thinking-steering-and-cost changedbuild-with-claude/thinking-steering-and-cost
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890890To see how many billed output tokens were spent on internal reasoning, read `usage.output_tokens_details.thinking_tokens` in the response. This value reflects the raw reasoning the model generated (not the summarized text returned in the body) and is always less than or equal to `output_tokens`. Subtract it from `output_tokens` to approximate the non-reasoning portion of the output. When streaming, this breakdown appears only on the final `message_delta` event.
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892```text wrap
892```json
893893{
894894 "usage": {
895895 "input_tokens": 25,
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