alt Hacker NewsJudging from their site, I think it should be OK:
"You won't be charged Fable prices for rerouted requests. Learn more about how the fallback experience works."
https://www.anthropic.com/claude/fable Under "Safeguards"
Replies
bel8 • today at 7:47 PM
And what happens if you also get blocked by Opus?
I couldn't find if they refund the tokens for that session or the customer is SOL.
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This has no mention of what happens to the prompt cache, including the "learn more" link.
Knowing Anthropic, it wouldn't surprise me if it will result in a full cache miss/rewrite at fallback, with potentially up to 1M tokens in the context window.