diff --git a/aspnetcore/fundamentals/openapi/includes/overview6-8.md b/aspnetcore/fundamentals/openapi/includes/overview-6-8.md
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rename to aspnetcore/fundamentals/openapi/includes/overview-6-8.md
diff --git a/aspnetcore/fundamentals/openapi/includes/overview-9.md b/aspnetcore/fundamentals/openapi/includes/overview-9.md
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index 000000000000..75d83fc2dcc7
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+++ b/aspnetcore/fundamentals/openapi/includes/overview-9.md
@@ -0,0 +1,61 @@
+:::moniker range="aspnetcore-9.0"
+
+ASP.NET Core supports the generation of OpenAPI documents in controller-based and Minimal API apps.
+The [OpenAPI specification](https://spec.openapis.org/oas/latest.html) is a programming language-agnostic standard for documenting HTTP APIs. This standard is supported in ASP.NET Core apps through a combination of built-in APIs and open-source libraries. There are three key aspects to OpenAPI integration in an application:
+
+* Generating information about the endpoints in the app.
+* Gathering the information into a format that matches the OpenAPI schema.
+* Exposing the generated OpenAPI document via a visual UI or a serialized file.
+
+ASP.NET Core provides first-party support for generating information about endpoints in an app through the `Microsoft.AspNetCore.OpenApi` package.
+
+
+The following code is generated by the ASP.NET Core minimal web API template and uses OpenAPI:
+
+[!code-csharp[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs?name=snippet_default&highlight=5,9-12)]
+
+In the preceding highlighted code:
+
+* `AddOpenApi` registers services required for OpenAPI document generation into the application's DI container.
+* `MapOpenApi` adds an endpoint into the application for viewing the OpenAPI document serialized into JSON. The OpenAPI endpoint is restricted to the `Development` environment to minimize the risk of exposing sensitive information and reduce the vulnerabilities in production.
+
+<a name="openapinuget"></a>
+
+## `Microsoft.AspNetCore.OpenApi` NuGet package
+
+The [`Microsoft.AspNetCore.OpenApi`](https://www.nuget.org/packages/Microsoft.AspNetCore.OpenApi/) package provides the following features:
+
+* Support for generating OpenAPI documents at run time and accessing them via an endpoint on the application.
+* Support for "transformer" APIs that modify the generated document.
+
+To use the `Microsoft.AspNetCore.OpenApi` package, add it as a PackageReference to a project file:
+
+[!code-xml[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/projectFile.xml?highlight=15)]
+
+To learn more about the `Microsoft.AspNetCore.OpenApi` package, see <xref:fundamentals/openapi/aspnetcore-openapi>.
+
+## `Microsoft.Extensions.ApiDescription.Server` NuGet package
+
+The [`Microsoft.Extensions.ApiDescription.Server`](https://www.nuget.org/packages/Microsoft.Extensions.ApiDescription.Server/) package provides support for generating OpenAPI documents at build time and serializing them.
+
+To use `Microsoft.Extensions.ApiDescription.Server`, add it as a PackageReference to a project file.
+Document generation at build time is enabled by setting the `OpenApiGenerateDocuments` property.
+By default, the generated OpenAPI document is saved to the `obj` directory, but you can customize
+the output directory by setting the `OpenApiDocumentsDirectory` property.
+
+[!code-xml[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/projectFile.xml?highlight=9-12,16-19)]
+
+<!-- Include makes it trivial to move this anywhere in the doc OR add to other docs-->
+[!INCLUDE[](~/fundamentals/openapi/includes/api_endpoint_operation.md)]
+
+## ASP.NET Core OpenAPI source code on GitHub
+
+* [AddOpenApi](https://github.com/dotnet/aspnetcore/blob/main/src/OpenApi/src/Extensions/OpenApiServiceCollectionExtensions.cs)
+* [OpenApiDocumentService](https://github.com/dotnet/aspnetcore/blob/main/src/OpenApi/src/Services/OpenApiDocumentService.cs)
+* [OpenApiOptions](https://github.com/dotnet/aspnetcore/blob/main/src/OpenApi/src/Services/OpenApiOptions.cs)
+
+## Additional Resources
+
+* <xref:fundamentals/minimal-apis/security>
+
+:::moniker-end
diff --git a/aspnetcore/fundamentals/openapi/overview.md b/aspnetcore/fundamentals/openapi/overview.md
index dd1df67c8223..66e941e5b641 100644
--- a/aspnetcore/fundamentals/openapi/overview.md
+++ b/aspnetcore/fundamentals/openapi/overview.md
@@ -1,32 +1,32 @@
 ---
 title: Overview of OpenAPI support in ASP.NET Core API apps
+ai-usage: ai-assisted
 author: wadepickett
-description: Learn about OpenAPI features in ASP.NET Core.
-ms.author: wpickett
+description: Learn how to integrate OpenAPI in ASP.NET Core API apps. Discover features, tools, and packages for generating and customizing OpenAPI documents.
 monikerRange: '>= aspnetcore-6.0'
-ms.date: 05/14/2025
+ms.author: wpickett
+ms.reviewer: wpickett
+ms.date: 03/20/2026
 uid: fundamentals/openapi/overview
 ---
 # OpenAPI support in ASP.NET Core API apps
 
