AssemblyAI · devin-ai-integration · Mar 25, 2026 · Mar 25, 2026 · Mar 26, 2026
diff --git a/fern/docs.yml b/fern/docs.yml
@@ -358,9 +358,6 @@ navigation:
             href: /docs/medical-scribe-best-practices
           - link: Build a contact center application
             href: /docs/contact-center-best-practices
-          - page: Apply LLMs to pre-recorded audio
-            path: pages/lemur/apply-llms-to-audio-files.mdx
-            slug: /apply-llms-to-audio-files
           - page: Overview
             path: pages/guides/pre-recorded.mdx
             slug: /pre-recorded-audio

diff --git a/fern/pages/guides/cookbooks/core-transcription/SDK-Node-batch.mdx b/fern/pages/guides/cookbooks/core-transcription/SDK-Node-batch.mdx
@@ -53,7 +53,8 @@ Next, we'll create a promise that will submit the file path for transcription. M
 const getTranscript = (filePath) => new Promise((resolve, reject) => {
   client.transcripts.transcribe({
     audio: filePath,
-    language_detection: true
+    language_detection: true,
+    speech_models: ["universal-3-pro", "universal-2"]
   })
   .then(result => resolve(result))
   .catch(error => reject(error));
@@ -124,6 +125,7 @@ const getTranscript = (filePath) => new Promise((resolve, reject) => {
   client.transcripts.transcribe({
     audio: filePath,
     language_detection: true,
+    speech_models: ["universal-3-pro", "universal-2"],
   })
   .then(result => resolve(result))
   .catch(error => reject(error));

diff --git a/fern/pages/guides/cookbooks/core-transcription/audio-duration-fix.mdx b/fern/pages/guides/cookbooks/core-transcription/audio-duration-fix.mdx
@@ -11,6 +11,7 @@ import assemblyai as aai
 import subprocess
 
 aai.settings.api_key = "YOUR_API_KEY"
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 
 def get_duration_ffprobe(file_path):
@@ -66,7 +67,7 @@ def check_audio_durations(file_path):
 
 def transcribe(file):
     print("Executing transcription as audio durations are consistent.")
-    transcript = transcriber.transcribe(file)
+    transcript = transcriber.transcribe(file, config)
     print(transcript.text)
 
 def transcode(input_file, output_file):
@@ -146,6 +147,7 @@ import assemblyai as aai
 import subprocess
 
 aai.settings.api_key = "YOUR_API_KEY"
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 ```
 
@@ -225,7 +227,7 @@ Define the `transcribe` function. This will run only when the duration is consis
 ```python
 def transcribe(file):
     print("Executing transcription as audio durations are consistent.")
-    transcript = transcriber.transcribe(file)
+    transcript = transcriber.transcribe(file, config)
     print(transcript.text)
 ```
 

diff --git a/...ooks/core-transcription/automatic-language-detection-route-default-language.mdx b/...ooks/core-transcription/automatic-language-detection-route-default-language.mdx
@@ -71,14 +71,15 @@ const params = {
   audio: audioUrl,
   language_detection: true,
   language_confidence_threshold: 0.8,
+  speech_models: ["universal-3-pro", "universal-2"],
   // Add any other params
 };
 ```
 
