We started using Kiota recently for a new integration, but the OpenAPI definition for the API we were to interface with uses the v3.1 OpenAPI spec. When attempting to generate a client for this spec, we get the following error message:

crit: Kiota.Builder.KiotaBuilder[0]
      error generating the client: OpenAPI specification version '3.1.0' is not supported.

This forced us to down-convert the definition from v3.1 to v3.0 to be able to use Kiota to generate a C# client for it.

We'd like for Kiota to be able to handle OpenAPI v3.1 natively, so that we don't have to perform this extra, lossy conversion step. The conversion increases maintenance substantially for us, since now we cannot refer directly to the target API's OpenAPI definition, and instead, forces us to maintain a local converted definition file ourselves. Additionally, whenever the target API definition changes in any way, we are then required to perform the conversion step manually again and update our converted file, to only then be able to run Kiota on it again to generate the updated proxy.

For reference, this is the definition we are currently targeting (from SendGrid):

• https://raw.githubusercontent.com/sendgrid/sendgrid-oai/main/oas_v3.json