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)

Anthropic's Claude Opus 4.6 now has a fast mode, offering the same quality 2.5 times faster. The fast mode costs $30/million input and $150/million output. This is six times more expensive than the standard mode, which costs $5/million input and $25/million output.