diff --git a/packages/neuri/src/openai-xsai/messages.ts b/packages/neuri/src/openai-xsai/messages.ts
index 788e1e6..cdb2671 100644
--- a/packages/neuri/src/openai-xsai/messages.ts
+++ b/packages/neuri/src/openai-xsai/messages.ts
@@ -21,34 +21,10 @@ export function imagePart(imageUrl: string): ImagePart {
   return { type: 'image_url', image_url: { url: imageUrl } }
 }
 
-// TODO: AssistantMessage
-// interface ToolCallMessage {
-//   function: {
-//     arguments: string
-//     name: string
-//   }
-//   id: string
-//   type: 'function'
-// }
-// export function assistant(toolCall: ToolCallMessage | undefined): { role: 'assistant', tool_calls: ToolCallMessage[], name?: string }
-// export function assistant(message: string): { role: 'assistant', content: string, name?: string }
-// export function assistant(body: string | ToolCallMessage | undefined): AssistantMessage {
-//   if (body == null)
-//     return { role: 'assistant', content: '' }
-//   if (typeof body === 'string')
-//     return { role: 'assistant', content: body }
-
-//   return { role: 'assistant', tool_calls: [body] }
-// }
-
-// export function tool<P = any, R = any>(message: string, toolCall: ResolvedToolCall<P, R>): OpenAI.ChatCompletionToolMessageParam {
-//   return {
-//     role: 'tool',
-//     content: message,
-//     tool_call_id: toolCall.toolCall.id,
-//   }
-// }
-
 export function messages(...messages: Message[]): Message[] {
   return messages
 }
+
+export function assistant(message: string): AssistantMessage {
+  return { role: 'assistant', content: message }
+}
diff --git a/packages/neuri/src/openai-xsai/stream.test.ts b/packages/neuri/src/openai-xsai/stream.test.ts
index b92f7ba..5d21543 100644
--- a/packages/neuri/src/openai-xsai/stream.test.ts
+++ b/packages/neuri/src/openai-xsai/stream.test.ts
@@ -1,5 +1,4 @@
 import { env } from 'node:process'
-import { createOpenAI } from '@xsai/providers'
 import { describe, expect, it } from 'vitest'
 import { messages, system, user } from './messages'
 import { createOpenAIProvider } from './provider'
@@ -40,16 +39,11 @@ describe('stream', () => {
   // TODO: auto tee?
   it('should stream chunkStream', async () => {
     const apiKey = env.OPENAI_API_KEY || env.VITE_OPENAI_API_KEY
-    let baseURL = env.OPENAI_API_BASEURL || env.VITE_OPENAI_API_BASEURL
+    const baseURL = env.OPENAI_API_BASEURL || env.VITE_OPENAI_API_BASEURL
     expect(apiKey).toBeDefined()
     expect(baseURL).toBeDefined()
 
-    if (!baseURL?.endsWith('/')) {
-      baseURL += '/'
-    }
-
-    // TODO: fix baseURL
-    const openAI = createOpenAI({
+    const openAI = createOpenAIProvider({
       apiKey: apiKey!,
       baseURL: baseURL!,
     })