GPT-5.4 mini Comes to ChatGPT
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins89% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or betterOpenAI's[1][2][3] own model release notes date this entry March 18, 2026
OpenAI rolls out GPT-5.4 mini in ChatGPT for Free and Go users through the Thinking feature, and as a rate-limit fallback for GPT-5.4 Thinking.