Catalogue / OpenRouter / Google: Gemini 3.1 Pro Preview (sold by OpenRouter)

Google: Gemini 3.1 Pro Preview (sold by OpenRouter)

Prices and limits, each value carrying the date it was observed and the source it came from.

What does Gemini 3.1 Pro Preview cost?

Does the price change with the hour or the size of the request?

Yes. This provider publishes conditional rates, so the figure above is not the only price you can pay. Each rate below applies under a stated condition, taken verbatim from the provider's own catalogue.

We record each conditional rate as its own dated observation, so a discount window that disappears shows up as a change like any other.

How reliable is each host behind Gemini 3.1 Pro Preview?

The cheapest offer is not a bargain if it is down. OpenRouter routes traffic to several upstream hosts for this model and publishes the availability its own router recorded over the last day for each of them. Least reliable first.

This is availability as OpenRouter's router observed it, not as you would measure it calling the host directly: the network path is not the same. We read it once a day and keep every reading, so a host that was unreliable last August can still be shown to have been unreliable last August.

We publish no time to first token and no throughput. OpenRouter's API carries fields for both and leaves them empty on every endpoint we have read, and we will not fill a number the source does not give.

How has Gemini 3.1 Pro Preview moved?

How capable is Gemini 3.1 Pro Preview?

These indices are produced by Artificial Analysis and relayed through the catalogue API. They are not our own measurement. See cost per point of capability to compare them against price.

Has Gemini 3.1 Pro Preview changed price?

No change has been recorded since we started observing this service on 25 August 2026. We record a change only when two successive observations differ, so an empty table here means the values have held.

Other services from OpenRouter

• Google: Gemini 3.1 Flash Lite
• Google: Gemini 3.1 Flash Lite Preview
• Google: Gemini 3.1 Pro Preview (batch)
• Google: Gemini 3.1 Pro Preview Custom Tools
• Google: Gemini 3.5 Flash (batch)
• Google: Gemini 3.5 Flash

All OpenRouter services

Where these figures come from

Source: OpenRouter. Every figure on this page was read from OpenRouter's own published price list, and every row above links straight back to it. We publish factual values with attribution, we do not reproduce OpenRouter's content, and we send readers to them. If you publish this source and want us to stop tracking it, write to contact@bertrande.com and we will act on it without argument.

How is this page verified?

Every figure above comes from OpenRouter's own published price list, which we rank as a level 1 source. We re-check it every 6 hours. Each observation stores the exact source URL and a SHA-256 fingerprint of the source content at that moment, which is what lets us prove what the source said on a given day.

The Proof column shows the first twelve characters of the SHA-256 fingerprint of the source content at the moment we read it. Hover it for the full value. It is what lets us demonstrate later what the source said on a given day, after that page has changed or vanished. The full fingerprints are in data.json.

No value on this page was produced, estimated or completed by a language model. Where we do not have a verified figure, the row is absent rather than filled in. Read the full methodology, or report an error.

Take the data, or watch this page

This page is available as data.json (including the full observation history of every parameter) and data.csv, under CC-BY-4.0, free, with attribution. See all downloads.