References 390% CONFIDENCEOverall confidence: 90%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%
  Claude Opus 4.8

  anthropic.com· Posted Sep 19, 2026· Starts May 28, 2026· 33% of score

  Anthropic's^[3] own announcement, dated the day the model became available.

• [2]90%
  Claude Opus 4.8 - Claude Platform Docs

  platform.claude.com· Added Sep 22, 2026· 34% of score

  Anthropic's^[1][3] Claude Opus 4.8 model page lists a 1M-token context window, 128K max output tokens, adaptive thinking with high default effort, and a Jan 2026 reliable knowledge cutoff.

• [3]85%
  Claude Opus \ Anthropic

  anthropic.com· Added Sep 19, 2026· Starts May 28, 2026· 33% of score

  Anthropic's^[1] Claude^[2] Opus page lists this announcement and its date.

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