'concise' reasoning summary returns null since March 27

Welcome to the dev community @JD42

According to docs:

Different models support different reasoning summary settings. For example, our computer use model supports the concise summarizer, while o4-mini supports detailed. To access the most detailed summarizer available for a model, set the value of this parameter to auto. auto will be equivalent to detailed for most reasoning models today, but there may be more granular settings in the future.