model output text."""
    all_points = []
    for coord in COORD_REGEX.finditer(text):
        for point_grp in FRAME_REGEX.finditer(coord.group(1)):
            frame_id = float(point_grp.group(1))
            w, h = (image_w, image_h)
            for idx, x, y in _points_from_num_str(point_grp.group(2), w, h):
                if extract_ids:
                    all_points.append((frame_id, idx, x, y))
                else:
                    all_points.append((frame_id, x, y))
    return all_points

messages = [
    {
        "role": "user",
        "content": [
            dict(type="text", text="Point to the penguins."),
            dict(type="video", video="https://storage.googleapis.com/oe-training-public/demo_videos/many_penguins.mp4"),
        ],
    }
]

# process the video using `molmo_utils.process_vision_info`
_, videos, video_kwargs = process_vision_info(messages)
videos, video_metadatas = zip(*videos)
videos, video_metadatas = list(videos), list(video_metadatas)

# apply the chat template to the input messages
text = processor.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)

# process the video and text
inputs = processor(
    videos=videos,
    video_metadata=video_metadatas,
    text=text,
    padding=True,
    return_tensors="pt",
    **video_kwargs,
)

inputs = {k: v.to(model.device) for k, v in inputs.items()}

# generate output
with torch.inference_mode():
    generated_ids = model.generate(**inputs, max_new_tokens=