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][3] own model release notes date this entry March 5, 2026
OpenAI's[1][3] API model page for GPT-5.4 calls it "a flagship model for complex professional work" and lists a 1,050,000 context window, 128,000 max output tokens, $2.50/$15 per 1M tokens and 2x/1.5x pricing for prompts over 272K tokens.
OpenAI[1][2] staff announcement in the developer community, posted the day GPT-5.4 Thinking launched.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.
