The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
OpenAI's[2] own model release notes date this entry April 29, 2025
OpenAI's[1] announcement post, linked from the release note entry.
TechCrunch reports the rollback the day OpenAI[1][2] announced it.
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