OpenAI o3 · model releaseo3

validasserted

Valid from: 2025-04-16
Valid until: still holds
Published: 2025-04-16
Recorded by AsOf: 2026-11-04
Checked: 2026-11-04 · its source page states the value and the date
Confidence: 0.95

Sources

“Apr 16 Feature v1/chat/completions v1/responses Added two new o-series reasoning models, o3 and o4-mini .”— what the page says, read 2026-11-04

OpenAI API changelog, April 16, 2025primary · developers.openai.com · 2025-04-16

/claim/clm_5B364764E97C.md /v1/claims/clm_5B364764E97C timeline submit a correction