gpt 5 mini reasoning effort option

What reasoning_effort options are officially supported for the GPT-5-mini model in Azure OpenAI?

I tested the following values:

• none
• minimal
• low
• medium
• high

All requests were accepted successfully.

However, both none and minimal resulted in reasoning_tokens = 0, so it's unclear whether minimal is actually supported or just treated the same as none.

Could you clarify:

1. Which reasoning_effort values are officially supported for GPT-5-mini?
2. Is minimal a valid supported option?
3. If supported, should minimal produce reasoning tokens different from none?