diff --git a/clients/client-s3/src/commands/DeleteObjectsCommand.ts b/clients/client-s3/src/commands/DeleteObjectsCommand.ts
index 57727ddec80d7..09378b0aaa82b 100644
--- a/clients/client-s3/src/commands/DeleteObjectsCommand.ts
+++ b/clients/client-s3/src/commands/DeleteObjectsCommand.ts
@@ -307,7 +307,6 @@ export class DeleteObjectsCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/GetObjectCommand.ts b/clients/client-s3/src/commands/GetObjectCommand.ts
index 3af214d29fc66..154538a85f1a9 100644
--- a/clients/client-s3/src/commands/GetObjectCommand.ts
+++ b/clients/client-s3/src/commands/GetObjectCommand.ts
@@ -360,7 +360,6 @@ export class GetObjectCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestChecksumRequired: false,
         requestValidationModeMember: "ChecksumMode",
         responseAlgorithms: ["CRC32", "CRC32C", "SHA256", "SHA1"],
diff --git a/clients/client-s3/src/commands/PutBucketAccelerateConfigurationCommand.ts b/clients/client-s3/src/commands/PutBucketAccelerateConfigurationCommand.ts
index 6be66e3545fee..0a3945af0266a 100644
--- a/clients/client-s3/src/commands/PutBucketAccelerateConfigurationCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketAccelerateConfigurationCommand.ts
@@ -123,7 +123,6 @@ export class PutBucketAccelerateConfigurationCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: false,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketAclCommand.ts b/clients/client-s3/src/commands/PutBucketAclCommand.ts
index a19c526d14618..b1963d325ae67 100644
--- a/clients/client-s3/src/commands/PutBucketAclCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketAclCommand.ts
@@ -314,7 +314,6 @@ export class PutBucketAclCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketCorsCommand.ts b/clients/client-s3/src/commands/PutBucketCorsCommand.ts
index eff76383c463f..55c4c5d33fe92 100644
--- a/clients/client-s3/src/commands/PutBucketCorsCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketCorsCommand.ts
@@ -198,7 +198,6 @@ export class PutBucketCorsCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketEncryptionCommand.ts b/clients/client-s3/src/commands/PutBucketEncryptionCommand.ts
index 62f5fcb6295d2..4d08df19335f7 100644
--- a/clients/client-s3/src/commands/PutBucketEncryptionCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketEncryptionCommand.ts
@@ -198,7 +198,6 @@ export class PutBucketEncryptionCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketLifecycleConfigurationCommand.ts b/clients/client-s3/src/commands/PutBucketLifecycleConfigurationCommand.ts
index 12cf746492154..9dd8deb0a1dc3 100644
--- a/clients/client-s3/src/commands/PutBucketLifecycleConfigurationCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketLifecycleConfigurationCommand.ts
@@ -260,7 +260,6 @@ export class PutBucketLifecycleConfigurationCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketLoggingCommand.ts b/clients/client-s3/src/commands/PutBucketLoggingCommand.ts
index 4efecf7ecadbf..6c825b4adaa82 100644
--- a/clients/client-s3/src/commands/PutBucketLoggingCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketLoggingCommand.ts
@@ -214,7 +214,6 @@ export class PutBucketLoggingCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketOwnershipControlsCommand.ts b/clients/client-s3/src/commands/PutBucketOwnershipControlsCommand.ts
index f9d3c1c96f848..65fec824b489c 100644
--- a/clients/client-s3/src/commands/PutBucketOwnershipControlsCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketOwnershipControlsCommand.ts
@@ -104,7 +104,6 @@ export class PutBucketOwnershipControlsCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestChecksumRequired: true,
       }),
     ];
diff --git a/clients/client-s3/src/commands/PutBucketPolicyCommand.ts b/clients/client-s3/src/commands/PutBucketPolicyCommand.ts
index 18f341a279927..ddf473bb2ff0b 100644
--- a/clients/client-s3/src/commands/PutBucketPolicyCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketPolicyCommand.ts
@@ -157,7 +157,6 @@ export class PutBucketPolicyCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketReplicationCommand.ts b/clients/client-s3/src/commands/PutBucketReplicationCommand.ts
index 641379180e0fc..f5023f652783c 100644
--- a/clients/client-s3/src/commands/PutBucketReplicationCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketReplicationCommand.ts
@@ -239,7 +239,6 @@ export class PutBucketReplicationCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketRequestPaymentCommand.ts b/clients/client-s3/src/commands/PutBucketRequestPaymentCommand.ts
index 8cde3add1e7e4..40b02d7774fea 100644
--- a/clients/client-s3/src/commands/PutBucketRequestPaymentCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketRequestPaymentCommand.ts
@@ -114,7 +114,6 @@ export class PutBucketRequestPaymentCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketTaggingCommand.ts b/clients/client-s3/src/commands/PutBucketTaggingCommand.ts
index 35c320c62eb83..94a3a4d440756 100644
--- a/clients/client-s3/src/commands/PutBucketTaggingCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketTaggingCommand.ts
@@ -168,7 +168,6 @@ export class PutBucketTaggingCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketVersioningCommand.ts b/clients/client-s3/src/commands/PutBucketVersioningCommand.ts
