gpt-5 from openai does not work for the chat

[hputz]

When i change the config.toml to:

[model.chat.http]
kind = "openai/chat"
model_name = "gpt-5"
api_endpoint = "https://api.openai.com/v1"
api_key = {my-key}

The chat always shows bad_request for each chat message. With gpt-4.1 it does work. I cannot find any additional information in the log even with debug enabled.

I'm on version 0.31.0

I used the api with gpt-5 in my own project and it does work, it is slow but it can reply.