https://platform.claude.com/docs/en/build-with-claude/fallback-credit https://platform.claude.com/docs/en/build-with-claude/fallba... Fable requests that fall

https://platform.claude.com/docs/en/build-with-claude/fallback-credit https://platform.claude.com/docs/en/build-with-claude/fallba... Fable requests that fall back to Opus do not charge the cache miss cost of Opus.