index 4b242e4860f7f..34f8d2734a3c1 100644
--- a/clients/client-s3/src/commands/PutBucketVersioningCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketVersioningCommand.ts
@@ -149,7 +149,6 @@ export class PutBucketVersioningCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutBucketWebsiteCommand.ts b/clients/client-s3/src/commands/PutBucketWebsiteCommand.ts
index 495a23513fe2d..6f2a528dfee8a 100644
--- a/clients/client-s3/src/commands/PutBucketWebsiteCommand.ts
+++ b/clients/client-s3/src/commands/PutBucketWebsiteCommand.ts
@@ -249,7 +249,6 @@ export class PutBucketWebsiteCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectAclCommand.ts b/clients/client-s3/src/commands/PutObjectAclCommand.ts
index ab7017a2e28c2..4724ddaa77c34 100644
--- a/clients/client-s3/src/commands/PutObjectAclCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectAclCommand.ts
@@ -313,7 +313,6 @@ export class PutObjectAclCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectCommand.ts b/clients/client-s3/src/commands/PutObjectCommand.ts
index b9978cd24f94d..a818ed1a0cb3a 100644
--- a/clients/client-s3/src/commands/PutObjectCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectCommand.ts
@@ -413,7 +413,6 @@ export class PutObjectCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: false,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectLegalHoldCommand.ts b/clients/client-s3/src/commands/PutObjectLegalHoldCommand.ts
index 4439d9908630a..278ef5292dc71 100644
--- a/clients/client-s3/src/commands/PutObjectLegalHoldCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectLegalHoldCommand.ts
@@ -91,7 +91,6 @@ export class PutObjectLegalHoldCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectLockConfigurationCommand.ts b/clients/client-s3/src/commands/PutObjectLockConfigurationCommand.ts
index 7041958683bb0..8b99cda53a4c4 100644
--- a/clients/client-s3/src/commands/PutObjectLockConfigurationCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectLockConfigurationCommand.ts
@@ -114,7 +114,6 @@ export class PutObjectLockConfigurationCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectRetentionCommand.ts b/clients/client-s3/src/commands/PutObjectRetentionCommand.ts
index 74c56d0a12a5e..587834590e1ae 100644
--- a/clients/client-s3/src/commands/PutObjectRetentionCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectRetentionCommand.ts
@@ -94,7 +94,6 @@ export class PutObjectRetentionCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutObjectTaggingCommand.ts b/clients/client-s3/src/commands/PutObjectTaggingCommand.ts
index 06510a97f7092..f6f48c3d17c80 100644
--- a/clients/client-s3/src/commands/PutObjectTaggingCommand.ts
+++ b/clients/client-s3/src/commands/PutObjectTaggingCommand.ts
@@ -174,7 +174,6 @@ export class PutObjectTaggingCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/PutPublicAccessBlockCommand.ts b/clients/client-s3/src/commands/PutPublicAccessBlockCommand.ts
index 4306cf2cbe5fe..b3ab5faf036f1 100644
--- a/clients/client-s3/src/commands/PutPublicAccessBlockCommand.ts
+++ b/clients/client-s3/src/commands/PutPublicAccessBlockCommand.ts
@@ -122,7 +122,6 @@ export class PutPublicAccessBlockCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: true,
       }),
diff --git a/clients/client-s3/src/commands/RestoreObjectCommand.ts b/clients/client-s3/src/commands/RestoreObjectCommand.ts
index a63ff0f640b21..11eaff639df1a 100644
--- a/clients/client-s3/src/commands/RestoreObjectCommand.ts
+++ b/clients/client-s3/src/commands/RestoreObjectCommand.ts
@@ -388,7 +388,6 @@ export class RestoreObjectCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: false,
       }),
diff --git a/clients/client-s3/src/commands/UploadPartCommand.ts b/clients/client-s3/src/commands/UploadPartCommand.ts
index 3e029af75c2ad..a842c4deb4495 100644
--- a/clients/client-s3/src/commands/UploadPartCommand.ts
+++ b/clients/client-s3/src/commands/UploadPartCommand.ts
@@ -309,7 +309,6 @@ export class UploadPartCommand extends $Command
       getSerdePlugin(config, this.serialize, this.deserialize),
       getEndpointPlugin(config, Command.getEndpointParameterInstructions()),
       getFlexibleChecksumsPlugin(config, {
-        input: this.input,
         requestAlgorithmMember: "ChecksumAlgorithm",
         requestChecksumRequired: false,
       }),
diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddHttpChecksumDependency.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddHttpChecksumDependency.java
index 94eed9a133b26..ccf41e150e2e6 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddHttpChecksumDependency.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddHttpChecksumDependency.java
@@ -25,7 +25,6 @@
 import java.util.TreeMap;
 import java.util.function.Consumer;
 import software.amazon.smithy.aws.traits.HttpChecksumTrait;
-import software.amazon.smithy.codegen.core.Symbol;
 import software.amazon.smithy.codegen.core.SymbolProvider;
 import software.amazon.smithy.model.Model;
 import software.amazon.smithy.model.knowledge.TopDownIndex;
@@ -197,7 +196,6 @@ private static Map<String, Object> getPluginFunctionParams(
         OperationShape operation
     ) {
         Map<String, Object> params = new TreeMap<String, Object>();
-        params.put("input", Symbol.builder().name("this.input").build());
 
