diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
index f15dd0b61b2c..60337d143ef0 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -99,6 +99,9 @@ pub enum {{{operationIdCamelCase}}}Error {
 {{#notes}}
 /// {{{.}}}
 {{/notes}}
+{{#isDeprecated}}
+#[deprecated]
+{{/isDeprecated}}
 {{#vendorExtensions.x-group-parameters}}
 pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration: &configuration::Configuration{{#allParams}}{{#-first}}, {{!
 ### Params
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/pet_api.rs
index 587f56393813..7fc32c38810e 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/pet_api.rs
@@ -359,6 +359,7 @@ pub async fn find_pets_by_status(configuration: &configuration::Configuration, p
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub async fn find_pets_by_tags(configuration: &configuration::Configuration, params: FindPetsByTagsParams) -> Result<ResponseContent<FindPetsByTagsSuccess>, Error<FindPetsByTagsError>> {
 
     let uri_str = format!("{}/pet/findByTags", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/pet_api.rs
index b7e3167dc5dd..b45357f33a7b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/pet_api.rs
@@ -365,6 +365,7 @@ pub async fn find_pets_by_status(configuration: &configuration::Configuration, p
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub async fn find_pets_by_tags(configuration: &configuration::Configuration, params: FindPetsByTagsParams) -> Result<ResponseContent<FindPetsByTagsSuccess>, Error<FindPetsByTagsError>> {
 
     let uri_str = format!("{}/pet/findByTags", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/pet_api.rs
index 587f56393813..7fc32c38810e 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/pet_api.rs
@@ -359,6 +359,7 @@ pub async fn find_pets_by_status(configuration: &configuration::Configuration, p
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub async fn find_pets_by_tags(configuration: &configuration::Configuration, params: FindPetsByTagsParams) -> Result<ResponseContent<FindPetsByTagsSuccess>, Error<FindPetsByTagsError>> {
 
     let uri_str = format!("{}/pet/findByTags", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/pet_api.rs
index 587f56393813..7fc32c38810e 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/pet_api.rs
@@ -359,6 +359,7 @@ pub async fn find_pets_by_status(configuration: &configuration::Configuration, p
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub async fn find_pets_by_tags(configuration: &configuration::Configuration, params: FindPetsByTagsParams) -> Result<ResponseContent<FindPetsByTagsSuccess>, Error<FindPetsByTagsError>> {
 
     let uri_str = format!("{}/pet/findByTags", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/pet_api.rs
index d075b93b211a..8e5e914c8669 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/pet_api.rs
@@ -263,6 +263,7 @@ pub fn find_pets_by_status(configuration: &configuration::Configuration, status:
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub fn find_pets_by_tags(configuration: &configuration::Configuration, tags: Vec<String>) -> Result<Vec<models::Pet>, Error<FindPetsByTagsError>> {
     // add a prefix to parameters to efficiently prevent name collisions
     let p_query_tags = tags;
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/pet_api.rs
index e8b2edc55733..da2c44352b41 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/pet_api.rs
@@ -224,6 +224,7 @@ pub fn find_pets_by_status(configuration: &configuration::Configuration, status:
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub fn find_pets_by_tags(configuration: &configuration::Configuration, tags: Vec<String>) -> Result<Vec<models::FooPet>, Error<FindPetsByTagsError>> {
     // add a prefix to parameters to efficiently prevent name collisions
     let p_query_tags = tags;
diff --git a/samples/client/petstore/rust/reqwest/petstore/src/apis/pet_api.rs b/samples/client/petstore/rust/reqwest/petstore/src/apis/pet_api.rs
index 77a70ebe47d5..10c473c38c28 100644
--- a/samples/client/petstore/rust/reqwest/petstore/src/apis/pet_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore/src/apis/pet_api.rs
@@ -224,6 +224,7 @@ pub fn find_pets_by_status(configuration: &configuration::Configuration, status:
 }
 
 /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+#[deprecated]
 pub fn find_pets_by_tags(configuration: &configuration::Configuration, tags: Vec<String>) -> Result<Vec<models::Pet>, Error<FindPetsByTagsError>> {
     // add a prefix to parameters to efficiently prevent name collisions
     let p_query_tags = tags;