 ```python
 transcriber = aai.Transcriber()
 audio_url = ("https://example.org/audio.mp3")
-config = aai.TranscriptionConfig(language_detection=True, language_confidence_threshold=0.8)
+config = aai.TranscriptionConfig(language_detection=True, language_confidence_threshold=0.8, speech_models=["universal-3-pro", "universal-2"])
 transcript = transcriber.transcribe(audio_url, config)
 ```
 
@@ -151,7 +152,7 @@ run(params);
 if transcript.error:
     if "below the requested confidence threshold value" in transcript.error:
         print(f"{transcript.error}. Running transcript again with language set to '{default_language}'.")
-        new_config = aai.TranscriptionConfig(language_code=default_language)
+        new_config = aai.TranscriptionConfig(language_code=default_language, speech_models=["universal-3-pro", "universal-2"])
         transcript = transcriber.transcribe(audio_url, new_config)
         print(f"Transcript ID: {transcript.id}")
         print(transcript.text)

diff --git a/fern/pages/guides/cookbooks/core-transcription/batch_transcription.mdx b/fern/pages/guides/cookbooks/core-transcription/batch_transcription.mdx
@@ -15,11 +15,12 @@ aai.settings.api_key = "YOUR_API_KEY"
 batch_folder = "audio"
 transcription_result_folder = "transcripts"
 
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 
 def transcribe_audio(audio_file):
     transcriber = aai.Transcriber()
-    transcript = transcriber.transcribe(os.path.join(batch_folder, audio_file))
+    transcript = transcriber.transcribe(os.path.join(batch_folder, audio_file), config)
     if transcript.status == "completed":
         with open(f"{transcription_result_folder}/{audio_file}.txt", "w") as f:
             f.write(transcript.text)
@@ -77,8 +78,9 @@ Function to transcribe an audio file. Once the transcript is complete, a .txt fi
 
 ```python
 def transcribe_audio(audio_file):
+    config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
     transcriber = aai.Transcriber()
-    transcript = transcriber.transcribe(os.path.join(batch_folder, audio_file))
+    transcript = transcriber.transcribe(os.path.join(batch_folder, audio_file), config)
     if transcript.status == "completed":
         with open(f"{transcription_result_folder}/{audio_file}.txt", "w") as f:
             f.write(transcript.text)

diff --git a/fern/pages/guides/cookbooks/core-transcription/detecting-low-confidence-words.mdx b/fern/pages/guides/cookbooks/core-transcription/detecting-low-confidence-words.mdx
@@ -27,6 +27,7 @@ Next create the transcript with your audio file, either via local audio file or
 ```javascript
 const transcript = await client.transcripts.transcribe({
   audio_url: "./sample.mp4",
+  speech_models: ["universal-3-pro", "universal-2"],
 });
 ```
 

diff --git a/fern/pages/guides/cookbooks/core-transcription/gradio-frontend.mdx b/fern/pages/guides/cookbooks/core-transcription/gradio-frontend.mdx
@@ -28,8 +28,9 @@ assemblyai.settings.api_key = "API_KEY_HERE"
 
 
 def transcribe(audio_path):
+    config = assemblyai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
     transcriber = assemblyai.Transcriber()
-    transcript = transcriber.transcribe(audio_path)
+    transcript = transcriber.transcribe(audio_path, config)
 
     if transcript.status == assemblyai.TranscriptStatus.error:
         print(f"Transcription failed: {transcript.error}")

diff --git a/fern/pages/guides/cookbooks/core-transcription/identify_duplicate_channels.mdx b/fern/pages/guides/cookbooks/core-transcription/identify_duplicate_channels.mdx
@@ -119,13 +119,14 @@ updated_path = convert_to_mono_if_duplicate(original_path)
 # Check if we modified the file and thus appended _mono to it.
 if updated_path != original_path:
     # Use the default configuration, which will treat the file as mono, which it now is.
-    transcriber = aai.Transcriber()
+    config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
+    transcriber = aai.Transcriber(config=config)
 
     # Transcribe our new mono file.
     print(transcriber.transcribe(updated_path).text)
 else:
     # Submit the file as Multi Channel if the content wasn't the same.
-    config = aai.TranscriptionConfig(multichannel=True)
+    config = aai.TranscriptionConfig(multichannel=True, speech_models=["universal-3-pro", "universal-2"])
 
     # Load the config into our Transcriber.
     transcriber = aai.Transcriber(config=config)

diff --git a/fern/pages/guides/cookbooks/core-transcription/retry-server-error.mdx b/fern/pages/guides/cookbooks/core-transcription/retry-server-error.mdx
@@ -40,7 +40,7 @@ def handle_error_transcription(audio_url, transcriber, config, retries=1, wait_t
 
