When calling the Responses API with a valid conversation (string or { id }) and background:true, the request completes but the “user input” and “assistant output” are not appended to that conversation. If I change only background to false, the items are appended as expected. Environment (my setup) …

Hi there! I just pushed a fix for this today, so conversations should now get items from responses when run in background mode. Please let me know here if you are still seeing issues, and thanks for your patience on our delay in fixing this issue!

/v1/responses with background:true does not append I/O to conversation (works when background:false)

API Bugs

wilkes September 12, 2025, 10:32pm 8

Okay, the issue with background + streaming should now be fixed. Let me know if you see any more edge cases, happy to address. Thank you.

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Conversation items not added when using streamed Response

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/v1/responses with background:true does not append I/O to conversation (works when background:false)

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