diff --git a/packages/artifact/__tests__/get-artifact.test.ts b/packages/artifact/__tests__/get-artifact.test.ts
new file mode 100644
index 00000000..aa2b5331
--- /dev/null
+++ b/packages/artifact/__tests__/get-artifact.test.ts
@@ -0,0 +1,205 @@
+import * as github from '@actions/github'
+import type {RequestInterface} from '@octokit/types'
+import {
+  getArtifactInternal,
+  getArtifactPublic
+} from '../src/internal/find/get-artifact'
+import * as config from '../src/internal/shared/config'
+import {ArtifactServiceClientJSON} from '../src/generated'
+import * as util from '../src/internal/shared/util'
+import {noopLogs} from './common'
+
+type MockedRequest = jest.MockedFunction<RequestInterface<object>>
+
+jest.mock('@actions/github', () => ({
+  getOctokit: jest.fn().mockReturnValue({
+    request: jest.fn()
+  })
+}))
+
+const fixtures = {
+  repo: 'toolkit',
+  owner: 'actions',
+  token: 'ghp_1234567890',
+  runId: 123,
+  backendIds: {
+    workflowRunBackendId: 'c4d7c21f-ba3f-4ddc-a8c8-6f2f626f8422',
+    workflowJobRunBackendId: '760803a1-f890-4d25-9a6e-a3fc01a0c7cf'
+  },
+  artifacts: [
+    {
+      id: 1,
+      name: 'my-artifact',
+      size: 456,
+      createdAt: new Date('2023-12-01')
+    },
+    {
+      id: 2,
+      name: 'my-artifact',
+      size: 456,
+      createdAt: new Date('2023-12-02')
+    }
+  ]
+}
+
+describe('get-artifact', () => {
+  beforeAll(() => {
+    noopLogs()
+  })
+
+  describe('public', () => {
+    it('should return the artifact if it is found', async () => {
+      const mockRequest = github.getOctokit(fixtures.token)
+        .request as MockedRequest
+      mockRequest.mockResolvedValueOnce({
+        status: 200,
+        headers: {},
+        url: '',
+        data: {
+          artifacts: [
+            {
+              name: fixtures.artifacts[0].name,
+              id: fixtures.artifacts[0].id,
+              size_in_bytes: fixtures.artifacts[0].size,
+              created_at: fixtures.artifacts[0].createdAt.toISOString()
+            }
+          ]
+        }
+      })
+
+      const response = await getArtifactPublic(
+        fixtures.artifacts[0].name,
+        fixtures.runId,
+        fixtures.owner,
+        fixtures.repo,
+        fixtures.token
+      )
+
+      expect(response).toEqual({
+        success: true,
+        artifact: fixtures.artifacts[0]
+      })
+    })
+
+    it('should return the latest artifact if multiple are found', async () => {
+      const mockRequest = github.getOctokit(fixtures.token)
+        .request as MockedRequest
+      mockRequest.mockResolvedValueOnce({
+        status: 200,
+        headers: {},
+        url: '',
+        data: {
+          artifacts: fixtures.artifacts.map(artifact => ({
+            name: artifact.name,
+            id: artifact.id,
+            size_in_bytes: artifact.size,
+            created_at: artifact.createdAt.toISOString()
+          }))
+        }
+      })
+
+      const response = await getArtifactPublic(
+        fixtures.artifacts[0].name,
+        fixtures.runId,
+        fixtures.owner,
+        fixtures.repo,
+        fixtures.token
+      )
+
+      expect(response).toEqual({
+        success: true,
+        artifact: fixtures.artifacts[1]
+      })
+    })
+
+    it('should fail if no artifacts are found', async () => {
+      const mockRequest = github.getOctokit(fixtures.token)
+        .request as MockedRequest
+      mockRequest.mockResolvedValueOnce({
+        status: 200,
+        headers: {},
+        url: '',
+        data: {
+          artifacts: []
+        }
+      })
+
+      const response = await getArtifactPublic(
+        fixtures.artifacts[0].name,
+        fixtures.runId,
+        fixtures.owner,
+        fixtures.repo,
+        fixtures.token
+      )
+
+      expect(response).toEqual({
+        success: false
+      })
+    })
+
+    it('should fail if non-200 response', async () => {
+      const mockRequest = github.getOctokit(fixtures.token)
+        .request as MockedRequest
+      mockRequest.mockResolvedValueOnce({
+        status: 404,
+        headers: {},
+        url: '',
+        data: {}
+      })
+
+      const response = await getArtifactPublic(
+        fixtures.artifacts[0].name,
+        fixtures.runId,
+        fixtures.owner,
+        fixtures.repo,
+        fixtures.token
+      )
+
+      expect(response).toEqual({
+        success: false
+      })
+    })
+  })
+
+  describe('internal', () => {
+    beforeEach(() => {
+      jest.spyOn(config, 'getRuntimeToken').mockReturnValue('test-token')
+
+      jest
+        .spyOn(util, 'getBackendIdsFromToken')
+        .mockReturnValue(fixtures.backendIds)
+
+      jest
+        .spyOn(config, 'getResultsServiceUrl')
+        .mockReturnValue('https://results.local')
+    })
+
+    it('should return the artifact if it is found', async () => {
+      jest
+        .spyOn(ArtifactServiceClientJSON.prototype, 'ListArtifacts')
+        .mockResolvedValue({
+          artifacts: [
+            {
+              ...fixtures.backendIds,
+              databaseId: fixtures.artifacts[0].id.toString(),
+              name: fixtures.artifacts[0].name,
+              size: fixtures.artifacts[0].size.toString()
+            }
+          ]
+        })
+
+      const response = await getArtifactInternal(fixtures.artifacts[0].name)
+
+      expect(response).toEqual({
+        success: true,
+        artifact: fixtures.artifacts[0]
+      })
+    })
+
+    it('should return the latest artifact if multiple are found', async () => {})
+
+    it('should fail if no artifacts are found', async () => {})
+
+    it('should fail if non-200 response', async () => {})
+  })
+})
diff --git a/packages/artifact/src/internal/client.ts b/packages/artifact/src/internal/client.ts
index 4811104c..97559652 100644
--- a/packages/artifact/src/internal/client.ts
+++ b/packages/artifact/src/internal/client.ts
@@ -1,8 +1,8 @@
 import {warning} from '@actions/core'
 import {isGhes} from './shared/config'
 import {
-  UploadOptions,
-  UploadResponse,
+  UploadArtifactOptions,
+  UploadArtifactResponse,
   DownloadArtifactOptions,
   GetArtifactResponse,
   ListArtifactsOptions,
@@ -26,14 +26,14 @@ export interface ArtifactClient {
    * @param files A list of absolute or relative paths that denote what files should be uploaded
    * @param rootDirectory An absolute or relative file path that denotes the root parent directory of the files being uploaded
    * @param options Extra options for customizing the upload behavior
-   * @returns single UploadResponse object
+   * @returns single UploadArtifactResponse object
    */
   uploadArtifact(
     name: string,
     files: string[],
     rootDirectory: string,
-    options?: UploadOptions
-  ): Promise<UploadResponse>
+    options?: UploadArtifactOptions
+  ): Promise<UploadArtifactResponse>
 
