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Concepts are deprecated and have been replaced by Topics. The concepts endpoints remain functional but will not receive updates.
Concepts were a hierarchical taxonomy of research areas derived from Wikidata. They have been replaced by the Topics system, which provides more accurate and comprehensive classification.

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Filter, sort, and group_by fields

The API supports filtering, sorting, and grouping on concepts fields. See Filtering, Sorting, and Grouping for syntax. Fields marked (deprecated) are .search filters — use the search parameter instead.
FieldSortGroup_byFilter
ancestors.id✓✓✓
cited_by_count✓✓✓
default.search (deprecated)✓
display_name✓✓
display_name.search (deprecated)✓
from_created_date✓✓
has_wikidata✓✓✓
ids.openalex✓✓✓
level✓✓✓
openalex✓✓✓
openalex_id✓✓
summary_stats.2yr_mean_citedness✓✓
summary_stats.h_index✓✓
summary_stats.i10_index✓✓
wikidata_id✓✓
works_count✓✓✓