References 391% CONFIDENCEOverall confidence: 91%How well the pin's source and references back up its dates.Weighted average of how firmly 3 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 better

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.

• [1]95%
  OpenAI Model Release Notes: GPT-5.4 Thinking in ChatGPT (March 5, 2026)

  help.openai.com· Posted Sep 19, 2026· Starts Mar 5, 2026· 40% of score

  OpenAI's^[2][3] own model release notes date this entry March 5, 2026

• [2]90%
  GPT-5.4 Model | OpenAI API

  developers.openai.com· Added Sep 22, 2026· 41% of score

  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.

• [3]85%
  GPT-5.4 Pro and Thinking are here!

  community.openai.com· Published Mar 5, 2026· Starts Mar 5, 2026· 19% of score

  OpenAI^[1][2] staff announcement in the developer community, posted the day GPT-5.4 Thinking launched.

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