diff --git a/test/lib/openai-mock-server.js b/test/lib/openai-mock-server.js
index a9237a504e..a679e4dca2 100644
--- a/test/lib/openai-mock-server.js
+++ b/test/lib/openai-mock-server.js
@@ -8,6 +8,7 @@
 module.exports = openaiMockServer
 
 const http = require('node:http')
+const { Readable } = require('node:stream')
 const RESPONSES = require('./openai-responses')
 
 /**
@@ -69,8 +70,44 @@ function handler(req, res) {
       res.setHeader(key, value)
     }
     res.statusCode = code
-    res.write(JSON.stringify(body))
-    res.end()
+
+    if (payload.stream === true) {
+      // OpenAI streamed responses are double newline delimited lines that
+      // are prefixed with the string `data: `. The end of the stream is
+      // terminated with a `done: [DONE]` string.
+      const parts = body.split(' ')
+      let i = 0
+      const outStream = new Readable({
+        read() {
+          if (i < parts.length) {
+            const content = parts.length - 1 === i ? parts[i] : `${parts[i]} `
+            const chunk = JSON.stringify({
+              id: 'chatcmpl-8MzOfSMbLxEy70lYAolSwdCzfguQZ',
+              object: 'chat.completion.chunk',
+              // 2023-11-20T09:00:00-05:00
+              created: 1700488800,
+              model: 'gpt-4',
+              choices: [
+                {
+                  index: 0,
+                  finish_reason: null,
+                  delta: { role: 'assistant', content }
+                }
+              ]
+            })
+            this.push(`data: ${chunk}\n\n`)
+            i += 1
+          } else {
+            this.push('data: [DONE]\n\n')
+            this.push(null)
+          }
+        }
+      })
+      outStream.pipe(res)
+    } else {
+      res.write(JSON.stringify(body))
+      res.end()
+    }
   })
 }
 
diff --git a/test/lib/openai-responses.js b/test/lib/openai-responses.js
index ca022ca5c5..6ab3024722 100644
--- a/test/lib/openai-responses.js
+++ b/test/lib/openai-responses.js
@@ -157,3 +157,22 @@ responses.set('You are a mathematician.', {
     usage: { completion_tokens: 11, prompt_tokens: 53, total_tokens: 64 }
   }
 })
+
+responses.set('Streamed response', {
+  headers: {
+    'Content-Type': 'text/event-stream',
+    'openai-model': 'gpt-3.5-turbo-0613',
+    'openai-organization': 'new-relic-nkmd8b',
+    'openai-processing-ms': '1469',
+    'openai-version': '2020-10-01',
+    'x-ratelimit-limit-requests': '200',
+    'x-ratelimit-limit-tokens': '40000',
+    'x-ratelimit-remaining-requests': '199',
+    'x-ratelimit-remaining-tokens': '39940',
+    'x-ratelimit-reset-requests': '7m12s',
+    'x-ratelimit-reset-tokens': '90ms',
+    'x-request-id': '49dbbffbd3c3f4612aa48def69059aad'
+  },
+  code: 200,
+  body: "A streamed response is a way of transmitting data from a server to a client (e.g. from a website to a user's computer or mobile device) in a continuous flow or stream, rather than all at one time. This means the client can start to process the data before all of it has been received, which can improve performance for large amounts of data or slow connections. Streaming is often used for real-time or near-real-time applications like video or audio playback."
+})