What changed
No action needed unless you validate responses against a closed schema.
Affects ResponseUsage reachable from 4 operations.
Who is affected
Code that reads OpenAI's ResponseUsage objects, used by 4 OpenAI operations.
Before and after
| Where | Before | After |
|---|---|---|
| ResponseUsage.input_tokens_details.cache_write_tokens_details | absent | present |
Based on OpenAI’s published API specification. How severity is decided.