{"schema_version":"kingy-change-evidence-v1","event":{"id":"ct-c92e5503796ae598b9c1c95b","vendor":"Anthropic","category":"pricing","type":"documented_source_change","title":"Claude prompt cache policy and minimums documentation changed","source_id":"anthropic-cache","source_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","observed_at":"2026-10-21T20:55:11Z","last_unchanged_at":"2026-10-21T18:50:10Z","before_snapshot":"snap-aadba0c39e22d9f851cb313ca4f8","after_snapshot":"snap-4e581f9a21039263e13dc9a18d1e","before_hash":"9e6f93274ddc0ef1a8915a420e68e1d89e9767c0b0f121402ca26cbc5f9e4548","after_hash":"709298a25f8f81fa12a2c283c7a6ceb135a7bc4aead0a8db23a8dff4360be734","before_excerpt":"* **[Automatic caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#automatic-caching)**: Add a single `cache_control` field at the top level of your request. The system automatically applies the cache breakpoint to the last cacheable block and moves it forward as conversations grow. Best for multi-turn conversations where the growing message history should be cached automatically. * **[Explicit cache breakpoints](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#explicit-cache-breakpoints)**: Place `cache_control` directly on individual content blocks for fine-grained control over exactly what gets cached. 3. Otherwise, it processes the full prompt and caches the prefix once the response begins. * 5-minute cache write tokens are 1.25 times the …","after_excerpt":"* **[Automatic caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#automatic-caching):** Add a single `cache_control` field at the top level of your request. The system automatically applies the cache breakpoint to the last cacheable block and moves it forward as conversations grow. Best for multi-turn conversations where the growing message history should be cached automatically. * **[Explicit cache breakpoints](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#explicit-cache-breakpoints):** Place `cache_control` directly on individual content blocks for fine-grained control over exactly what gets cached. 3. Otherwise, it processes the full prompt and caches the prefix once the response starts. * Cache write tokens with a 5-minute TTL are …","status":"published","scope":"Published documentation; runtime behavior and legal interpretation not established.","before_capture":{"http_status":200,"resolved_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","etag":"","last_modified":"","response_date":"Wed, 21 Oct 2026 18:50:10 GMT","source_id":"anthropic-cache","source_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","captured_at":"2026-10-21T18:50:10Z","raw_sha256":"9e6f93274ddc0ef1a8915a420e68e1d89e9767c0b0f121402ca26cbc5f9e4548","normalized_sha256":"2550a288c4e6c97f4b7362abf8f318d1ff08672f4fe8feb728d658b207d166c5","collector_version":"1.0.0","normalizer_version":"1.1","locale":"en-US","collection_region":"existing hosting; account-independent public request","id":"snap-aadba0c39e22d9f851cb313ca4f8"},"after_capture":{"http_status":200,"resolved_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","etag":"","last_modified":"","response_date":"Wed, 21 Oct 2026 20:55:10 GMT","source_id":"anthropic-cache","source_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","captured_at":"2026-10-21T20:55:11Z","raw_sha256":"709298a25f8f81fa12a2c283c7a6ceb135a7bc4aead0a8db23a8dff4360be734","normalized_sha256":"822ce32bb736ab825fc23325d3d1db5175a1e69ccad98d3272d17f588dcea53f","collector_version":"1.0.0","normalizer_version":"1.1","locale":"en-US","collection_region":"existing hosting; account-independent public request","id":"snap-4e581f9a21039263e13dc9a18d1e"},"display_normalizer_version":"1.1","display_before_sha256":"2550a288c4e6c97f4b7362abf8f318d1ff08672f4fe8feb728d658b207d166c5","display_after_sha256":"822ce32bb736ab825fc23325d3d1db5175a1e69ccad98d3272d17f588dcea53f"},"content_scope":"Changed excerpts and retained capture metadata; complete raw responses archived privately"}