diff --git a/src/index.ts b/src/index.ts
index 65c0bc20..0976766d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,9 +1,9 @@
 // File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
-import * as Core from './core';
 import * as Errors from './error';
-import { type Agent } from './_shims/index';
 import * as Uploads from './uploads';
+import { type Agent } from './_shims/index';
+import * as Core from '@anthropic-ai/sdk/core';
 import * as API from '@anthropic-ai/sdk/resources/index';
 
 export interface ClientOptions {
@@ -74,7 +74,9 @@ export interface ClientOptions {
   defaultQuery?: Core.DefaultQuery;
 }
 
-/** API Client for interfacing with the Anthropic API. */
+/**
+ * API Client for interfacing with the Anthropic API.
+ */
 export class Anthropic extends Core.APIClient {
   apiKey: string | null;
   authToken: string | null;
@@ -114,6 +116,7 @@ export class Anthropic extends Core.APIClient {
       maxRetries: options.maxRetries,
       fetch: options.fetch,
     });
+
     this._options = options;
 
     this.apiKey = apiKey;
diff --git a/src/resources/completions.ts b/src/resources/completions.ts
index d8e810e2..fb3479a2 100644
--- a/src/resources/completions.ts
+++ b/src/resources/completions.ts
@@ -1,8 +1,8 @@
 // File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
-import * as Core from '@anthropic-ai/sdk/core';
-import { APIPromise } from '@anthropic-ai/sdk/core';
 import { APIResource } from '@anthropic-ai/sdk/resource';
+import { APIPromise } from '@anthropic-ai/sdk/core';
+import * as Core from '@anthropic-ai/sdk/core';
 import * as CompletionsAPI from '@anthropic-ai/sdk/resources/completions';
 import { Stream } from '@anthropic-ai/sdk/streaming';
 
diff --git a/src/resources/messages.ts b/src/resources/messages.ts
index 03497af4..6ce8623d 100644
--- a/src/resources/messages.ts
+++ b/src/resources/messages.ts
@@ -1,13 +1,14 @@
 // File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
-import * as Core from '@anthropic-ai/sdk/core';
-import { APIPromise } from '@anthropic-ai/sdk/core';
 import { APIResource } from '@anthropic-ai/sdk/resource';
+import { APIPromise } from '@anthropic-ai/sdk/core';
+import * as Core from '@anthropic-ai/sdk/core';
 import { MessageStream } from '@anthropic-ai/sdk/lib/MessageStream';
-export { MessageStream } from '@anthropic-ai/sdk/lib/MessageStream';
 import * as MessagesAPI from '@anthropic-ai/sdk/resources/messages';
 import { Stream } from '@anthropic-ai/sdk/streaming';
 
+export { MessageStream } from '@anthropic-ai/sdk/lib/MessageStream';
+
 export class Messages extends APIResource {
   /**
    * Create a Message.
diff --git a/tests/stringifyQuery.test.ts b/tests/stringifyQuery.test.ts
index 82320845..1fef3436 100644
--- a/tests/stringifyQuery.test.ts
+++ b/tests/stringifyQuery.test.ts
@@ -1,8 +1,10 @@
-import { APIClient } from '@anthropic-ai/sdk/core';
+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
-const { stringifyQuery } = APIClient.prototype as any;
+import { Anthropic } from '@anthropic-ai/sdk';
 
-describe('APIClient.stringifyQuery', () => {
+const { stringifyQuery } = Anthropic.prototype as any;
+
+describe(stringifyQuery, () => {
   for (const [input, expected] of [
     [{ a: '1', b: 2, c: true }, 'a=1&b=2&c=true'],
     [{ a: null, b: false, c: undefined }, 'a=&b=false'],
@@ -18,6 +20,7 @@ describe('APIClient.stringifyQuery', () => {
       expect(stringifyQuery(input)).toEqual(expected);
     });
   }
+
   for (const value of [[], {}, new Date()]) {
     it(`${JSON.stringify(value)} -> <error>`, () => {
       expect(() => stringifyQuery({ value })).toThrow(`Cannot stringify type ${typeof value}`);