> For the complete documentation index, see [llms.txt](https://inferra.gitbook.io/inferra-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://inferra.gitbook.io/inferra-docs/the-ecosystem/the-gpu-hour-index.md).
# The GPU-hour index
The Inferra Index is a live price for one hour of GPU time, quoted in dollars, for each GPU model. It is the number a renter pays on the marketplace and the number a trader takes a view on. Because both sides read the same price, trading the index is how the market discovers what an hour of compute is really worth.
### What it measures
For each model, the index tracks the going rate to rent one card by the hour, on demand, right now. It looks at what compute actually clears at, not headline "from $X" teasers, and it normalizes multi-card machines down to a single card so every model is comparable.
There is one price per model, and it moves as the rental market moves.
### The models
Inferra prices six GPU tiers.
| Tier | Card |
|---|
| A5000 | RTX A5000, 24GB |
| A100 | A100 80GB SXM |
| H100 | H100 80GB SXM |
| H200 | H200 141GB SXM |
| MI300X | MI300X 192GB |
| B200 | B200 180GB |
### How the price is built
The index blends live rental prices from the open market with Inferra's own settled trades, so it reflects both what the wider market charges and what compute actually changes hands for on Inferra.
* **Real market rates** are the main input, drawn from the liquid on-demand rental market.
* **Inferra's own volume** contributes what compute has recently settled at on the platform. Its weight is capped at 20%, so the index can never be driven by Inferra's own flow. The measurement leads the market rather than following its own book.
* **Outliers are filtered out** before anything is blended, so a single strange quote cannot move the price. The result is smoothed over time, so the price tracks the trend rather than every twitch.
If the market goes thin and there is not enough real data to trust, the price holds at its last good value rather than printing a number that is not there.
### Why it matters
The index is not a detached benchmark. It is the price a renter pays to provision a machine and the price a trader prices a position against. Real demand for compute anchors it, and trading it feeds back into what the next buyer pays. That is what makes it price discovery for compute, rather than a rate card someone sets by hand.
The price is a public good in its own right. A provider can price against it, a buyer can check it, and a builder can read it. Perpetuals and futures settle against it. See [Perpetuals and futures](/inferra-docs/inferra-terminal/perpetuals-and-futures.md) for how positions are marked, and [Renting compute](/inferra-docs/inferra-cloud/renting-compute.md) for how it sets the rental rate.
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