Does AWS API Gateway support OpenAPI 3.0?

AWS API Gateway supports OpenAPI 3.0 since September 27, 2018, both during API import and export:

https://aws.amazon.com/about-aws/whats-new/2018/09/amazon-api-gateway-adds-support-for-openapi-3-api-specification/

There is a list of tooling that is being built for V3 here https://github.com/OAI/OpenAPI-Specification/blob/master/IMPLEMENTATIONS.md

To my knowledge AWS don't have anything yet. Also, they are one of the few large tech companies that haven't joined the OAI. https://www.openapis.org/membership/members