diff --git a/model/common_strings.smithy b/model/common_strings.smithy
index b6a2c928c..a2021587e 100644
--- a/model/common_strings.smithy
+++ b/model/common_strings.smithy
@@ -247,6 +247,10 @@ string PathTaskId
 @documentation("The name of the template.")
 string PathTemplateName
 
+@pattern("^(?!_|template|query|field|point|clear|usage|stats|hot|reload|painless).+$")
+@documentation("The id of the model.")
+string PathModelId
+
 @documentation("The analyzer to use for the query string.")
 string Analyzer
 
@@ -281,6 +285,9 @@ string Lang
 @documentation("Comma-separated list of the persistent ids of the nodes to exclude from the voting configuration. If specified, you may not also specify ?node_names.")
 string NodeIds
 
+@documentation("Preferred node to execute training.")
+string NodeId
+
 @documentation("Comma-separated list of the names of the nodes to exclude from the voting configuration. If specified, you may not also specify ?node_ids.")
 string NodeNames
 
diff --git a/model/knn/delete_model/operations.smithy b/model/knn/delete_model/operations.smithy
new file mode 100644
index 000000000..dcfae7faa
--- /dev/null
+++ b/model/knn/delete_model/operations.smithy
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@externalDocumentation(
+    "API Reference": "https://opensearch.org/docs/latest/search-plugins/knn/api/#delete-model"
+)
+
+@xOperationGroup("knn.delete_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "DELETE", uri: "/_plugins/_knn/models/{model_id}")
+@documentation("Used to delete a particular model in the cluster.")
+operation KNNDeleteModel {
+    input: KNNDeleteModel_Input,
+    output: KNNDeleteModel_Output
+}
diff --git a/model/knn/delete_model/structures.smithy b/model/knn/delete_model/structures.smithy
new file mode 100644
index 000000000..2f9fe30e0
--- /dev/null
+++ b/model/knn/delete_model/structures.smithy
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@input
+structure KNNDeleteModel_Input {
+    @required
+    @httpLabel
+    model_id: PathModelId,
+}
+
+// TODO: Fill in Output Structure
+structure KNNDeleteModel_Output {}
diff --git a/model/knn/get_model/operations.smithy b/model/knn/get_model/operations.smithy
new file mode 100644
index 000000000..557678686
--- /dev/null
+++ b/model/knn/get_model/operations.smithy
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@externalDocumentation(
+    "API Reference": "https://opensearch.org/docs/latest/search-plugins/knn/api/#get-model"
+)
+
+@xOperationGroup("knn.get_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "GET", uri: "/_plugins/_knn/models/{model_id}")
+@documentation("Used to retrieve information about models present in the cluster.")
+operation KNNGetModel {
+    input: KNNGetModel_Input,
+    output: KNNGetModel_Output
+}
diff --git a/model/knn/get_model/structures.smithy b/model/knn/get_model/structures.smithy
new file mode 100644
index 000000000..ad0bafd49
--- /dev/null
+++ b/model/knn/get_model/structures.smithy
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@input
+structure KNNGetModel_Input {
+    @required
+    @httpLabel
+    model_id: PathModelId,
+}
+
+// TODO: Fill in Output Structure
+structure KNNGetModel_Output {}
diff --git a/model/knn/search_model/operations.smithy b/model/knn/search_model/operations.smithy
new file mode 100644
index 000000000..49f1ee44d
--- /dev/null
+++ b/model/knn/search_model/operations.smithy
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@externalDocumentation(
+    "API Reference": "https://opensearch.org/docs/latest/search-plugins/knn/api/#search-model"
+)
+
+@xOperationGroup("knn.search_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "GET", uri: "/_plugins/_knn/models/_search")
+@documentation("Use an OpenSearch query to search for models in the index.")
+operation KNNSearchModel_Get {
+    input: KNNSearchModel_Get_Input,
+    output: KNNSearchModel_Output
+}
+
+@xOperationGroup("knn.search_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "POST", uri: "/_plugins/_knn/models/_search")
+@documentation("Use an OpenSearch query to search for models in the index.")
