InstructGPT (January 2022 API-default announcement)
ClosedAnnounced, no public access
OpenAI announced InstructGPT as its default API model set on January 27, 2022. This is a dated default-model announcement after an earlier beta, not the first API-access date or an identified checkpoint.
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Historical model-set announcement. The January 27 post says InstructGPT was becoming the default API choice following an earlier beta. First API availability, exact beta start, checkpoints, later availability and retirement remain unknown in this slice.