diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 999cfc01c..74af4d46e 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.49.0"
+  ".": "4.49.1"
 }
diff --git a/.stats.yml b/.stats.yml
index eb81a249f..a6c08f499 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-ff436357b12348b7c1c930469332a79cd23ac6ec537e645c411893c42de42e57.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-c085faf70d6ff059fbe11b7b6b98123a612524cb9b8a6f649c99526e5b0b1bdb.yml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8853010a9..d0f49f420 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 4.49.1 (2024-06-07)
+
+Full Changelog: [v4.49.0...v4.49.1](https://github.com/openai/openai-node/compare/v4.49.0...v4.49.1)
+
+### Bug Fixes
+
+* remove erroneous thread create argument ([#889](https://github.com/openai/openai-node/issues/889)) ([a9f898e](https://github.com/openai/openai-node/commit/a9f898ee109a0b35a672e41c6497f3a75eff7734))
+
 ## 4.49.0 (2024-06-06)
 
 Full Changelog: [v4.48.3...v4.49.0](https://github.com/openai/openai-node/compare/v4.48.3...v4.49.0)
diff --git a/README.md b/README.md
index acd36e4d1..61c0b2697 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ You can import in Deno via:
 <!-- x-release-please-start-version -->
 
 ```ts
-import OpenAI from 'https://deno.land/x/openai@v4.49.0/mod.ts';
+import OpenAI from 'https://deno.land/x/openai@v4.49.1/mod.ts';
 ```
 
 <!-- x-release-please-end -->
diff --git a/package.json b/package.json
index 5a116918d..f75c903c4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openai",
-  "version": "4.49.0",
+  "version": "4.49.1",
   "description": "The official TypeScript library for the OpenAI API",
   "author": "OpenAI <support@openai.com>",
   "types": "dist/index.d.ts",
diff --git a/scripts/build-deno b/scripts/build-deno
index 460fead2b..73f54338d 100755
--- a/scripts/build-deno
+++ b/scripts/build-deno
@@ -16,7 +16,7 @@ This is a build produced from https://github.com/openai/openai-node – please g
 Usage:
 
 \`\`\`ts
-import OpenAI from "https://deno.land/x/openai@v4.49.0/mod.ts";
+import OpenAI from "https://deno.land/x/openai@v4.49.1/mod.ts";
 
 const client = new OpenAI();
 \`\`\`
diff --git a/src/resources/beta/threads/messages.ts b/src/resources/beta/threads/messages.ts
index a5307edbe..4bbdc7426 100644
--- a/src/resources/beta/threads/messages.ts
+++ b/src/resources/beta/threads/messages.ts
@@ -459,7 +459,16 @@ export namespace Message {
     /**
      * The tools to add this file to.
      */
-    tools?: Array<AssistantsAPI.CodeInterpreterTool | AssistantsAPI.FileSearchTool>;
+    tools?: Array<AssistantsAPI.CodeInterpreterTool | Attachment.AssistantToolsFileSearchTypeOnly>;
+  }
+
+  export namespace Attachment {
+    export interface AssistantToolsFileSearchTypeOnly {
+      /**
+       * The type of tool being defined: `file_search`
+       */
+      type: 'file_search';
+    }
   }
 
   /**
@@ -637,7 +646,16 @@ export namespace MessageCreateParams {
     /**
      * The tools to add this file to.
      */
-    tools?: Array<AssistantsAPI.CodeInterpreterTool | AssistantsAPI.FileSearchTool>;
+    tools?: Array<AssistantsAPI.CodeInterpreterTool | Attachment.FileSearch>;
+  }
+
+  export namespace Attachment {
+    export interface FileSearch {
+      /**
+       * The type of tool being defined: `file_search`
+       */
+      type: 'file_search';
+    }
   }
 }
 
diff --git a/src/resources/beta/threads/runs/runs.ts b/src/resources/beta/threads/runs/runs.ts
index ed5a5ff68..0cc7e35d1 100644
--- a/src/resources/beta/threads/runs/runs.ts
+++ b/src/resources/beta/threads/runs/runs.ts
@@ -404,7 +404,7 @@ export interface Run {
 
   /**
    * Whether to enable
-   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling/parallel-function-calling)
    * during tool use.
    */
   parallel_tool_calls: boolean;
@@ -694,7 +694,7 @@ export interface RunCreateParamsBase {
 
   /**
    * Whether to enable
-   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling/parallel-function-calling)
    * during tool use.
    */
   parallel_tool_calls?: boolean;
@@ -806,7 +806,16 @@ export namespace RunCreateParams {
       /**
        * The tools to add this file to.
        */
-      tools?: Array<AssistantsAPI.CodeInterpreterTool | AssistantsAPI.FileSearchTool>;
+      tools?: Array<AssistantsAPI.CodeInterpreterTool | Attachment.FileSearch>;
+    }
+
+    export namespace Attachment {
+      export interface FileSearch {
+        /**
+         * The type of tool being defined: `file_search`
+         */
+        type: 'file_search';
+      }
     }
   }
 
diff --git a/src/resources/beta/threads/threads.ts b/src/resources/beta/threads/threads.ts
index 6978e6eb5..441bbe41c 100644
--- a/src/resources/beta/threads/threads.ts
+++ b/src/resources/beta/threads/threads.ts
@@ -323,7 +323,16 @@ export namespace ThreadCreateParams {
       /**
        * The tools to add this file to.
        */
-      tools?: Array<AssistantsAPI.CodeInterpreterTool | AssistantsAPI.FileSearchTool>;
+      tools?: Array<AssistantsAPI.CodeInterpreterTool | Attachment.FileSearch>;
+    }
+
+    export namespace Attachment {
+      export interface FileSearch {
+        /**
+         * The type of tool being defined: `file_search`
+         */
+        type: 'file_search';
+      }
     }
   }
 
@@ -562,7 +571,7 @@ export interface ThreadCreateAndRunParamsBase {
 
   /**
    * Whether to enable
-   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling/parallel-function-calling)
    * during tool use.
    */
   parallel_tool_calls?: boolean;
@@ -717,7 +726,16 @@ export namespace ThreadCreateAndRunParams {
         /**
          * The tools to add this file to.
          */
-        tools?: Array<AssistantsAPI.CodeInterpreterTool | AssistantsAPI.FileSearchTool>;
+        tools?: Array<AssistantsAPI.CodeInterpreterTool | Attachment.FileSearch>;
+      }
+
+      export namespace Attachment {
+        export interface FileSearch {
+          /**
+           * The type of tool being defined: `file_search`
+           */
+          type: 'file_search';
+        }
       }
     }
 
diff --git a/src/resources/chat/completions.ts b/src/resources/chat/completions.ts
index eeaab3d70..b7c301f4e 100644
--- a/src/resources/chat/completions.ts
+++ b/src/resources/chat/completions.ts
@@ -759,7 +759,7 @@ export interface ChatCompletionCreateParamsBase {
 
   /**
    * Whether to enable
-   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling)
+   * [parallel function calling](https://platform.openai.com/docs/guides/function-calling/parallel-function-calling)
    * during tool use.
    */
   parallel_tool_calls?: boolean;
diff --git a/src/version.ts b/src/version.ts
index bb12aad49..7df786cb2 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '4.49.0'; // x-release-please-version
+export const VERSION = '4.49.1'; // x-release-please-version