diff --git a/docs-website/scripts/test_python_snippets.py b/docs-website/scripts/test_python_snippets.py
index 3a524f59df..662232523f 100755
--- a/docs-website/scripts/test_python_snippets.py
+++ b/docs-website/scripts/test_python_snippets.py
@@ -331,12 +331,25 @@ def run_snippet(snippet: Snippet, timeout_seconds: int, cwd: str, skip_unsafe: b
             stderr=completed.stderr,
         )
     except subprocess.TimeoutExpired as exc:
+        # Handle stderr which might be bytes or str
+        stderr_text = exc.stderr
+        if stderr_text is None:
+            stderr_text = ""
+        elif isinstance(stderr_text, bytes):
+            stderr_text = stderr_text.decode("utf-8", errors="replace")
+        stderr_text = stderr_text + f"\n[timeout after {timeout_seconds}s]"
+
+        # Handle stdout which might be bytes or str
+        stdout_text = exc.stdout
+        if stdout_text is not None and isinstance(stdout_text, bytes):
+            stdout_text = stdout_text.decode("utf-8", errors="replace")
+
         return ExecutionResult(
             snippet=snippet,
             status=ExecutionStatus.FAILED,
             reason=f"timeout after {timeout_seconds}s",
-            stdout=exc.stdout or None,
-            stderr=(exc.stderr or "") + f"\n[timeout after {timeout_seconds}s]",
+            stdout=stdout_text,
+            stderr=stderr_text,
         )
 
 
@@ -414,7 +427,7 @@ def main(argv: Optional[list[str]] = None) -> int:
             "(defaults to docs and versioned_docs)"
         ),
     )
-    parser.add_argument("--timeout-seconds", type=int, default=30, help="Timeout per snippet execution (seconds)")
+    parser.add_argument("--timeout-seconds", type=int, default=600, help="Timeout per snippet execution (seconds)")
     parser.add_argument(
         "--allow-unsafe", action="store_true", help="Allow execution of snippets with potentially unsafe patterns"
     )
diff --git a/haystack/components/audio/whisper_local.py b/haystack/components/audio/whisper_local.py
index 66bf2a3d0d..bb7a963612 100644
--- a/haystack/components/audio/whisper_local.py
+++ b/haystack/components/audio/whisper_local.py
@@ -46,7 +46,7 @@ class LocalWhisperTranscriber:
 
     whisper = LocalWhisperTranscriber(model="small")
     whisper.warm_up()
-    transcription = whisper.run(sources=["path/to/audio/file"])
+    transcription = whisper.run(sources=["test/test_files/audio/answer.wav"])
     ```
     """
 
diff --git a/haystack/components/audio/whisper_remote.py b/haystack/components/audio/whisper_remote.py
index b8ff4f19fc..83593aebb8 100644
--- a/haystack/components/audio/whisper_remote.py
+++ b/haystack/components/audio/whisper_remote.py
@@ -30,9 +30,10 @@ class RemoteWhisperTranscriber:
 
     ```python
     from haystack.components.audio import RemoteWhisperTranscriber
+    from haystack.utils import Secret
 
-    whisper = RemoteWhisperTranscriber(api_key=Secret.from_token("<your-api-key>"), model="tiny")
-    transcription = whisper.run(sources=["path/to/audio/file"])
+    whisper = RemoteWhisperTranscriber(api_key=Secret.from_env_var("OPENAI_API_KEY"), model="whisper-1")
+    transcription = whisper.run(sources=["test/test_files/audio/answer.wav"])
     ```
     """
 
diff --git a/haystack/components/builders/chat_prompt_builder.py b/haystack/components/builders/chat_prompt_builder.py
index aba2780fa7..2d5f6a56f1 100644
--- a/haystack/components/builders/chat_prompt_builder.py
+++ b/haystack/components/builders/chat_prompt_builder.py
@@ -75,7 +75,7 @@ class ChatPromptBuilder:
 
     # no parameter init, we don't use any runtime template variables
     prompt_builder = ChatPromptBuilder()
-    llm = OpenAIChatGenerator(api_key=Secret.from_token("<your-api-key>"), model="gpt-4o-mini")
+    llm = OpenAIChatGenerator(api_key=Secret.from_env_var("OPENAI_API_KEY"), model="gpt-5-mini")
 
     pipe = Pipeline()
     pipe.add_component("prompt_builder", prompt_builder)
@@ -90,27 +90,17 @@ class ChatPromptBuilder:
     res = pipe.run(data={"prompt_builder": {"template_variables": {"location": location, "language": language},
                                         "template": messages}})
     print(res)
+    # Output example (truncated):
+    # {'llm': {'replies': [ChatMessage(...)]}}
 
-    >> {'llm': {'replies': [ChatMessage(_role=<ChatRole.ASSISTANT: 'assistant'>, _content=[TextContent(text=
-    "Berlin is the capital city of Germany and one of the most vibrant
-    and diverse cities in Europe. Here are some key things to know...Enjoy your time exploring the vibrant and dynamic
-    capital of Germany!")], _name=None, _meta={'model': 'gpt-4o-mini',
-    'index': 0, 'finish_reason': 'stop', 'usage': {'prompt_tokens': 27, 'completion_tokens': 681, 'total_tokens':
-    708}})]}}
-
-    messages = [system_message, ChatMessage.from_user("What's the weather forecast for {{location}} in the next
-    {{day_count}} days?")]
+    messages = [system_message, ChatMessage.from_user("What's the forecast for {{location}}, next {{day_count}} days?")]
 
     res = pipe.run(data={"prompt_builder": {"template_variables": {"location": location, "day_count": "5"},
                                         "template": messages}})
 
     print(res)
-    >> {'llm': {'replies': [ChatMessage(_role=<ChatRole.ASSISTANT: 'assistant'>, _content=[TextContent(text=
-    "Here is the weather forecast for Berlin in the next 5
-    days:\\n\\nDay 1: Mostly cloudy with a high of 22°C (72°F) and...so it's always a good idea to check for updates
-    closer to your visit.")], _name=None, _meta={'model': 'gpt-4o-mini',
-    'index': 0, 'finish_reason': 'stop', 'usage': {'prompt_tokens': 37, 'completion_tokens': 201,
-    'total_tokens': 238}})]}}
+    # Output example (truncated):
+    # {'llm': {'replies': [ChatMessage(...)]}}
     ```
 
     #### String prompt template
@@ -131,7 +121,8 @@ class ChatPromptBuilder:
     {% endmessage %}
     \"\"\"
 
-    images = [ImageContent.from_file_path("apple.jpg"), ImageContent.from_file_path("orange.jpg")]
+    images = [ImageContent.from_file_path("test/test_files/images/apple.jpg"),
+              ImageContent.from_file_path("test/test_files/images/haystack-logo.png")]
 
     builder = ChatPromptBuilder(template=template)
     builder.run(user_name="John", images=images)