How to get access to GPT Custom model for Japanese?

I noticed a Custom Model for Japanese is releasing ( Introducing OpenAI Japan | OpenAI). Are there any way to get access to the model for trial? Thanks

From a news article back in April:

In addition, at the same time as opening the Japan office, the company also announced that a “GPT-4 custom model” optimized for Japanese will be released within a few months.

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