diff --git a/src/transformers/pipelines/text_to_audio.py b/src/transformers/pipelines/text_to_audio.py
index be7a9b9bc0c8..9331d3365a3e 100644
--- a/src/transformers/pipelines/text_to_audio.py
+++ b/src/transformers/pipelines/text_to_audio.py
@@ -172,6 +172,11 @@ def preprocess(self, text, **kwargs):
                 **kwargs,
             )
         else:
+            # Add speaker ID if needed and user didn't insert at start of text
+            if self.model.config.model_type == "csm":
+                text = [f"[0]{t}" if not t.startswith("[") else t for t in text]
+            if self.model.config.model_type == "dia":
+                text = [f"[S1] {t}" if not t.startswith("[") else t for t in text]
             output = preprocessor(text, **kwargs, return_tensors="pt")
 
         return output
@@ -196,6 +201,12 @@ def _forward(self, model_inputs, **kwargs):
             # ensure dict output to facilitate postprocessing
             forward_params.update({"return_dict_in_generate": True})
 
+            if self.model.config.model_type in ["csm"]:
+                # NOTE (ebezzam): CSM does not have the audio tokenizer in the processor therefore `output_audio=True`
+                # needed for decoding to audio
+                if "output_audio" not in forward_params:
+                    forward_params["output_audio"] = True
+
             output = self.model.generate(**model_inputs, **forward_params)
         else:
             if len(generate_kwargs):
diff --git a/tests/pipelines/test_pipelines_text_to_audio.py b/tests/pipelines/test_pipelines_text_to_audio.py
index 19c7570e9e9d..8f8462b2288a 100644
--- a/tests/pipelines/test_pipelines_text_to_audio.py
+++ b/tests/pipelines/test_pipelines_text_to_audio.py
@@ -251,10 +251,10 @@ def test_generative_model_kwargs(self):
     @require_torch
     def test_csm_model_pt(self):
         speech_generator = pipeline(task="text-to-audio", model="sesame/csm-1b", device=torch_device)
-        generate_kwargs = {"max_new_tokens": 10, "output_audio": True}
+        generate_kwargs = {"max_new_tokens": 10}
         num_channels = 1  # model generates mono audio
 
-        outputs = speech_generator("[0]This is a test", generate_kwargs=generate_kwargs)
+        outputs = speech_generator("This is a test", generate_kwargs=generate_kwargs)
         self.assertEqual(outputs["sampling_rate"], 24000)
         audio = outputs["audio"]
         self.assertEqual(ANY(np.ndarray), audio)
@@ -262,7 +262,7 @@ def test_csm_model_pt(self):
         self.assertEqual(len(audio.shape), num_channels)
 
         # test two examples side-by-side
-        outputs = speech_generator(["[0]This is a test", "[0]This is a second test"], generate_kwargs=generate_kwargs)
+        outputs = speech_generator(["This is a test", "This is a second test"], generate_kwargs=generate_kwargs)
         audio = [output["audio"] for output in outputs]
         self.assertEqual([ANY(np.ndarray), ANY(np.ndarray)], audio)
         self.assertEqual(len(audio[0].shape), num_channels)
@@ -270,7 +270,7 @@ def test_csm_model_pt(self):
         # test batching
         batch_size = 2
         outputs = speech_generator(
-            ["[0]This is a test", "[0]This is a second test"], generate_kwargs=generate_kwargs, batch_size=batch_size
+            ["This is a test", "This is a second test"], generate_kwargs=generate_kwargs, batch_size=batch_size
         )
         self.assertEqual(len(outputs), batch_size)
         audio = [output["audio"] for output in outputs]
@@ -284,9 +284,7 @@ def test_dia_model(self):
         generate_kwargs = {"max_new_tokens": 20}
         num_channels = 1  # model generates mono audio
 
-        outputs = speech_generator(
-            "[S1] Dia is an open weights text to dialogue model.", generate_kwargs=generate_kwargs
-        )
+        outputs = speech_generator("Dia is an open weights text to dialogue model.", generate_kwargs=generate_kwargs)
         self.assertEqual(outputs["sampling_rate"], 44100)
         audio = outputs["audio"]
         self.assertEqual(ANY(np.ndarray), audio)
@@ -295,7 +293,7 @@ def test_dia_model(self):
 
         # test two examples side-by-side
         outputs = speech_generator(
-            ["[S1] Dia is an open weights text to dialogue model.", "[S2] This is a second example."],
+            ["Dia is an open weights text to dialogue model.", "This is a second example."],
             generate_kwargs=generate_kwargs,
         )
         audio = [output["audio"] for output in outputs]
@@ -305,7 +303,7 @@ def test_dia_model(self):
         # test batching
         batch_size = 2
         outputs = speech_generator(
-            ["[S1] Dia is an open weights text to dialogue model.", "[S2] This is a second example."],
+            ["Dia is an open weights text to dialogue model.", "This is a second example."],
             generate_kwargs=generate_kwargs,
             batch_size=2,
         )