Marks the exact end of a reusable prompt prefix. When ttl is omitted, the breakpoint inherits the request’s prompt_cache_options.ttl; the boundary is not rounded to a token block.
mode: Literal["explicit"]
The breakpoint mode. Always explicit.
ttl: Optional[Literal["30m", "12h"]]
The minimum lifetime of this cache breakpoint. Defaults to the request TTL.