 [!INCLUDE[](~/includes/not-latest-version.md)]
 
-:::moniker range=">= aspnetcore-9.0"
+:::moniker range=">= aspnetcore-10.0"
 
-ASP.NET Core supports the generation of OpenAPI documents in controller-based and Minimal APIs apps.
-The [OpenAPI specification](https://spec.openapis.org/oas/latest.html) is a programming language-agnostic standard for documenting HTTP APIs. This standard is supported in ASP.NET Core apps through a combination of built-in APIs and open-source libraries. There are three key aspects to OpenAPI integration in an application:
+ASP.NET Core supports the generation of OpenAPI documents in controller-based and Minimal API apps.
+The [OpenAPI specification](https://spec.openapis.org/oas/latest.html) is a programming language-agnostic standard for documenting HTTP APIs. ASP.NET Core apps support this standard through a combination of built-in APIs and open-source libraries. There are three key aspects to OpenAPI integration in an application:
 
 * Generating information about the endpoints in the app.
 * Gathering the information into a format that matches the OpenAPI schema.
-* Exposing the generated OpenAPI document via a visual UI or a serialized file.
-
-ASP.NET Core apps provide built-in support for generating information about endpoints in an app via the `Microsoft.AspNetCore.OpenApi` package.
+* Exposing the generated OpenAPI document through a visual UI or a serialized file.
 
-<!-- TODO: Merge content from controllers overview here, as appropriate -->
+ASP.NET Core provides first-party support for generating information about endpoints in an app through the `Microsoft.AspNetCore.OpenApi` package.
 
-The following code is generated by the ASP.NET Core minimal web API template and uses OpenAPI:
+The ASP.NET Core minimal web API template generates the following code that uses OpenAPI:
 
-[!code-csharp[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs?name=snippet_default&highlight=5,9-12)]
+[!code-csharp[](~/fundamentals/openapi/samples/10.x/WebMinOpenApi/Program.cs?name=snippet_default&highlight=5,9-12)]
 
 In the preceding highlighted code:
 
@@ -39,25 +39,25 @@ In the preceding highlighted code:
 
 The [`Microsoft.AspNetCore.OpenApi`](https://www.nuget.org/packages/Microsoft.AspNetCore.OpenApi/) package provides the following features:
 
-* Support for generating OpenAPI documents at run time and accessing them via an endpoint on the application.
-* Support for "transformer" APIs that allow modifying the generated document.
+* Support for generating OpenAPI documents at runtime and accessing them through an endpoint on the application.
+* Support for "transformer" APIs that modify the generated document.
 
 To use the `Microsoft.AspNetCore.OpenApi` package, add it as a PackageReference to a project file:
 
-[!code-xml[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/projectFile.xml?highlight=15)]
+[!code-xml[](~/fundamentals/openapi/samples/10.x/WebMinOpenApi/projectFile.xml?highlight=15)]
 
 To learn more about the `Microsoft.AspNetCore.OpenApi` package, see <xref:fundamentals/openapi/aspnetcore-openapi>.
 
 ## `Microsoft.Extensions.ApiDescription.Server` NuGet package
 
-The [`Microsoft.Extensions.ApiDescription.Server`](https://www.nuget.org/packages/Microsoft.Extensions.ApiDescription.Server/) package provides support for generating OpenAPI documents at build time and serializing them.
+The [`Microsoft.Extensions.ApiDescription.Server`](https://www.nuget.org/packages/Microsoft.Extensions.ApiDescription.Server/) package supports generating OpenAPI documents at build time and serializing them.
 
 To use `Microsoft.Extensions.ApiDescription.Server`, add it as a PackageReference to a project file.
-Document generation at build time is enabled by setting the `OpenApiGenerateDocuments` property.
+Enable document generation at build time by setting the `OpenApiGenerateDocuments` property.
 By default, the generated OpenAPI document is saved to the `obj` directory, but you can customize
 the output directory by setting the `OpenApiDocumentsDirectory` property.
 
-[!code-xml[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/projectFile.xml?highlight=9-12,16-19)]
+[!code-xml[](~/fundamentals/openapi/samples/10.x/WebMinOpenApi/projectFile.xml?highlight=9-12,16-19)]
 
 <!-- Include makes it trivial to move this anywhere in the doc OR add to other docs-->
 [!INCLUDE[](~/fundamentals/openapi/includes/api_endpoint_operation.md)]
@@ -74,4 +74,5 @@ the output directory by setting the `OpenApiDocumentsDirectory` property.
 
 :::moniker-end
 
-[!INCLUDE[](~/fundamentals/openapi/includes/overview6-8.md)]
+[!INCLUDE[](~/fundamentals/openapi/includes/overview-6-8.md)]
+[!INCLUDE[](~/fundamentals/openapi/includes/overview-9.md)]