System Duo
System Duo is AI that decides in a blink and reasons in depth. vLLM Semantic Router works with any model, open or closed.. It is ranked #576 on the Dev Radar, in AI dev tools, first seen 3 h ago and shared in 1 post (1.4k views).
System Duo · Thinking, fast and slow. Skip to content , System Duo home Menu System Duo Thinking, fast and slow . AI that decides in a blink and reasons in depth. Get your free API key Creating your key Key created Install for DeepSeek Harness Research use only · Terms · Privacy Creating a key here needs JavaScript. Create one from a terminal . Your API key Manage keys (opens in a new tab) Copy Copied Save it now: it is shown only once. Your first calls System One System Two curl -s https://app.vllm-sr.ai/v1/systemone \ -H "Authorization: Bearer $VLLM_SR_API_KEY" \ -H "Content-Type: application/json" \ -d '{"model": "vllm-sr/d3-ultra",…
What people said about System Duo on X
One router, two minds 🧠⚡ Huge work from @XunzhuoLiu and the vLLM Semantic Router team on System Duo — fast decision models handle the blink-of-an-eye calls (triage, guard, verify, check), while the router sends deep reasoning to the right model only when it matters. All open source, all running on vLLM →…
— @vllm_project, 3 h ago · 11 likes · see the post
Alternatives to System Duo
- ricursive.com — Ripple-65B Preview: U.S. Open-Weight SOTA on Agentic Coding
- Plugin Catalog — Open a pull request that adds your plugin to the Hermes plugin catalog
- strata — Strata: how it works
- flashprove — Further progress in provable inference will likely be an important part of improving trust in AI deployment. To that…
- niklaslenz.com — Play the world in your browser. Every number, the exact command and the raw output
- kimi-k3.1-pro — Releasing the model weights of Kimi K3.1 Pro
System Duo in numbers
- Rank on the Dev Radar: #576 of 9435
- Shared in 1 post by 1 account: @vllm_project
- 1.4k views on those posts
- First seen 3 h ago, last shared 3 h ago
- Pricing seen by AGK Intelligence: open source
- Market: AI dev tools
FAQ
What is System Duo?
AI that decides in a blink and reasons in depth. vLLM Semantic Router works with any model, open or closed. It was first shared on X 3 h ago and is ranked #576 on the Dev Radar.
Is System Duo free?
It is open source.
Who shared System Duo?
1 account on X, including @vllm_project, in 1 post totalling 1.4k views.
Every post is read and classified by AGK Intelligence: what it is, which market it belongs to, and whether the link is a real tool. 31.9k posts from 5k X accounts over the last 21 days, 9.4k tools, 12 markets. New posts are collected several times an hour and the full ranking is recomputed every hour — last update 2026-11-06 03:02 UTC. Full method.