Now in Foundry: Microsoft Harrier and NVIDIA EGM-8B

This week's Model Mondays edition highlights three models that share a common thread: each achieves results comparable to larger leading models, as a result of targeted training strategies rather than scale. Microsoft Research's harrier-oss-v1-0.6b from achieves state-of-the-art results on the Multilingual MTEB v2 embedding benchmark at 0.6B parameters through contrastive learning and knowledge distillation. NVIDIA's EGM-8B scores 91.4 average IoU on the RefCOCO visual grounding benchmark by training a small Vision Language Model (VLM) with reinforcement learning to match the output quality of much larger models.

Together they represent a practical argument for efficiency-first model development: the gap between small and large models continues to narrow when training methodology is the focus rather than parameter count alone.

Models of the week

Microsoft Research: harrier-oss-v1-0.6b

Model Specs

• Parameters / size: 0.6B
• Context length: 32,768 tokens
• Primary task: Text embeddings (retrieval, semantic similarity, classification, clustering, reranking)

Why it's interesting

• State-of-the-art on Multilingual MTEB v2 from Microsoft Research: harrier-oss-v1-0.6b is a new embedding model released by Microsoft Research, achieving a 69.0 score on the Multilingual MTEB v2 (Massive Text Embedding Benchmark) leaderboard—placing it at the top of its size class at release. It is part of the harrier-oss family spanning harrier-oss-v1-270m (66.5 MTEB v2), harrier-oss-v1-0.6b (69.0), and harrier-oss-v1-27b (74.3), with the 0.6B variant further trained with knowledge distillation from the larger family members. Benchmarks: Multilingual MTEB v2 Leaderboard.
• Decoder-only architecture with task-instruction queries: Unlike most embedding models that use encoder-only transformers, harrier-oss-v1-0.6b uses a decoder-only architecture with last-token pooling and L2 normalization. Queries are prefixed with a one-sentence task instruction (e.g., "Instruct: Retrieve relevant passages that answer the query\nQuery: ...") while documents are encoded without instructions—allowing the same deployed model to be specialized for retrieval, classification, or similarity tasks through the prompt alone.
• Broad task coverage across six embedding scenarios: The model is trained and evaluated on retrieval, clustering, semantic similarity, classification, bitext mining, and reranking—making it suitable as a general embedding backbone for multi-task pipelines rather than a single-use retrieval model. One endpoint, consistent embeddings across the stack.
• 100+ language support: Trained on a large-scale mixture of multilingual data covering Arabic, Chinese, Japanese, Korean, and 100+ additional languages, with strong cross-lingual transfer for tasks that span language boundaries.

Try it

Sample prompt for a global enterprise knowledge base deployment:

You are building a multilingual internal knowledge base for a global professional services firm. Using the harrier-oss-v1-0.6b endpoint deployed in Microsoft Foundry, encode all internal documents—policy guides, project case studies, and technical documentation—across English, French, German, and Japanese. At query time, prepend the task instruction to each employee query: "Instruct: Retrieve relevant internal documents that answer the employee's question\nQuery: {question}". Retrieve the top-5 most similar documents by cosine similarity and pass them to a language model with the instruction: "Using only the provided documents, answer the question and cite the source document title for each claim. If no document addresses the question, say so."

NVIDIA: EGM-8B

Model Specs

• Parameters / size: ~8.8B
• Context length: 262,144 tokens
• Primary task: Image-text-to-text (visual grounding)

Why it's interesting

• Preforms well on visual grounding compared to larger models even at its small size: EGM-8B achieves 91.4 average Intersection over Union (IoU) on the RefCOCO benchmark—the standard measure of how accurately a model localizes a described region within an image. Compared to its base model Qwen3-VL-8B-Thinking (87.8 IoU), EGM-8B achieves a +3.6 IoU gain through targeted Reinforcement Learning (RL) fine-tuning. Benchmarks: EGM Project Page.
• 5.9x faster than larger models at inference: EGM-8B achieves 737ms average latency. The research demonstrates that test-time compute can be scaled horizontally across small models—generating many medium-quality responses and selecting the best—rather than relying on a single expensive forward pass through a large model.
• Two-stage training: EGM-8B is trained first with Supervised Fine-Tuning (SFT) on detailed chain-of-thought reasoning traces generated by a proprietary VLM, then refined with Group Relative Policy Optimization (GRPO) using a reward function combining IoU accuracy and task success. The intermediate SFT checkpoint is available as nvidia/EGM-8B-SFT for developers who want to experiment with the intermediate stage.
• Addresses a root cause of small model grounding errors: The EGM research identifies that 62.8% of small model errors on visual grounding stem from complex multi-relational descriptions—where a model must reason about spatial relationships, attributes, and context simultaneously. By focusing test-time compute on reasoning through these complex prompts, EGM-8B closes the gap without increasing the underlying model size.

Try it

Sample prompt for a retail and logistics deployment:

You are building a visual inspection system for a logistics warehouse. Using the EGM-8B endpoint deployed in Microsoft Foundry, submit each incoming package scan image along with a natural language grounding query describing the region of interest: "Please provide the bounding box coordinate of the region this sentence describes: {description}". For example: "the label on the upper-left side of the box", "the barcode on the bottom face", or "the damaged corner on the right side". Use the returned bounding box coordinates to route each package to the appropriate inspection station based on the identified region.

Getting started

You can deploy open-source Hugging Face models directly in Microsoft Foundry by browsing the Hugging Face collection in the Foundry model catalog and deploying to managed endpoints in just a few clicks. You can also start from the Hugging Face Hub. First, select any supported model and then choose "Deploy on Microsoft Foundry", which brings you straight into Azure with secure, scalable inference already configured. Learn how to discover models and deploy them using Microsoft Foundry documentation:

• Follow along the Model Mondays series and access the GitHub to stay up to date on the latest
• Read Hugging Face on Azure docs
• Learn about one-click deployments from the Hugging Face Hub on Microsoft Foundry
• Explore models in Microsoft Foundry