Getting 4.1 responses when trying to use 5.1 | OpenAI | Page 1

Reported by @bold dawn

Bug Report: Getting 4.1 responses when trying to use 5.1

`Steps to Reproduce`

i'm doing a
curl --request POST
--url https://api.openai.com/v1/responses
--header 'Content-type: application/json'
--header "Authorization: Bearer $OPENAI_API_KEY"
--data '{
"model": "gpt-5.1-2025-11-13",
"input": "What type of model were you trained on? and whats your knowledge cutoff"
}'

`Expected Result`

an answer that says is gp5.1 and a recent model knowledge cutoff

`Actual Result`

I'm getting a response that is labeled as gpt5.1 but the model answer is saying is gpt4.1 and a old knowledge cutoff. Request id resp_0bde5288ef235ddc01691b37426a4c81979421acbb227b322f

`Environment`

cli api

#Getting 4.1 responses when trying to use 5.1