Comment by gpugreg

We can at least put an upper limit on it. From https://www.anthropic.com/glasswing

    Claude Mythos Preview will be available to participants at $25/$125 per million input/output tokens
    ...
    Anthropic is committing up to $100M in usage credits for Mythos Preview

Although I'd expect reduced prices for cached tokens, which is not mentioned on their website at this point in time.