OpenAI publicly released GPT-4 on March 14, 2023.

OpenAI publicly released GPT-4 on March 14, 2023, according to primary documentation and independent news reports. The rollout continued into March 15, with some articles dated that day reflecting publication timing rather than a different release date.

The Short Version Reliable primary documentation and independent news reporting confirm that OpenAI released GPT-4 in March 2023. Most sources identify March 14 as the announcement and initial rollout date; reporting dated March 15 reflects publication timing or the continuing rollout, not a substantive contradiction.