Vision Capabilities

I asked vapi assistant to analyze the image in the attached knowledgebase. (1st page of a pdf). A few days ago it worked perfectly. But now it cannot see the image. Is this due to a recent update? I tried it on ui as well as on API. My client wants to have this feature in their system. You already had it a few days ago, but not now. Kindly let me know how to access models with vision support.
Thanks in advance.
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