B300s are starting to look like cloud instances, not mythical hardware

For a while, talking about renting B300s felt a bit like talking about getting a table at a restaurant that didn’t take bookings: technically possible, but good luck when you actually wanted one.

That picture is changing. As of 4 November, multiple providers list NVIDIA HGX B300 capacity with public pricing. Nebius lists on-demand B300 at $9.50 per GPU-hour, plus preemptible capacity from $0.99 per GPU-hour. CoreWeave lists an eight-GPU HGX B300 spot instance at $35.84 per hour, or about $4.48 per GPU-hour for that spot configuration.

Those aren’t just “contact sales for a custom cluster” pages. A public per-hour price and a spot or preemptible option mean B300s are showing up in the normal cloud-compute menu. For a team that wants to run an experiment, that changes the conversation: you can at least price a short job and see whether the hardware is reachable.

More visible supply, still a very expensive GPU

The pricing also makes the catch obvious. A full eight-GPU spot node at CoreWeave is still around $35.84 an hour, and the cheapest Nebius rate is preemptible, so it can be interrupted. Nebius’s on-demand figure is still $9.50 per GPU-hour. This is accessible compared with waiting for a custom allocation, but it is not casual laptop money.

And a published price is not a live inventory guarantee. It doesn’t tell us how many nodes are free in a specific region right now, whether a long run will keep its capacity, or whether you can reserve a large cluster next week. “Available to rent” and “available in the exact size and window I need” are different claims.

What seems to have changed

My read is that B300 supply has moved from mostly strategic, bespoke allocations toward visible, rentable capacity across multiple providers. That’s a meaningful change for smaller labs and engineering teams. It makes trying the hardware practical without negotiating a whole datacentre deployment first.

The next useful signal isn’t another announcement that a provider supports B300. It’s what happens when people actually try to launch jobs: which regions provision immediately, how often spot capacity gets interrupted, and whether prices fall as supply grows. For now, the hardware is a lot less mythical. It is still scarce enough to command a premium.

Provider prices are live and can change. I checked the linked pricing pages on 4 November 2026; they show advertised rates, not guaranteed stock.