Óscar Fonseca 4a371d1d9f fix(usage): preserve nested cached_tokens in canonicalizeUsage ...

buildUsage() only emits cache reads under prompt_tokens_details, so the
top-level-only read dropped the count for every Responses-format provider
(codex, grok-cli, ...), persisting cached_tokens: 0 and billing cache hits
at the full input rate. Mirror the cache_creation fallback already used
just above.

2026-08-28 16:46:05 +07:00

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