What happened?

Running minimax/minimax-m2.5:free on OpenRouter provider gives the error:

Error: 400 Provider returned error
{"error":{"message":"Failed to deserialize the
JSON body into the target type:
messages[0].role: unknown variant developer,
expected one of system, user, assistant,
tool at line 1 column
119","type":"invalid_request_error"}}

Steps to reproduce

1. Select the model minimax/minimax-m2.5:free on OpenRouter Provider.
2. Send a message to the model

Expected behavior

Model responds to the chat input without any error message

Version

No response