I’ve noticed an inconsistency in how citations are returned when performing file search with GPT-4.1-mini.
When using the file search feature through the OpenAI Playground with GPT-4.1-mini, the model returns references like this:
【4:11†5.【000100451】.pdf】
These raw citation markers appear in the response, but no structured annotations object is included in the API response — unlike GPT-4 or GPT-4o, which usually return a well-formed annotations array alongside the output.