diff --git a/FirebaseVertexAI/Sources/APIVersion.swift b/FirebaseVertexAI/Sources/APIVersion.swift
index 44619e0efbd..640f2b947d9 100644
--- a/FirebaseVertexAI/Sources/APIVersion.swift
+++ b/FirebaseVertexAI/Sources/APIVersion.swift
@@ -13,16 +13,13 @@
 // limitations under the License.
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
-public struct APIVersion: ExpressibleByStringLiteral {
-  public static let v1 = APIVersion("v1")
-  public static let v1beta = APIVersion("v1beta")
+public struct APIVersion {
+  public static let v1 = APIVersion(versionIdentifier: "v1")
+  public static let v1beta = APIVersion(versionIdentifier: "v1beta")
 
   let versionIdentifier: String
 
-  public init(stringLiteral versionIdentifier: String) {
-    guard !versionIdentifier.isEmpty else {
-      fatalError("The API version identifier must not be empty.")
-    }
+  init(versionIdentifier: String) {
     self.versionIdentifier = versionIdentifier
   }
 }
diff --git a/FirebaseVertexAI/Sources/GenerativeAIRequest.swift b/FirebaseVertexAI/Sources/GenerativeAIRequest.swift
index 25f87c09a7d..e00d6c2974d 100644
--- a/FirebaseVertexAI/Sources/GenerativeAIRequest.swift
+++ b/FirebaseVertexAI/Sources/GenerativeAIRequest.swift
@@ -36,7 +36,8 @@ public struct RequestOptions {
   /// Initializes a request options object.
   ///
   /// - Parameters:
-  ///   - timeout The request’s timeout interval in seconds; defaults to 180 seconds.
+  ///   - timeout: The request’s timeout interval in seconds; defaults to 180 seconds.
+  ///   - apiVersion: The API version to use in requests to the backend; defaults to v1beta.
   public init(timeout: TimeInterval = 180.0, apiVersion: APIVersion = .v1beta) {
     self.timeout = timeout
     self.apiVersion = apiVersion.versionIdentifier
diff --git a/FirebaseVertexAI/Tests/Unit/APIVersionTests.swift b/FirebaseVertexAI/Tests/Unit/APIVersionTests.swift
index d713009f405..0f9743b21a2 100644
--- a/FirebaseVertexAI/Tests/Unit/APIVersionTests.swift
+++ b/FirebaseVertexAI/Tests/Unit/APIVersionTests.swift
@@ -18,20 +18,6 @@ import XCTest
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class APIVersionTests: XCTestCase {
-  func testInitialize_stringLiteral() {
-    let apiVersion = APIVersion("test-version")
-
-    XCTAssertEqual(apiVersion.versionIdentifier, "test-version")
-  }
-
-  func testInitialize_stringConstant() {
-    let expectedVersion = "test-version"
-
-    let apiVersion = APIVersion(stringLiteral: expectedVersion)
-
-    XCTAssertEqual(apiVersion.versionIdentifier, expectedVersion)
-  }
-
   func testInitialize_v1() {
     let apiVersion: APIVersion = .v1
 
diff --git a/FirebaseVertexAI/Tests/Unit/RequestOptionsTest.swift b/FirebaseVertexAI/Tests/Unit/RequestOptionsTest.swift
index b8f6f82c7c8..adf9441d716 100644
--- a/FirebaseVertexAI/Tests/Unit/RequestOptionsTest.swift
+++ b/FirebaseVertexAI/Tests/Unit/RequestOptionsTest.swift
@@ -37,22 +37,6 @@ final class RequestOptionsTests: XCTestCase {
     XCTAssertEqual(requestOptions.apiVersion, defaultAPIVersion)
   }
 
-  func testInitialize_apiVersion_stringLiteral() {
-    let requestOptions = RequestOptions(apiVersion: "test-version")
-
-    XCTAssertEqual(requestOptions.timeout, defaultTimeout)
-    XCTAssertEqual(requestOptions.apiVersion, "test-version")
-  }
-
-  func testInitialize_apiVersion_stringConstant() {
-    let expectedVersion = "test-version"
-
-    let requestOptions = RequestOptions(apiVersion: APIVersion(stringLiteral: expectedVersion))
-
-    XCTAssertEqual(requestOptions.timeout, defaultTimeout)
-    XCTAssertEqual(requestOptions.apiVersion, expectedVersion)
-  }
-
   func testInitialize_apiVersion_v1() {
     let requestOptions = RequestOptions(apiVersion: .v1)
 
diff --git a/FirebaseVertexAI/Tests/Unit/VertexAIAPITests.swift b/FirebaseVertexAI/Tests/Unit/VertexAIAPITests.swift
index 82e9a73aa3b..30f16851260 100644
--- a/FirebaseVertexAI/Tests/Unit/VertexAIAPITests.swift
+++ b/FirebaseVertexAI/Tests/Unit/VertexAIAPITests.swift
@@ -38,14 +38,10 @@ final class VertexAIAPITests: XCTestCase {
       parts: TextPart("Talk like a pirate.")
     )
 
-    let apiVersionID = "v1"
-    let apiVersion = APIVersion.v1
-    let _ = RequestOptions()
+    let requestOptions = RequestOptions()
+    let _ = RequestOptions(timeout: 30.0)
     let _ = RequestOptions(apiVersion: .v1)
-    let _ = RequestOptions(apiVersion: "v1")
-    let _ = RequestOptions(apiVersion: APIVersion(stringLiteral: "v1"))
-    let _ = RequestOptions(apiVersion: APIVersion(stringLiteral: apiVersionID))
-    let _ = RequestOptions(apiVersion: apiVersion)
+    let _ = RequestOptions(timeout: 60.0, apiVersion: .v1)
 
     // Instantiate Vertex AI SDK - Default App
     let vertexAI = VertexAI.vertexAI()
@@ -79,7 +75,8 @@ final class VertexAIAPITests: XCTestCase {
       modelName: "gemini-1.0-pro",
       generationConfig: config, // Optional
       safetySettings: filters, // Optional
-      systemInstruction: systemInstruction // Optional
+      systemInstruction: systemInstruction, // Optional
+      requestOptions: requestOptions // Optional
     )
 
     // Full Typed Usage