diff --git a/src/resources/beta/threads/messages/messages.ts b/src/resources/beta/threads/messages/messages.ts
index a2f2aaf1c..1c37eb2ff 100644
--- a/src/resources/beta/threads/messages/messages.ts
+++ b/src/resources/beta/threads/messages/messages.ts
@@ -353,9 +353,9 @@ export interface Message {
   role: 'user' | 'assistant';
 
   /**
-   * If applicable, the ID of the
-   * [run](https://platform.openai.com/docs/api-reference/runs) associated with the
-   * authoring of this message.
+   * The ID of the [run](https://platform.openai.com/docs/api-reference/runs)
+   * associated with the creation of this message. Value is `null` when messages are
+   * created manually using the create message or create thread endpoints.
    */
   run_id: string | null;
 
@@ -501,10 +501,14 @@ export interface MessageCreateParams {
   content: string;
 
   /**
-   * The role of the entity that is creating the message. Currently only `user` is
-   * supported.
+   * The role of the entity that is creating the message. Allowed values include:
+   *
+   * - `user`: Indicates the message is sent by an actual user and should be used in
+   *   most cases to represent user-generated messages.
+   * - `assistant`: Indicates the message is generated by the assistant. Use this
+   *   value to insert messages from the assistant into the conversation.
    */
-  role: 'user';
+  role: 'user' | 'assistant';
 
   /**
    * A list of [File](https://platform.openai.com/docs/api-reference/files) IDs that
diff --git a/src/resources/beta/threads/runs/runs.ts b/src/resources/beta/threads/runs/runs.ts
index a28dd9ae9..54c671131 100644
--- a/src/resources/beta/threads/runs/runs.ts
+++ b/src/resources/beta/threads/runs/runs.ts
@@ -331,6 +331,11 @@ export interface Run {
    * in a terminal state (i.e. `in_progress`, `queued`, etc.).
    */
   usage: Run.Usage | null;
+
+  /**
+   * The sampling temperature used for this run. If not set, defaults to 1.
+   */
+  temperature?: number | null;
 }
 
 export namespace Run {
@@ -461,6 +466,13 @@ export interface RunCreateParamsBase {
    */
   stream?: boolean | null;
 
+  /**
+   * What sampling temperature to use, between 0 and 2. Higher values like 0.8 will
+   * make the output more random, while lower values like 0.2 will make it more
+   * focused and deterministic.
+   */
+  temperature?: number | null;
+
   /**
    * Override the tools the assistant can use for this run. This is useful for
    * modifying the behavior on a per-run basis.
@@ -555,6 +567,13 @@ export interface RunCreateAndStreamParams {
    */
   model?: string | null;
 
+  /**
+   * What sampling temperature to use, between 0 and 2. Higher values like 0.8 will
+   * make the output more random, while lower values like 0.2 will make it more
+   * focused and deterministic.
+   */
+  temperature?: number | null;
+
   /**
    * Override the tools the assistant can use for this run. This is useful for
    * modifying the behavior on a per-run basis.
diff --git a/src/resources/beta/threads/threads.ts b/src/resources/beta/threads/threads.ts
index 266f6709e..9b4785850 100644
--- a/src/resources/beta/threads/threads.ts
+++ b/src/resources/beta/threads/threads.ts
@@ -164,10 +164,14 @@ export namespace ThreadCreateParams {
     content: string;
 
     /**
-     * The role of the entity that is creating the message. Currently only `user` is
-     * supported.
+     * The role of the entity that is creating the message. Allowed values include:
+     *
+     * - `user`: Indicates the message is sent by an actual user and should be used in
+     *   most cases to represent user-generated messages.
+     * - `assistant`: Indicates the message is generated by the assistant. Use this
+     *   value to insert messages from the assistant into the conversation.
      */
-    role: 'user';
+    role: 'user' | 'assistant';
 
     /**
      * A list of [File](https://platform.openai.com/docs/api-reference/files) IDs that
@@ -238,6 +242,13 @@ export interface ThreadCreateAndRunParamsBase {
    */
   stream?: boolean | null;
 
+  /**
+   * What sampling temperature to use, between 0 and 2. Higher values like 0.8 will
+   * make the output more random, while lower values like 0.2 will make it more
+   * focused and deterministic.
+   */
+  temperature?: number | null;
+
   /**
    * If no thread is provided, an empty thread will be created.
    */
@@ -280,10 +291,14 @@ export namespace ThreadCreateAndRunParams {
       content: string;
 
       /**
-       * The role of the entity that is creating the message. Currently only `user` is
-       * supported.
+       * The role of the entity that is creating the message. Allowed values include:
+       *
+       * - `user`: Indicates the message is sent by an actual user and should be used in
+       *   most cases to represent user-generated messages.
+       * - `assistant`: Indicates the message is generated by the assistant. Use this
+       *   value to insert messages from the assistant into the conversation.
        */
-      role: 'user';
+      role: 'user' | 'assistant';
 
       /**
        * A list of [File](https://platform.openai.com/docs/api-reference/files) IDs that
@@ -355,6 +370,13 @@ export interface ThreadCreateAndRunStreamParams {
    */
   model?: string | null;
 
+  /**
+   * What sampling temperature to use, between 0 and 2. Higher values like 0.8 will
+   * make the output more random, while lower values like 0.2 will make it more
+   * focused and deterministic.
+   */
+  temperature?: number | null;
+
   /**
    * If no thread is provided, an empty thread will be created.
    */
@@ -397,10 +419,14 @@ export namespace ThreadCreateAndRunStreamParams {
       content: string;
 
       /**
-       * The role of the entity that is creating the message. Currently only `user` is
-       * supported.
+       * The role of the entity that is creating the message. Allowed values include:
+       *
+       * - `user`: Indicates the message is sent by an actual user and should be used in
+       *   most cases to represent user-generated messages.
+       * - `assistant`: Indicates the message is generated by the assistant. Use this
+       *   value to insert messages from the assistant into the conversation.
        */
-      role: 'user';
+      role: 'user' | 'assistant';
 
       /**
        * A list of [File](https://platform.openai.com/docs/api-reference/files) IDs that
diff --git a/tests/api-resources/beta/threads/runs/runs.test.ts b/tests/api-resources/beta/threads/runs/runs.test.ts
index 5e1b363fd..5f17c1b58 100644
--- a/tests/api-resources/beta/threads/runs/runs.test.ts
+++ b/tests/api-resources/beta/threads/runs/runs.test.ts
@@ -28,6 +28,7 @@ describe('resource runs', () => {
       metadata: {},
       model: 'string',
       stream: false,
+      temperature: 1,
       tools: [{ type: 'code_interpreter' }, { type: 'code_interpreter' }, { type: 'code_interpreter' }],
     });
   });
diff --git a/tests/api-resources/beta/threads/threads.test.ts b/tests/api-resources/beta/threads/threads.test.ts
index 24cb815a7..3606019bd 100644
--- a/tests/api-resources/beta/threads/threads.test.ts
+++ b/tests/api-resources/beta/threads/threads.test.ts
@@ -109,6 +109,7 @@ describe('resource threads', () => {
       metadata: {},
       model: 'string',
       stream: false,
+      temperature: 1,
       thread: {
         messages: [
           { role: 'user', content: 'x', file_ids: ['string'], metadata: {} },