Monitoring changedmonitoring-usage
Upstream edited this page at 28 Oct 2026 19:51 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 28 Oct 2026 20:07 UTC.
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857857* `output_tokens`: Number of output tokens
858858* `cache_read_tokens`: Number of tokens read from cache
859859* `cache_creation_tokens`: Number of tokens used for cache creation
860* `cache_creation_5m_tokens`, `cache_creation_1h_tokens`: the number of tokens the API response reports as written to the cache with a five-minute [cache lifetime](https://code.claude.com/docs/en/prompt-caching.md#cache-lifetime) and the number written with a one-hour lifetime. Both are `0` when the API response doesn't report them, even when `cache_creation_tokens` is above zero. Requires Claude Code v2.1.300 or later
860861* `request_id`: API request ID, such as `"req_011..."`, described under [Event correlation attributes](#event-correlation-attributes).
861862* `client_request_id`: Client-generated UUID sent as the `x-client-request-id` request header; see the [event correlation attributes](#event-correlation-attributes) table for when it's present
862863* `speed`: `"fast"` or `"normal"`, indicating whether fast mode was active
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