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Cursor exposes an Override OpenAI Base URL setting, so you can route its chat and agent requests to Prism. Cursor sends these requests through its own backend for prompt building, so this is a bring-your-own-key setup rather than a direct connection. If you have no key, create one at prisminference.com/signup first.

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Configure

1

Open model settings

Open Cursor Settings (Cmd + , on macOS, Ctrl + , elsewhere) and go to Models.
2

Set the OpenAI API key

In the API Keys section, turn on OpenAI API Key and paste your Prism API key. Cursor sends this key to whichever base URL you configure, even though it is labeled OpenAI.
3

Override the base URL

Turn on Override OpenAI Base URL and set it to:
4

Add the Prism models

In the Models section, click + Add model and add each Prism model ID:
  • deepseek-v4.1-flash
  • deepseek-v4-flash
Make sure both are toggled on. Send the bare model ID on the wire; do not prefix it with a provider name.
5

Select a model

Open the model picker in chat or the agent panel and select deepseek-v4.1-flash.

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Notes

  • The override applies to every model that uses your key, so turn it off to switch back to Cursor’s hosted models.
  • Tab completion always uses Cursor’s built-in models and does not use Prism.
  • Avoid custom names that resemble a native Cursor model; Cursor may route those back through its own servers.
  • Prism discards request inputs and outputs after processing. See Zero data retention.

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Verify

Send a short prompt in a new chat and confirm the response arrives. The request should appear in your Prism usage once it completes.
Last modified on September 24, 2026