diff --git a/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.test.ts b/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.test.ts
index dfc6811168c8a..7769dd8592faf 100644
--- a/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.test.ts
+++ b/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.test.ts
@@ -274,18 +274,22 @@ describe('OpenAIConnector', () => {
     });
 
     describe('invokeStream', () => {
-      let stream;
+      const mockStream = (
+        dataToStream: string[] = [
+          'data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"}}]}',
+        ]
+      ) => {
+        const streamMock = createStreamMock();
+        dataToStream.forEach((chunk) => {
+          streamMock.write(chunk);
+        });
+        streamMock.complete();
+        mockRequest = jest.fn().mockResolvedValue({ ...mockResponse, data: streamMock.transform });
+        return mockRequest;
+      };
       beforeEach(() => {
-        const chunk1 =
-          'data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"}}]}';
-
-        stream = createStreamMock();
-        stream.write(chunk1);
-        // .write(`data: ${JSON.stringify(mockResponse.data)}`);
-        mockRequest = jest.fn().mockResolvedValue({ ...mockResponse, data: stream.transform });
         // @ts-ignore
-        connector.request = mockRequest;
-        stream.complete();
+        connector.request = mockStream();
       });
 
       it('the API call is successful with correct request parameters', async () => {
@@ -312,6 +316,8 @@ describe('OpenAIConnector', () => {
       });
 
       it('transforms the response into a string', async () => {
+        // @ts-ignore
+        connector.request = mockStream();
         const response = await connector.invokeStream(sampleOpenAiBody);
 
         let responseBody: string = '';
@@ -323,17 +329,11 @@ describe('OpenAIConnector', () => {
         });
       });
       it('correctly buffers stream of json lines', async () => {
-        stream = createStreamMock();
-        const chunk1 =
-          'data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"}}]}';
-        const chunk2 =
-          '\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" message"}}]}\ndata: [DONE]';
-
-        stream.write(chunk1);
-        stream.write(chunk2);
-        mockRequest = jest.fn().mockResolvedValue({ ...mockResponse, data: stream.transform });
+        const chunk1 = `data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"}}]}`;
+        const chunk2 = `\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" message"}}]}\ndata: [DONE]`;
+
         // @ts-ignore
-        connector.request = mockRequest;
+        connector.request = mockStream([chunk1, chunk2]);
 
         const response = await connector.invokeStream(sampleOpenAiBody);
 
@@ -346,17 +346,12 @@ describe('OpenAIConnector', () => {
         });
       });
       it('correctly buffers partial lines', async () => {
-        stream = createStreamMock();
-        const chunk1 =
-          'data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"';
-        const chunk2 =
-          '}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" message"}}]}\ndata: [DONE]';
-
-        stream.write(chunk1);
-        stream.write(chunk2);
-        mockRequest = jest.fn().mockResolvedValue({ ...mockResponse, data: stream.transform });
+        const chunk1 = `data: {"object":"chat.completion.chunk","choices":[{"delta":{"content":"My"}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" new"`;
+
+        const chunk2 = `}}]}\ndata: {"object":"chat.completion.chunk","choices":[{"delta":{"content":" message"}}]}\ndata: [DONE]`;
+
         // @ts-ignore
-        connector.request = mockRequest;
+        connector.request = mockStream([chunk1, chunk2]);
 
         const response = await connector.invokeStream(sampleOpenAiBody);
 
@@ -706,7 +701,7 @@ function createStreamMock() {
 
   return {
     write: (data: string) => {
-      transform.push(`${data}\n`);
+      transform.push(data);
     },
     fail: () => {
       transform.emit('error', new Error('Stream failed'));
diff --git a/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.ts b/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.ts
index 4f839b2730f7f..78fca4bd84198 100644
--- a/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.ts
+++ b/x-pack/plugins/stack_connectors/server/connector_types/openai/openai.ts
@@ -238,46 +238,35 @@ export class OpenAIConnector extends SubActionConnector<Config, Secrets> {
 const transformToString = () => {
   let lineBuffer: string = '';
   const decoder = new TextDecoder();
-  const encoder = new TextEncoder();
 
   return new Transform({
     transform(chunk, encoding, callback) {
       const chunks = decoder.decode(chunk);
       const lines = chunks.split('\n');
-      if (lines[lines.length - 1] === '') {
-        lines.pop();
-      }
       lines[0] = lineBuffer + lines[0];
       lineBuffer = lines.pop() || '';
-      const nextChunk = lines
-        .map((str) => str.substring(6))
-        .filter((str) => !!str && str !== '[DONE]')
-        .map((line) => {
-          const openaiResponse = JSON.parse(line);
-          return openaiResponse.choices[0]?.delta.content ?? '';
-        })
-        .join('');
-      const newChunk = encoder.encode(nextChunk);
-      callback(null, newChunk);
+      callback(null, getNextChunk(lines));
     },
     flush(callback) {
       // Emit an additional chunk with the content of lineBuffer if it has length
       if (lineBuffer.length > 0) {
-        const nextChunk = [lineBuffer]
-          .map((str) => str.substring(6))
-          .filter((str) => !!str && str !== '[DONE]')
-          .map((line) => {
-            const openaiResponse = JSON.parse(line);
-            return openaiResponse.choices[0]?.delta.content ?? '';
-          })
-          .join('');
-        const newChunk = encoder.encode(nextChunk);
-        callback(null, newChunk);
-        // const additionalChunk = encoder.encode(lineBuffer);
-        // callback(null, additionalChunk);
+        callback(null, getNextChunk([lineBuffer]));
       } else {
         callback();
       }
     },
   });
 };
+
+const getNextChunk = (lines: string[]) => {
+  const encoder = new TextEncoder();
+  const nextChunk = lines
+    .map((str) => str.substring(6))
+    .filter((str) => !!str && str !== '[DONE]')
+    .map((line) => {
+      const openaiResponse = JSON.parse(line);
+      return openaiResponse.choices[0]?.delta.content ?? '';
+    })
+    .join('');
+  return encoder.encode(nextChunk);
+};