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Anthropic added a line to its own change log that was not there before, reading "Introducing Claude Sonnet 5.5".

AnthropicCHANGELOGADDEDMON SEP 28, 18:20

The line, as the page carries it

+Introducing Claude Sonnet 5.5

The record

DOCUMENThttps://www.anthropic.com/news
SOURCEanthropic-news
ROWIntroducing Claude Sonnet 5.5
OPERATIONadded
BEFORENothing was recorded because the row did not exist.
AFTERIntroducing Claude Sonnet 5.5
READ AT2026-09-28T18:20:05.066Z
SIGNALSmodelId, capability

What went out

    When a lab changes a document

    The engine refetches every registered document on a schedule and files the line that moved. Model cards, system cards, pricing pages, API changelogs and deprecation notices all change without an announcement. Leave an address and Context Window writes when one does.