 audio_url = "YOUR_AUDIO_URL"
 transcriber = aai.Transcriber()
-config = aai.TranscriptionConfig()
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 
 transcript = handle_error_transcription(audio_url, transcriber, config, retries=1, wait_time=5)
 if transcript:
@@ -99,7 +99,7 @@ Create a `Transcriber` object and specify features in `TranscriptionConfig`.
 
 ```python
 transcriber = aai.Transcriber()
-config = aai.TranscriptionConfig()
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 ```
 
 Call the function to handle transcription with error handling. Specify number of retries and wait time. Return the transcribed text if transcription is successful.

diff --git a/fern/pages/guides/cookbooks/core-transcription/retry-upload-error.mdx b/fern/pages/guides/cookbooks/core-transcription/retry-upload-error.mdx
@@ -23,7 +23,7 @@ def transcribe_with_upload_retry(file_path, retries=3, delay=5):
     for attempt in range(retries):
         try:
             # Attempt to transcribe the file
-            config = aai.TranscriptionConfig(speaker_labels=True)
+            config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
             transcript = transcriber.transcribe(file_path, config)
             return transcript
 
@@ -76,7 +76,7 @@ def transcribe_with_upload_retry(file_path, retries=3, delay=5):
     for attempt in range(retries):
         try:
             # Attempt to transcribe the file
-            config = aai.TranscriptionConfig(speaker_labels=True)
+            config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
             transcript = transcriber.transcribe(file_path, config)
             return transcript
 

diff --git a/fern/pages/guides/cookbooks/core-transcription/schedule_delete.mdx b/fern/pages/guides/cookbooks/core-transcription/schedule_delete.mdx
@@ -21,8 +21,9 @@ aai.settings.api_key = "YOUR_ASSEMBLYAI_API_KEY"
 EASYCRON_API_TOKEN = "YOUR_EASYCRON_API_KEY"
 
 # Create transcriber instance and transcribe audio
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
-transcript = transcriber.transcribe('https://assembly.ai/sports_injuries.mp3')
+transcript = transcriber.transcribe('https://assembly.ai/sports_injuries.mp3', config)
 
 # Get the transcript ID
 transcript_id = transcript.id
@@ -80,10 +81,11 @@ aai.settings.api_key = f"{YOUR_API_KEY}"
 ```
 
 ```python
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 
 # this is just an example file
-transcript = transcriber.transcribe('https://assembly.ai/sports_injuries.mp3')
+transcript = transcriber.transcribe('https://assembly.ai/sports_injuries.mp3', config)
 ```
 
 Store the transcript ID

diff --git a/fern/pages/guides/cookbooks/core-transcription/speaker_labelled_subtitles.mdx b/fern/pages/guides/cookbooks/core-transcription/speaker_labelled_subtitles.mdx
@@ -10,7 +10,7 @@ import assemblyai as aai
 # SETTINGS
 aai.settings.api_key = "YOUR-API-KEY"
 filename = "YOUR-FILE-NAME"
-transcriber = aai.Transcriber(config=aai.TranscriptionConfig(speaker_labels=True))
+transcriber = aai.Transcriber(config=aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"]))
 transcript = transcriber.transcribe(filename)
 
 # Maximum number of words per subtitle
@@ -97,7 +97,7 @@ import assemblyai as aai
 # SETTINGS
 aai.settings.api_key = "YOUR-API-KEY"
 filename = "YOUR-FILE-NAME"
-transcriber = aai.Transcriber(config=aai.TranscriptionConfig(speaker_labels=True))
+transcriber = aai.Transcriber(config=aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"]))
 transcript = transcriber.transcribe(filename)
 
 # Maximum number of words per subtitle

diff --git a/fern/pages/guides/cookbooks/core-transcription/speaker_timeline.mdx b/fern/pages/guides/cookbooks/core-transcription/speaker_timeline.mdx
@@ -12,7 +12,7 @@ import matplotlib.pyplot as plt
 
 aai.settings.api_key = "YOUR_API_KEY"
 
-config = aai.TranscriptionConfig(speaker_labels=True)
+config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 transcript = transcriber.transcribe("./my-audio.mp3", config)
 utterances = transcript.utterances
@@ -65,7 +65,7 @@ aai.settings.api_key = "YOUR_API_KEY"
 Create a `TranscriptionConfig` object and set speaker labels to `True`.
 
 ```python
-config = aai.TranscriptionConfig(speaker_labels=True)
+config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
 ```
 
