diff --git a/.stats.yml b/.stats.yml
index 11d2b0b18..eb81a249f 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 64
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-0577fd0d08da6b867b002a5accd45f7116ef91c4940b41cf45dc479938c77163.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-ff436357b12348b7c1c930469332a79cd23ac6ec537e645c411893c42de42e57.yml
diff --git a/src/resources/beta/threads/runs/runs.ts b/src/resources/beta/threads/runs/runs.ts
index 9e44ccfe5..ed5a5ff68 100644
--- a/src/resources/beta/threads/runs/runs.ts
+++ b/src/resources/beta/threads/runs/runs.ts
@@ -402,6 +402,13 @@ export interface Run {
    */
   object: 'thread.run';
 
+  /**
+   * Whether to enable
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * during tool use.
+   */
+  parallel_tool_calls: boolean;
+
   /**
    * Details on the action required to continue the run. Will be `null` if no action
    * is required.
@@ -685,6 +692,13 @@ export interface RunCreateParamsBase {
     | 'gpt-3.5-turbo-16k-0613'
     | null;
 
+  /**
+   * Whether to enable
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * during tool use.
+   */
+  parallel_tool_calls?: boolean;
+
   /**
    * Specifies the format that the model must output. Compatible with
    * [GPT-4o](https://platform.openai.com/docs/models/gpt-4o),
diff --git a/src/resources/beta/threads/threads.ts b/src/resources/beta/threads/threads.ts
index 9d27b0328..6978e6eb5 100644
--- a/src/resources/beta/threads/threads.ts
+++ b/src/resources/beta/threads/threads.ts
@@ -560,6 +560,13 @@ export interface ThreadCreateAndRunParamsBase {
     | 'gpt-3.5-turbo-16k-0613'
     | null;
 
+  /**
+   * Whether to enable
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * during tool use.
+   */
+  parallel_tool_calls?: boolean;
+
   /**
    * Specifies the format that the model must output. Compatible with
    * [GPT-4o](https://platform.openai.com/docs/models/gpt-4o),
diff --git a/src/resources/chat/completions.ts b/src/resources/chat/completions.ts
index cbf7bcc2c..eeaab3d70 100644
--- a/src/resources/chat/completions.ts
+++ b/src/resources/chat/completions.ts
@@ -757,6 +757,13 @@ export interface ChatCompletionCreateParamsBase {
    */
   n?: number | null;
 
+  /**
+   * Whether to enable
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * during tool use.
+   */
+  parallel_tool_calls?: boolean;
+
   /**
    * Number between -2.0 and 2.0. Positive values penalize new tokens based on
    * whether they appear in the text so far, increasing the model's likelihood to
diff --git a/tests/api-resources/beta/threads/runs/runs.test.ts b/tests/api-resources/beta/threads/runs/runs.test.ts
index 3ee6ecb4e..5aba82ff8 100644
--- a/tests/api-resources/beta/threads/runs/runs.test.ts
+++ b/tests/api-resources/beta/threads/runs/runs.test.ts
@@ -124,6 +124,7 @@ describe('resource runs', () => {
       max_prompt_tokens: 256,
       metadata: {},
       model: 'gpt-4-turbo',
+      parallel_tool_calls: true,
       response_format: 'none',
       stream: false,
       temperature: 1,
diff --git a/tests/api-resources/beta/threads/threads.test.ts b/tests/api-resources/beta/threads/threads.test.ts
index ebc78f357..85f89533c 100644
--- a/tests/api-resources/beta/threads/threads.test.ts
+++ b/tests/api-resources/beta/threads/threads.test.ts
@@ -213,6 +213,7 @@ describe('resource threads', () => {
       max_prompt_tokens: 256,
       metadata: {},
       model: 'gpt-4-turbo',
+      parallel_tool_calls: true,
       response_format: 'none',
       stream: false,
       temperature: 1,
diff --git a/tests/api-resources/chat/completions.test.ts b/tests/api-resources/chat/completions.test.ts
index 21277e1d6..9404e9e18 100644
--- a/tests/api-resources/chat/completions.test.ts
+++ b/tests/api-resources/chat/completions.test.ts
@@ -34,6 +34,7 @@ describe('resource completions', () => {
       logprobs: true,
       max_tokens: 0,
       n: 1,
+      parallel_tool_calls: true,
       presence_penalty: -2,
       response_format: { type: 'json_object' },
       seed: -9223372036854776000,