As adamk said, the radeonhd driver is no longer developed.. but OpenBSD contains both an older radeon driver along with radeonhd, at one point the radeonhd driver supported newer GPU chipsets but that is no longer the case.
There are some problems preventing the upgrade of the radeon driver in OpenBSD, so both drivers are kept.. but eventually when the radeon driver gets updated, I suspect the radeonhd driver will be removed.
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