Upscale's Token Fabric manages two switch silicon families from one SONiC-based OS

In Token Fabric, "one software layer" means one network operating system. According to the dev.to account of the launch, SkyOS runs on both fabrics, is based on the open-source SONiC platform, and is tuned for AI protocols ^[6]. The data planes under it stay distinct. Inside the rack, scale-up traffic uses Ethernet for Scale-Up Networking alongside standard IP. Between racks, scale-out traffic uses standard Ethernet with RoCE to carry remote direct memory access ^[9]. Each half runs on a different company's silicon ^[2].

So the hard engineering sits in the OS. It has to drive Upscale's own scale-up chip and Nvidia's scale-out chip and present both the same way. The account says SkyOS abstracts the underlying hardware ^[11]. It also lists Upscale's SONiC contributions and its extensions to the Switch Abstraction Interface ^[10]. Those SAI extensions are the first thing I would ask to see in an evaluation. I'd expect any difference in how SkyOS treats the two chips to show up there.

The protocol choices are conservative, and I think that is correct. Upscale says it is extending existing protocols, and that the approach eases integration into existing data centers ^[8]. SkyFabriX is designed to accommodate evolving standards such as Ultra Accelerator Link ^[3]. Upscale also works with the Ultra Ethernet Consortium and the UALink groups ^[12].

The 115.2 Tbps switch capacity and the 400G, 800G and 1.6T scale-out speeds are vendor specs for parts ^[4][19]. A part spec predicts cluster behaviour only if a planner also knows how big the scale-up domains are and how traffic behaves when it crosses from one fabric to the other. The trays come in custom and standard rack form factors and pool GPUs and other accelerators into large scale-up domains ^[5]. The account does not give domain sizes, latency, job-completion times or prices.

Upscale is based in Santa Clara and came out of stealth in September 2025 with a $100 million seed round ^[14]. In June it raised $190 million and outlined SkyHammer, its custom scale-up switch chip, which SkyFabriX is built on ^[15]. Those two rounds total $290 million ^[21]. The account puts total capital at about $500 million ^[17]. That leaves roughly $210 million outside the rounds it names ^[22]. The company has more than 300 employees ^[17]. As the account paraphrases him, chief executive Barun Kar argues that compute is ramping quickly while networking has lagged ^[18].

Upscale's starting premise is that a single AI job spans both fabrics ^[1]. The test I would run before 2027 is that job, with scale-up and scale-out behaviour read from the same SkyCMD view ^[7].