 Create a `Transcriber` object.

diff --git a/fern/pages/guides/cookbooks/core-transcription/subtitle_creation_by_word_count.mdx b/fern/pages/guides/cookbooks/core-transcription/subtitle_creation_by_word_count.mdx
@@ -13,9 +13,10 @@ import assemblyai as aai
 
 aai.settings.api_key = "YOUR-API-KEY"
 
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 
-transcript = transcriber.transcribe("./my-audio.mp3")
+transcript = transcriber.transcribe("./my-audio.mp3", config)
 
 def second_to_timecode(x: float) -> str:
     hour, x = divmod(x, 3600)
@@ -75,19 +76,20 @@ aai.settings.api_key = "YOUR-API-KEY"
 Create a Transcriber object.
 
 ```python
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 ```
 
 Use the Transcriber object's transcribe method and pass in the audio file's path as a parameter. The transcribe method saves the results of the transcription to the Transcriber object's transcript attribute.
 
 ```python
-transcript = transcriber.transcribe("./my-audio.mp3")
+transcript = transcriber.transcribe("./my-audio.mp3", config)
 ```
 
 Alternatively, you can pass in the URL of the publicly accessible audio file on the internet.
 
 ```python
-transcript = transcriber.transcribe("https://storage.googleapis.com/aai-docs-samples/espn.m4a")
+transcript = transcriber.transcribe("https://storage.googleapis.com/aai-docs-samples/espn.m4a", config)
 ```
 
 Define a function that converts seconds to timecodes

diff --git a/fern/pages/guides/cookbooks/core-transcription/subtitles.mdx b/fern/pages/guides/cookbooks/core-transcription/subtitles.mdx
@@ -59,19 +59,20 @@ aai.settings.api_key = "YOUR_API_KEY"
 Create a `Transcriber` object.
 
 ```python
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
 ```
 
 Use the `Transcriber` object's `transcribe` method and pass in the audio file's path as a parameter. The `transcribe` method saves the results of the transcription to the `Transcriber` object's `transcript` attribute.
 
 ```python
-transcript = transcriber.transcribe("./my-audio.mp3")
+transcript = transcriber.transcribe("./my-audio.mp3", config)
 ```
 
 Alternatively, you can pass in the URL of the publicly accessible audio file on the internet.
 
 ```python
-transcript = transcriber.transcribe("https://example.org/audio.mp3")
+transcript = transcriber.transcribe("https://example.org/audio.mp3", config)
 ```
 
 Export SRT subtitles with the `export_subtitles_srt` method.

diff --git a/fern/pages/guides/cookbooks/core-transcription/talk-listen-ratio.mdx b/fern/pages/guides/cookbooks/core-transcription/talk-listen-ratio.mdx
@@ -52,7 +52,7 @@ def calculate_talk_listen_ratios(transcript):
 
 transcriber = aai.Transcriber()
 audio_url = ("YOUR_AUDIO_URL")
-config = aai.TranscriptionConfig(speaker_labels=True)
+config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
 transcript = transcriber.transcribe(audio_url, config)
 
 talk_listen_stats = calculate_talk_listen_ratios(transcript)
@@ -128,7 +128,7 @@ Define a `transcriber`, an `audio_url` set to a link to the audio file (replace
 ```python
 transcriber = aai.Transcriber()
 audio_url = ("https://api.assemblyai-solutions.com/storage/v1/object/public/dual-channel-phone-data/Fisher_Call_Centre/audio05851.wav")
-config = aai.TranscriptionConfig(speaker_labels=True)
+config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])
 transcript = transcriber.transcribe(audio_url, config)
 
 talk_listen_stats = calculate_talk_listen_ratios(transcript)

diff --git a/fern/pages/guides/cookbooks/core-transcription/titanet-speaker-identification.mdx b/fern/pages/guides/cookbooks/core-transcription/titanet-speaker-identification.mdx
@@ -31,7 +31,7 @@ pc = Pinecone(api_key="PINECONE_KEY_HERE")
 aai.settings.api_key = "AAI_KEY_HERE"
 
 def transcribe(file_url):
-    config = aai.TranscriptionConfig(speaker_labels=True)  # Speaker labels must be enabled for this Cookbook.
+    config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])  # Speaker labels must be enabled for this Cookbook.
 
