Address gaps found in adversarial verification of the in-flight balance
reservation:
- Early release: the reservation is now a ref-counted handle carried on the
request context. Billing tasks submitted via submit*UsageRecordTask take a
ref and return it only after RecordUsage has run; with reservation enabled
the balance cache is deducted synchronously inside the billing task, so the
reservation is released only after admission can see the deduction. Dropped
tasks return their ref immediately. The reservation is renewed every ttl/3
while the handler runs; after the handler returns it is no longer renewed,
so the post-handler hold is bounded by one TTL.
- Estimate: use the same billing model (channel mapping + BillingModelSource,
max over requested/mapped when ambiguous) and ModelPricingResolver (group
ModelPricing incl. wildcards, channel per_request/image/video/token
overrides), default/group/user rate + peak multiplier, plus image, video,
audio and search surcharge kinds. Unpriced requests fail open with a
throttled log; new billing.inflight_reservation.fail_closed_on_unpriced
(default false) rejects them instead.
- Wire images, embeddings, web/x search, alpha search, grok media generation,
grok realtime/voice, OpenAI-platform /v1/messages and ResponsesWebSocket
(session-level reservation with renewal).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
