Cursor with a separate provider key

A custom provider in Cursor changes where supported model requests go. It does not necessarily replace Cursor’s subscription, unlock every editor feature, or make every model work identically. The useful comparison is between two routes inside the same editor: Cursor-managed model access and requests sent through your own OpenAI-compatible endpoint.

Vana API fits the second route. It provides one endpoint at https://api.vanaapi.com, with OpenAI-compatible access alongside Anthropic Messages and Gemini native protocols. For Cursor’s OpenAI-compatible configuration, that first protocol is the relevant one.

§ Connection: managed access and a custom endpoint

Cursor-managed access: You select an available model through Cursor and use the access included in your account. Cursor handles the provider connection. There is no separate upstream API key or base URL to maintain.

Custom provider: You supply a provider key and configure Cursor’s OpenAI-compatible base URL setting, where available. Setting labels and supported workflows can change between Cursor releases, so check your installed version rather than following screenshots literally.

With Vana API, use the base URL specified in its current OpenAI-compatible setup instructions. The service origin is https://api.vanaapi.com; do not confuse that origin with a complete request path. Check whether the configured base requires a version suffix, and avoid entering a full chat-completions URL into a field that expects a base URL.

§ Model selection: names and request identifiers

Cursor-managed access: The model picker reflects Cursor’s current catalog and account permissions. Availability is determined by Cursor, not by a separate provider balance.

Custom provider: The selected model must also be accepted by the endpoint. A readable name such as Claude Sonnet 5.5 or Gemini 3.1 Pro is not necessarily the exact identifier to put into a custom model field. Copy the request identifier from Vana API’s current model listing, then confirm Cursor can select it.

OpenAI compatibility describes a request interface, not identical behavior across models. Context limits, tool calls, structured responses, and streaming can differ. A successful short chat establishes basic connectivity; it does not establish full coding-agent compatibility.

§ Editor features: access is not equivalence

Cursor-managed access: Cursor controls how its supported models connect to editor features and how those features consume your plan’s allowances.

Custom provider: Only workflows that Cursor permits to use your key and overridden endpoint can take that route. Do not assume autocomplete, background work, or every agent action will use the custom provider. Some capabilities may still require Cursor-managed infrastructure or an eligible Cursor plan.

Vana API’s support for multiple protocols does not change those editor-side boundaries. It is useful for other clients, but a native protocol is not automatically available through Cursor’s OpenAI-compatible settings.

§ Billing: two accounts to distinguish

Cursor-managed access: Usage follows Cursor’s current subscription terms, included allowances, and any applicable additional charges.

Custom provider: Vana API bills per real token with no monthly fee. That provider billing is separate from any Cursor subscription you retain. Compare the combined cost, not just a model’s advertised token rate.

A short instruction can trigger substantial usage when the editor includes files, prior messages, and tool results. Evaluate several representative tasks and inspect reported usage before deciding which route is more economical.

§ A small test before regular work

Create a Vana API account if you want to test this route, then keep the initial trial narrow:

• Save your existing Cursor settings before changing the key or endpoint.
• Use a dedicated provider key and keep it out of repository files.
• Start with a non-sensitive prompt in a disposable project.
• Test streaming, a file edit, and a tool-using task separately.
• Check both provider usage records and Cursor’s account usage.

Finally, review both services’ data-handling terms before sending private code. A custom endpoint changes the request destination for supported calls; it is not proof that the editor is bypassed. Keep the managed route available until the custom route has passed the tasks you actually rely on.