OptionaldefaultOptionalonCalled when the model string matches no built-in prefix and no override. The estimator falls back to the naive 4.0 ratio when this fires.
OptionalopaqueInput-token surcharge for opaque (non-text) content blocks (v3.7).
Without this, opaque blocks contribute 0 input tokens — an image-heavy request estimates as nearly free, which is the wrong direction for admission control. A flat conservative number (e.g. 2048 per block) or a per-type map converts each opaque block into a fixed reservation. Validated at estimator creation. Omitted: surcharge disabled (previous behavior).
OptionaloutputFallback output reservation when request.max_tokens is absent.
Default: 2048.
Model string used for ratio lookup when the request does not carry its own
modelfield. Should match themodelfield on the owningLLMBulkhead.