+operation KNNSearchModel_Post {
+    input: KNNSearchModel_Post_Input,
+    output: KNNSearchModel_Output
+}
\ No newline at end of file
diff --git a/model/knn/search_model/structures.smithy b/model/knn/search_model/structures.smithy
new file mode 100644
index 000000000..3e61a2305
--- /dev/null
+++ b/model/knn/search_model/structures.smithy
@@ -0,0 +1,167 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@mixin
+structure KNNSearchModel_QueryParams {
+    @httpQuery("analyzer")
+    analyzer: Analyzer,
+
+    @httpQuery("analyze_wildcard")
+    @default(false)
+    analyze_wildcard: AnalyzeWildcard,
+
+    @httpQuery("ccs_minimize_roundtrips")
+    @default(true)
+    ccs_minimize_roundtrips: CcsMinimizeRoundtrips,
+
+    @httpQuery("default_operator")
+    @default("OR")
+    default_operator: DefaultOperator,
+
+    @httpQuery("df")
+    df: Df,
+
+    @httpQuery("explain")
+    @documentation("Specify whether to return detailed information about score computation as part of a hit.")
+    explain: Explain,
+
+    @httpQuery("stored_fields")
+    stored_fields: StoredFields,
+
+    @httpQuery("docvalue_fields")
+    docvalue_fields: DocvalueFields,
+
+    @httpQuery("from")
+    @default(0)
+    from: From,
+
+    @httpQuery("ignore_unavailable")
+    ignore_unavailable: IgnoreUnavailable,
+
+    @httpQuery("ignore_throttled")
+    ignore_throttled: IgnoreThrottled,
+
+    @httpQuery("allow_no_indices")
+    allow_no_indices: AllowNoIndices,
+
+    @httpQuery("expand_wildcards")
+    @default("open")
+    expand_wildcards: ExpandWildcards,
+
+    @httpQuery("lenient")
+    lenient: Lenient,
+
+    @httpQuery("preference")
+    @default("random")
+    preference: Preference,
+
+    @httpQuery("q")
+    q: Q,
+
+    @httpQuery("routing")
+    routing: Routings,
+
+    @httpQuery("scroll")
+    scroll: Scroll,
+
+    @httpQuery("search_type")
+    search_type: SearchType,
+
+    @httpQuery("size")
+    @documentation("Number of hits to return.")
+    @default(10)
+    size: Size,
+
+    @httpQuery("sort")
+    sort: Sort,
+
+    @httpQuery("_source")
+    _source: Source,
+
+    @httpQuery("_source_excludes")
+    _source_excludes: SourceExcludes,
+
+    @httpQuery("_source_includes")
+    _source_includes: SourceIncludes,
+
+    @httpQuery("terminate_after")
+    terminate_after: TerminateAfter,
+
+    @httpQuery("stats")
+    stats: Stats,
+
+    @httpQuery("suggest_field")
+    suggest_field: SuggestField,
+
+    @httpQuery("suggest_mode")
+    @default("missing")
+    suggest_mode: SuggestMode,
+
+    @httpQuery("suggest_size")
+    suggest_size: SuggestSize,
+
+    @httpQuery("suggest_text")
+    suggest_text: SuggestText,
+
+    @httpQuery("timeout")
+    timeout: Timeout,
+
+    @httpQuery("track_scores")
+    track_scores: TrackScores,
+
+    @httpQuery("track_total_hits")
+    track_total_hits: TrackTotalHits,
+
+    @httpQuery("allow_partial_search_results")
+    @default(true)
+    allow_partial_search_results: AllowPartialSearchResults,
+
+    @httpQuery("typed_keys")
+    typed_keys: TypedKeys,
+
+    @httpQuery("version")
+    version: WithVersion,
+
+    @httpQuery("seq_no_primary_term")
+    seq_no_primary_term: SeqNoPrimaryTerm,
+
+    @httpQuery("request_cache")
+    request_cache: RequestCache,
+
+    @httpQuery("batched_reduce_size")
+    @default(512)
+    batched_reduce_size: BatchedReduceSize,
+
+    @httpQuery("max_concurrent_shard_requests")
+    @documentation("The number of concurrent shard requests per node this search executes concurrently. This value should be used to limit the impact of the search on the cluster in order to limit the number of concurrent shard requests.")
