diff --git a/src/AnthropicClient/Models/AnthropicFile.cs b/src/AnthropicClient/Models/AnthropicFile.cs
index 0cc2ca6..a736a39 100644
--- a/src/AnthropicClient/Models/AnthropicFile.cs
+++ b/src/AnthropicClient/Models/AnthropicFile.cs
@@ -9,14 +9,12 @@ public class AnthropicFile
 {
   /// <summary>
   /// Unique object identifier.
-  /// The format and length of IDs may change over time.
   /// </summary>
   [JsonPropertyName("id")]
   public string Id { get; init; } = string.Empty;
 
   /// <summary>
   /// Object type.
-  /// For files, this is always "file".
   /// </summary>
   [JsonPropertyName("type")]
   public string Type { get; init; } = "file";
@@ -24,26 +22,26 @@ public class AnthropicFile
   /// <summary>
   /// Original filename of the uploaded file.
   /// </summary>
-  [JsonPropertyName("file_name")]
-  public string FileName { get; init; } = string.Empty;
+  [JsonPropertyName("filename")]
+  public string Name { get; init; } = string.Empty;
 
   /// <summary>
-  /// RFC 3339 datetime string representing when the file was created.
+  /// Date file was created.
   /// </summary>
   [JsonPropertyName("created_at")]
-  public string CreatedAt { get; init; } = string.Empty;
+  public DateTimeOffset CreatedAt { get; init; }
 
   /// <summary>
   /// Size of the file in bytes.
   /// </summary>
   [JsonPropertyName("size_bytes")]
-  public long SizeBytes { get; init; }
+  public long Size { get; init; }
 
   /// <summary>
   /// MIME type of the file.
   /// </summary>
-  [JsonPropertyName("file_type")]
-  public string FileType { get; init; } = string.Empty;
+  [JsonPropertyName("mime_type")]
+  public string MimeType { get; init; } = string.Empty;
 
   /// <summary>
   /// Whether the file can be downloaded.
diff --git a/tests/AnthropicClient.Tests/Integration/AnthropicApiClientTests.cs b/tests/AnthropicClient.Tests/Integration/AnthropicApiClientTests.cs
index 6cab022..ff05315 100644
--- a/tests/AnthropicClient.Tests/Integration/AnthropicApiClientTests.cs
+++ b/tests/AnthropicClient.Tests/Integration/AnthropicApiClientTests.cs
@@ -1928,4 +1928,41 @@ public class AnthropicApiClientTests : IntegrationTest
     result.Value.Id.Should().Be(batchId);
     result.Value.Type.Should().Be("message_batch_deleted");
   }
+
+  [Fact]
+  public async Task CreateFileAsync_WhenCalled_ItShouldReturnFile()
+  {
+    _mockHttpMessageHandler
+      .WhenCreateFileRequest()
+      .Respond(
+        HttpStatusCode.OK,
+        "application/json",
+        @"{
+          ""created_at"": ""2023-11-07T05:31:56Z"",
+          ""downloadable"": false,
+          ""filename"": ""example.txt"",
+          ""id"": ""file_013Zva2CMHLNnXjNJJKqJ2EF"",
+          ""mime_type"": ""text/plain"",
+          ""size_bytes"": 1234,
+          ""type"": ""file""
+        }"
+      );
+
+    var fileContent = new MemoryStream(Encoding.UTF8.GetBytes("Example file content"));
+    var request = new CreateFileRequest(fileContent, "example.txt", "text/plain");
+
+    var result = await Client.CreateFileAsync(request);
+
+    result.IsSuccess.Should().BeTrue();
+    result.Value.Should().BeEquivalentTo(new AnthropicFile()
+    {
+      CreatedAt = DateTimeOffset.Parse("2023-11-07T05:31:56Z"),
+      Downloadable = false,
+      Name = "example.txt",
+      Id = "file_013Zva2CMHLNnXjNJJKqJ2EF",
+      MimeType = "text/plain",
+      Size = 1234,
+      Type = "file"
+    });
+  }
 }
\ No newline at end of file
diff --git a/tests/AnthropicClient.Tests/Integration/IntegrationTest.cs b/tests/AnthropicClient.Tests/Integration/IntegrationTest.cs
index 223107b..f618b44 100644
--- a/tests/AnthropicClient.Tests/Integration/IntegrationTest.cs
+++ b/tests/AnthropicClient.Tests/Integration/IntegrationTest.cs
@@ -20,6 +20,7 @@ public static class MockHttpMessageHandlerExtensions
   private static readonly string CountTokensEndpoint = $"{BaseUrl}/messages/count_tokens";
   private static readonly string MessageBatchesEndpoint = $"{BaseUrl}/messages/batches";
   private static readonly string ModelsEndpoint = $"{BaseUrl}/models";
+  private static readonly string FilesEndpoint = $"{BaseUrl}/files";
 
   private static MockedRequest SetupBaseRequest(
     this MockHttpMessageHandler mockHttpMessageHandler,
@@ -103,4 +104,10 @@ public static class MockHttpMessageHandlerExtensions
     return mockHttpMessageHandler
       .SetupBaseRequest(HttpMethod.Delete, $"{MessageBatchesEndpoint}/{batchId}");
   }
+
+  public static MockedRequest WhenCreateFileRequest(this MockHttpMessageHandler mockHttpMessageHandler)
+  {
+    return mockHttpMessageHandler
+      .SetupBaseRequest(HttpMethod.Post, FilesEndpoint);
+  }
 }
\ No newline at end of file