# vLLM Semantic Router releases 27B open multimodal decision model d3-ultra

Digest AI · Generative AI & Models · published 2026-10-27T05:50:57Z

Canonical: https://digestai.news/story/vllm-semantic-router-releases-27b-open-multimodal-decision-model-d3-ul

## Summary

Unlike generative models, d3-ultra does not produce text but assigns probabilities to answers across multiple questions in a single input. It supports text, JSON, images, and videos, with a context window of **131,072 tokens** per question and a **0.46B-parameter vision encoder** included in its **26.09B total parameters**.

The model excels in text-based decision tasks, scoring **87.2** on the team’s **SR-Text** benchmark (chance-corrected accuracy), surpassing competitors like **GLiDE V1.2 (85.1)** and its sibling **d3-turbo (83.1)**. However, it underperforms in visual grounding (**58.2%** on **SR-Box**), trailing **d3-turbo (60.0%)**. Deployment options include **Hugging Face Transformers**, the **vLLM Semantic Router Engine**, a **free API at decision.vllm-sr.ai**, and a **demo on Hugging Face Space**. The team reports **304 ms latency** for a single photo question on an **AMD Instinct MI325X** GPU, with **2.16 seconds** for **255 questions**—**7.3 ms per additional question**—using **BF16 weights**. No quantized variants are listed yet.

## Key points

- vLLM Semantic Router released d3-ultra, a 27B open multimodal decision model under Apache-2.0
- Supports text, JSON, images, and videos with a 131,072-token context window and 0.46B vision encoder
- Scores 87.2 on SR-Text benchmark, but trails d3-turbo in visual grounding (58.2% vs 60.0%)

## Why it matters

d3-ultra enables developers to route, classify, and ground decisions in one API call without text generation, reducing latency for batch processing of up to 255 questions per second. Its open weights and strong text accuracy could accelerate automation in tools requiring probabilistic decision-making.

## Sources

1. [vLLM Semantic Router Releases d3-ultra: A 27B Open Multimodal Decision Model](https://marktechpost.com/2026/10/26/vllm-semantic-router-d3-ultra-27b-multimodal-decision-model) (MarkTechPost, 2026-10-27)

Part of the developing story: [vLLM Semantic Router Launches Open Multimodal Decision Models](https://digestai.news/thread/vllm-semantic-router-releases-decision-3-0-multimodal-models-with-5-sizes-under) (2 stories)

## Cite

Digest AI, "vLLM Semantic Router releases 27B open multimodal decision model d3-ultra", 27 October 2026, https://digestai.news/story/vllm-semantic-router-releases-27b-open-multimodal-decision-model-d3-ul

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