+    @default(5)
+    max_concurrent_shard_requests: MaxConcurrentShardRequests,
+
+    @httpQuery("pre_filter_shard_size")
+    pre_filter_shard_size: PreFilterShardSize,
+
+    @httpQuery("rest_total_hits_as_int")
+    @default(false)
+    rest_total_hits_as_int: RestTotalHitsAsInt,
+}
+
+// TODO: Fill in Body Parameters
+structure KNNSearchModel_BodyParams {}
+
+@input
+structure KNNSearchModel_Get_Input with [KNNSearchModel_QueryParams] {}
+
+@input
+structure KNNSearchModel_Post_Input with [KNNSearchModel_QueryParams] {
+    @httpPayload
+    content: KNNSearchModel_BodyParams,
+}
+
+// TODO: Fill in Output Structure
+structure KNNSearchModel_Output {}
diff --git a/model/knn/train_model/operations.smithy b/model/knn/train_model/operations.smithy
new file mode 100644
index 000000000..99430c005
--- /dev/null
+++ b/model/knn/train_model/operations.smithy
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@externalDocumentation(
+    "API Reference": "https://opensearch.org/docs/latest/search-plugins/knn/api/#train-model"
+)
+
+@xOperationGroup("knn.train_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "POST", uri: "/_plugins/_knn/models/_train")
+@documentation("Create and train a model that can be used for initializing k-NN native library indexes during indexing.")
+operation KNNTrainModel {
+    input: KNNTrainModel_Input,
+    output: KNNTrainModel_Output
+}
+
+@xOperationGroup("knn.train_model")
+@xVersionAdded("1.0")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "POST", uri: "/_plugins/_knn/models/{model_id}/_train")
+@documentation("Create and train a model that can be used for initializing k-NN native library indexes during indexing.")
+operation KNNTrainModel_WithModelId {
+    input: KNNTrainModel_WithModelId_Input,
+    output: KNNTrainModel_Output
+}
diff --git a/model/knn/train_model/structures.smithy b/model/knn/train_model/structures.smithy
new file mode 100644
index 000000000..096667250
--- /dev/null
+++ b/model/knn/train_model/structures.smithy
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@mixin
+structure KNNTrainModel_QueryParams {
+    @httpQuery("preference")
+    preference: NodeId,
+}
+
+structure KNNTrainModel_BodyParams {
+    @required
+    training_index: String,
+
+    @required
+    training_field: String,
+
+    @required
+    dimension: Integer,
+
+    max_training_vector_count: Integer,
+
+    search_size: Integer,
+
+    description: String,
+
+    @required
+    method: String,
+}
+
+@input
+structure KNNTrainModel_Input  with [KNNTrainModel_QueryParams] {
+    @required
+    @httpPayload
+    content: KNNTrainModel_BodyParams,
+}
+
+@input
+structure KNNTrainModel_WithModelId_Input  with [KNNTrainModel_QueryParams] {
+    @required
+    @httpPayload
+    content: KNNTrainModel_BodyParams,
+
+    @required
+    @httpLabel
+    model_id: PathModelId,
+}
+
+// TODO: Fill in Output Structure
+structure KNNTrainModel_Output {}
diff --git a/model/opensearch.smithy b/model/opensearch.smithy
index ccb6b3805..d4f6d1816 100644
--- a/model/opensearch.smithy
+++ b/model/opensearch.smithy
@@ -256,6 +256,12 @@ service OpenSearch {
         IngestSimulate_Get_WithId,
         IngestSimulate_Post,
         IngestSimulate_Post_WithId,
+        KNNDeleteModel,
+        KNNGetModel,
+        KNNSearchModel_Get,
+        KNNSearchModel_Post,
+        KNNTrainModel,
+        KNNTrainModel_WithModelId,
         Mget_Get,
         Mget_Get_WithIndex,
         Mget_Post,