Anthropic rolls out a fast mode for Claude Opus 4.6 in research preview, saying it offers the same model quality 2.5 times faster but costs six times more (Simon Willison/Simon Willison's Weblog)

Simon Willison / Simon Willison's Weblog: Anthropic rolls out a fast mode for Claude Opus 4.6 in research preview, saying it offers the same model quality 2.5 times faster but costs six times more   —  Opus is usually $5/million input and $25/million output.  The new fast mode is $30/million input and $150/million output!