Seeing the word "null" showing up in the middle of certain Assistant responses

We’ve started seeing the word “null” starting to show up from time to time in the middle of certain textual responses – e.g., inside a section heading. Ours is a RAG application built on top of the Assistants API. We’ve double-checked and can say that the word “null” never shows up anywhere in our RAG (vector store) content.

Has anyone else seen these kind of nulls?

Interestingly, we have also implemented the Responses API on top of the same vector store. We are not seeing anything similar via that API.

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Yes, same here.
It says null over the most important parts.

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We’re seeing this a bunch too, even in the playground. Assistants API is completely broken and usable currently.

Here are some threads for the OpenAI staff to investigate further:
https://platform.openai.com/assistants/thread_WxDDVWF95H2kjsYogl0SahWm
https://platform.openai.com/assistants/thread_rngP0aByAw2RgMtZbRVUY8ae
https://platform.openai.com/assistants/thread_oFNPayCVDRAHX6OoJ4BXS3jr
https://platform.openai.com/assistants/thread_IYrlC9bUnnKenKocM1puFMTc
https://platform.openai.com/assistants/thread_LbVYHURutLnWStuaMc2jhBQA
https://platform.openai.com/assistants/thread_HWszOxiToeEb4Z2DGf8zIdqO
https://platform.openai.com/assistants/thread_uXDdGkob991TTvmLlH1N6891
https://platform.openai.com/assistants/thread_NB3y3zelorqLnd8aZ9AtWSRv
https://platform.openai.com/assistants/thread_AYbfM7fGW83e3bRmM7lGOSfV

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Assistants are broken, return “null” all over the place in their response text. Has been ongoing for over a month now, see:

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Thanks for raising this. I’ve flagged this to the team, we’ll update back here once there’s an update!

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i observed the same behaviour and checked the messages via the api, because the results where correct even with the “missing” Informations.In the messages the complete text was there and not replaced by nulls.

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This same issue has been happening to me for a couple of months if not longer. Some days it seems to be worse than others. I’d love to find a solution to this as it makes all of my Assistants worthless.

I’m experiencing the same problem, and it has been getting worse lately.

Any updates, this issue is affecting our workflow.