         HttpChecksumTrait httpChecksumTrait = operation.expectTrait(HttpChecksumTrait.class);
         params.put("requestChecksumRequired", httpChecksumTrait.isRequestChecksumRequired());
diff --git a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.spec.ts b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.spec.ts
index a29583f62c353..9d284db11a2ae 100644
--- a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.spec.ts
+++ b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.spec.ts
@@ -29,12 +29,12 @@ describe(flexibleChecksumsMiddleware.name, () => {
 
   const mockInput = {};
   const mockConfig = {} as PreviouslyResolved;
-  const mockMiddlewareConfig = { input: mockInput, requestChecksumRequired: false };
+  const mockMiddlewareConfig = { requestChecksumRequired: false };
 
   const mockBody = { body: "mockRequestBody" };
   const mockHeaders = { "content-length": 100, "content-encoding": "gzip" };
   const mockRequest = { body: mockBody, headers: mockHeaders };
-  const mockArgs = { request: mockRequest } as BuildHandlerArguments<any>;
+  const mockArgs = { input: mockInput, request: mockRequest } as BuildHandlerArguments<any>;
   const mockResult = { response: { body: "mockResponsebody" } };
 
   beforeEach(() => {
diff --git a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
index cc5efb32212a3..317537dd9ab7a 100644
--- a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
+++ b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
@@ -21,10 +21,6 @@ import { stringHasher } from "./stringHasher";
 
 export interface FlexibleChecksumsRequestMiddlewareConfig {
   /**
-   * The input object for the operation.
-   */
-  input: Object;
-
   /**
    * Indicates an operation requires a checksum in its HTTP request.
    */
@@ -57,10 +53,10 @@ export const flexibleChecksumsMiddleware =
       return next(args);
     }
 
-    const { request } = args;
+    const { request, input } = args;
     const { body: requestBody, headers } = request;
     const { base64Encoder, streamHasher } = config;
-    const { input, requestChecksumRequired, requestAlgorithmMember } = middlewareConfig;
+    const { requestChecksumRequired, requestAlgorithmMember } = middlewareConfig;
 
     const checksumAlgorithm = getChecksumAlgorithmForRequest(
       input,