OmniRoute's calculateCost() always estimated request cost from token
counts x static pricing, discarding xAI's exact provider-reported cost
when present. xAI's chat-completions usage object reports the precise
billed cost via cost_in_usd_ticks (docs.x.ai/developers/cost-tracking
and the API reference's usage schema: "TICKS_IN_USD_CENT: i64 =
100_000_000" => 1e10 ticks/USD, e.g. 37756000 ticks ~= $0.0038).
calculateCost()/computeCostFromPricing() now short-circuit to this
exact figure when present -- before any pricing DB lookup, so it also
works for models without a local pricing row -- and still fall back to
the token-based estimate when it is absent. The field is threaded
through both the streaming (extractUsage/normalizeUsage) and
non-streaming (extractUsageFromResponse) usage-extraction paths.
Corrected divisor vs upstream: the upstream PR used /1e12 (a 100x
under-report, e.g. reporting $0.00123 as the doc's $0.123 example);
this port uses the doc-verified /1e10 instead, confirmed against both
the cost-tracking guide and the API reference's usage-object schema.
Inspired-by: https://github.com/decolua/9router/pull/2453
Co-authored-by: ryanngit <74137224+ryanngit@users.noreply.github.com>
427ee244a3