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Subfields are the third level of the OpenAlex topic hierarchy. There are 254 subfields spread across 26 fields. Each subfield contains multiple topics. The topic hierarchy is: Domain → Field → Subfield → Topic

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Filter, sort, and group_by fields

The API supports filtering, sorting, and grouping on subfields fields. See Filtering, Sorting, and Grouping for syntax. Fields marked (deprecated) are .search filters — use the search parameter instead.
FieldSortGroup_byFilter
cited_by_count✓✓✓
default.search (deprecated)✓
display_name✓✓
display_name.search (deprecated)✓
domain.id✓✓✓
field.id✓✓✓
from_created_date✓✓
id✓✓✓
topics.id✓✓✓
works_count✓✓✓