docs(telemetry): add Anthropic prompt caching spec and conformance tests#13
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Andrew Kent (realark) merged 1 commit intomainfrom Apr 30, 2026
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Document how Braintrust SDKs surface Anthropic's prompt caching usage, including the 5m/1h TTL breakdown that drives differing cache-write pricing. Add llm_span conformance fixtures for both the default 5m TTL (no beta header) and the extended 1h TTL (extended-cache-ttl-2025-04-11 beta) so SDK implementations can be validated end-to-end.
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Andrew Kent (realark)
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Apr 21, 2026
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note: Can only be merged after https://github.com/braintrustdata/braintrust/pull/12968 is merged and deployed. |
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BE work here: https://github.com/braintrustdata/braintrust/pull/13295/ |
Abhijeet Prasad (AbhiPrasad)
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May 1, 2026
Surface Anthropic cache_creation TTL buckets as Braintrust span metrics for 5m and 1h prompt-cache writes while preserving the aggregate cache creation total for legacy cost paths. Add focused VCR-backed coverage for both default 5m caching and the extended 1h beta header. ref braintrustdata/braintrust-spec#13 dependent on braintrustdata/braintrust#12968 being merged
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Document how Braintrust SDKs surface Anthropic's prompt caching usage, including the 5m/1h TTL breakdown that drives differing cache-write pricing. Add llm_span conformance fixtures for both the default 5m TTL (no beta header) and the extended 1h TTL (extended-cache-ttl-2025-04-11 beta) so SDK implementations can be validated end-to-end.