     transcriber = aai.Transcriber(config=config)
 
@@ -348,7 +348,7 @@ aai.settings.api_key = "AAI_KEY_HERE"
 
 
 def transcribe(file_url):
-    config = aai.TranscriptionConfig(speaker_labels=True)  # Speaker labels must be enabled for this Cookbook.
+    config = aai.TranscriptionConfig(speaker_labels=True, speech_models=["universal-3-pro", "universal-2"])  # Speaker labels must be enabled for this Cookbook.
 
     transcriber = aai.Transcriber(config=config)
 

diff --git a/fern/pages/guides/cookbooks/core-transcription/traditional_simplified_chinese.mdx b/fern/pages/guides/cookbooks/core-transcription/traditional_simplified_chinese.mdx
@@ -18,7 +18,7 @@ aai.settings.api_key = "<YOUR-API-KEY>"
 
 audio_file = "https://assembly.ai/chinese-interview.mp4"
 
-config = aai.TranscriptionConfig(language_code="zh")
+config = aai.TranscriptionConfig(language_code="zh", speech_models=["universal-3-pro", "universal-2"])
 
 transcript = aai.Transcriber(config=config).transcribe(audio_file)
 
@@ -59,7 +59,7 @@ Specify your audio source and create a configuration for Chinese language transc
 ```python
 audio_file = "https://assembly.ai/chinese-interview.mp4"
 
-config = aai.TranscriptionConfig(language_code="zh")
+config = aai.TranscriptionConfig(language_code="zh", speech_models=["universal-3-pro", "universal-2"])
 
 transcript = aai.Transcriber(config=config).transcribe(audio_file)
 ```

diff --git a/fern/pages/guides/cookbooks/core-transcription/transcribe_from_s3.mdx b/fern/pages/guides/cookbooks/core-transcription/transcribe_from_s3.mdx
@@ -113,7 +113,7 @@ headers = {"authorization": assembly_key, "content-type": "application/json"}
 transcript_endpoint = "https://api.assemblyai.com/v2/transcript"
 
 # Use the presigned URL as the `audio_url` in the POST request.
-json = {"audio_url": p_url}
+json = {"audio_url": p_url, "speech_models": ["universal-3-pro", "universal-2"]}
 
 # Queue the audio file for transcription with a POST request.
 post_response = requests.post(transcript_endpoint, json=json, headers=headers)

diff --git a/fern/pages/guides/cookbooks/core-transcription/transcribe_youtube_videos.mdx b/fern/pages/guides/cookbooks/core-transcription/transcribe_youtube_videos.mdx
@@ -53,8 +53,9 @@ def transcribe_youtube_video(video_url: str, api_key: str) -> str:
     aai.settings.api_key = api_key
 
     # Transcribe the downloaded audio file
+    config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
     transcriber = aai.Transcriber()
-    transcript = transcriber.transcribe(f"{video_id}.m4a")
+    transcript = transcriber.transcribe(f"{video_id}.m4a", config)
 
     return transcript.text
 
@@ -101,8 +102,9 @@ import assemblyai as aai
 
 aai.settings.api_key = "YOUR_API_KEY"
 
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
-transcript = transcriber.transcribe("wtolixa9XTg.m4a")
+transcript = transcriber.transcribe("wtolixa9XTg.m4a", config)
 print(transcript.text)
 ```
 
@@ -138,6 +140,7 @@ import assemblyai as aai
 
 aai.settings.api_key = "YOUR_API_KEY"
 
+config = aai.TranscriptionConfig(speech_models=["universal-3-pro", "universal-2"])
 transcriber = aai.Transcriber()
-transcript = transcriber.transcribe("wtolixa9XTg.m4a")
+transcript = transcriber.transcribe("wtolixa9XTg.m4a", config)
 ```