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Devika Verma
a990f6872f
Any model routed through /v1/responses (gpt-5.6+ with tools, i.e. the default gpt-5.6-sol) reported 0 tokens for every call: both AssistantTurn constructions omitted usage while every sibling adapter populated TokenUsage. First consumer to notice was the Auto-Approve reviewer metering; the 2026-08-13 eval report printed 'Tokens: 0 in / 0 out' across ~40 live calls. _usage_from maps the Responses shape like the Chat Completions adapter: fresh input = input_tokens - cached_tokens (input_tokens is INCLUSIVE of the cached share), cached share -> cache_read, output_tokens as-is (reasoning already included). Defensive reads: compat servers may omit input_tokens_details; a missing usage object stays None, never a fake zero. Wired in _parse_response, which both complete() and the stream's terminal response.completed event flow through - one extraction, both paths. Tests: cache split, partial/missing degradation, stream terminal event, stream-without-terminal stays None. Verified live against gpt-5.6-sol: call 1 'in=1820 cache_read=0', call 2 'in=3 cache_read=1817' - the 0-token era ends and the cache split reports correctly.