claude-opus-5-5 on the Claude Platform; Claude Sonnet 5.5 and Claude Haiku 5.5 "will follow in the coming weeks"[1]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.
Unlike the Fable 5.1 announcement, this page dates itself: the header reads “Claude[2] Opus 5.5 September 22, 2026”. TechCrunch's[3] byline (“9:30 AM PDT · September 22, 2026”, “released on Tuesday”) and XDA's 2026-09-22T16:44Z timestamp agree, so the source keeps the claim and the two reports corroborate it.
Anthropic's[1] Claude Opus 5.5 model page lists a 1M-token context window, 128K max output (300K Batch beta), adaptive thinking always on with medium default effort, and a Jun 2026 knowledge cutoff.
TechCrunch's same-day report by Russell Brandom, bylined “9:30 AM PDT · September 22, 2026” and saying the model “was released on Tuesday”. It supplies the Opus 5 comparison prices ($25 per million output tokens) that the announcement states only as a percentage.
XDA's report, timestamped 2026-09-22T16:44Z, independently confirms the launch day and gives both old prices in full - “Claude[2] Opus 5 costs $5 for 1 million input tokens and $25 for 1 million output tokens” against $4 and $20.
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