   /**
    * Lists all artifacts that are part of the current workflow run.
@@ -96,8 +96,8 @@ export class Client implements ArtifactClient {
     name: string,
     files: string[],
     rootDirectory: string,
-    options?: UploadOptions
-  ): Promise<UploadResponse> {
+    options?: UploadArtifactOptions
+  ): Promise<UploadArtifactResponse> {
     if (isGhes()) {
       warning(
         `@actions/artifact v2.0.0+ and upload-artifact@v4+ are not currently supported on GHES.`
diff --git a/packages/artifact/src/internal/find/get-artifact.ts b/packages/artifact/src/internal/find/get-artifact.ts
index 2bc1dc97..91c85818 100644
--- a/packages/artifact/src/internal/find/get-artifact.ts
+++ b/packages/artifact/src/internal/find/get-artifact.ts
@@ -56,12 +56,9 @@ export async function getArtifactPublic(
 
   let artifact = getArtifactResp.data.artifacts[0]
   if (getArtifactResp.data.artifacts.length > 1) {
-    artifact = getArtifactResp.data.artifacts.reduce((prev, current) => {
-      new Date(prev.created_at) > new Date(current.created_at) ? prev : current
-    })
-
+    artifact = getArtifactResp.data.artifacts.sort((a, b) => b.id - a.id)[0]
     core.debug(
-      `more than one artifact found for a single name, returning newest (id: ${artifact.id})`
+      `More than one artifact found for a single name, returning newest (id: ${artifact.id})`
     )
   }
 
@@ -101,11 +98,9 @@ export async function getArtifactInternal(
 
   let artifact = res.artifacts[0]
   if (res.artifacts.length > 1) {
-    artifact = res.artifacts.reduce((prev, current) => {
-      const prevDate = Timestamp.toDate(prev.createdAt || Timestamp.now())
-      const currentDate = Timestamp.toDate(current.createdAt || Timestamp.now())
-      return prevDate > currentDate ? prev : current
-    })
+    artifact = res.artifacts.sort(
+      (a, b) => Number(b.databaseId) - Number(a.databaseId)
+    )[0]
 
     core.debug(
       `more than one artifact found for a single name, returning newest (id: ${artifact.databaseId})`
diff --git a/packages/artifact/src/internal/find/list-artifacts.ts b/packages/artifact/src/internal/find/list-artifacts.ts
index a61ca583..cd83320c 100644
--- a/packages/artifact/src/internal/find/list-artifacts.ts
+++ b/packages/artifact/src/internal/find/list-artifacts.ts
@@ -152,19 +152,7 @@ export async function listArtifactsInternal(
  * @returns The filtered list of artifacts
  */
 function filterLatest(artifacts: Artifact[]): Artifact[] {
-  artifacts.sort((a, b) => {
-    if (!a.createdAt && !b.createdAt) {
-      return 0
-    }
-    if (!a.createdAt) {
-      return -1
-    }
-    if (!b.createdAt) {
-      return 1
-    }
-    return b.createdAt.getTime() - a.createdAt.getTime()
-  })
-
+  artifacts.sort((a, b) => b.id - a.id)
   const latestArtifacts: Artifact[] = []
   const seenArtifactNames = new Set<string>()
   for (const artifact of artifacts) {
@@ -173,6 +161,5 @@ function filterLatest(artifacts: Artifact[]): Artifact[] {
       seenArtifactNames.add(artifact.name)
     }
   }
-
   return latestArtifacts
 }
diff --git a/packages/artifact/src/internal/shared/interfaces.ts b/packages/artifact/src/internal/shared/interfaces.ts
index 647e265f..61994b2b 100644
--- a/packages/artifact/src/internal/shared/interfaces.ts
+++ b/packages/artifact/src/internal/shared/interfaces.ts
@@ -3,7 +3,7 @@
  *                            UploadArtifact                                 *
  *                                                                           *
  *****************************************************************************/
-export interface UploadResponse {
+export interface UploadArtifactResponse {
   /**
    * Denotes if an artifact was successfully uploaded
    */
@@ -21,7 +21,7 @@ export interface UploadResponse {
   id?: number
 }
 
-export interface UploadOptions {
+export interface UploadArtifactOptions {
   /**
    * Duration after which artifact will expire in days.
    *