Here is OpenAI code example for dealing with annotations, adding them as footnotes.
https://platform.openai.com/docs/assistants/how-it-works/message-annotations
If you want them gone, you can just eliminate the contents of response message within the Japanese brackets with a regex or pattern match in your code.
Here’s some quickie code for an idea.
import re
message_text = ("This is a sample text【9†source】 with source "
"tags using annotations【10†source】and some other content.")
# Use re.sub() to remove the matched source
# tags and their contents
pattern = r'【\d+†source】'
cleaned_text = re.sub(pattern, '', message_text)
print(cleaned_text)
You might need to close up extra spaces depending on where they appear if your renderer doesn’t already not show extra white space.