IAB Content Taxonomy 3.1 and GARM: what the source files show about 2026 ad standards

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The current IAB Content Taxonomy is version 3.1, released in December 2024, and it contains 704 categories. Moving from 3.0 requires only a version label change, since every 3.0 ID also exists in 3.1, though the new Thriller genre is an exception. Compatibility problems arise from the cattax field in OpenRTB, where sending the wrong taxonomy value can misread category IDs. The GARM coalition shut down in August 2024 without naming a successor, and its benchmark has not been updated since 2022, so claims of GARM alignment are not independently certified. The author, who works at Mixpeek, a vendor that sells classification services, advises buyers to confirm which taxonomy version and tier depth a classifier actually returns.

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