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vLLM Semantic Router v0.1 Iris: The First Major Release

· One min read
Xunzhuo Liu
Intelligent Routing @vLLM

We are thrilled to announce the release of vLLM Semantic Router v0.1, codename Iris—our first major release that marks a transformative milestone for intelligent LLM routing. Since our experimental launch in September 2025, we've witnessed extraordinary community growth: over 600 Pull Requests merged, 300+ Issues addressed, and contributions from more than 50 outstanding engineers worldwide.

In Greek mythology, Iris (Ἶρις) served as the divine messenger who bridged the realms of gods and mortals, traveling on the arc of the rainbow to deliver messages across vast distances. This symbolism perfectly captures what vLLM Semantic Router v0.1 achieves: a bridge between users and diverse AI models, intelligently routing requests across different LLM providers and architectures.

Synced from official vLLM Blog: vLLM Semantic Router v0.1 Iris: The First Major Release

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Semantic Router Q4 2025 Roadmap: Journey to Iris

· 15 min read
Xunzhuo Liu
Intelligent Routing @vLLM
Huamin Chen
Distinguished Engineer @ Red Hat
Chen Wang
Senior Staff Research Scientist @ IBM
Yue Zhu
Staff Research Scientist @ IBM

As we approach the end of 2025, we're excited to share our Q4 2025 roadmap for vLLM Semantic Router. This quarter marks a significant milestone in our project's evolution as we prepare for our first major release: v0.1, codename "Iris", expected in late 2025 to early 2026.

iris