As with Opus 4.6, using the beta 1M context window incurs a 2x input cost and 1.5x output cost when going over >200K tokens: https://platform.claude.com/docs/en/about-claude/pricing
Opus 4.6 in Claude Code has been absolutely lousy with solving problems within its current context limit so if Sonnet 4.6 is able to do long-context problems (which would be roughly the same price of base Opus 4.6), then that may actually be a game changer.
> Opus 4.6 in Claude Code has been absolutely lousy with solving problems
Can you share your prompts and problems?
You cut out the "within its current context limit" phrase. It solves the problems, just often with 1% or 0% context limit left and it makes me sweat.
Why? You can use the fast version to directly skip to compact! /s