{"schema_version":"kingy-change-evidence-v1","event":{"id":"ct-61ebc45529c460a51c20d28a","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":"2026-10-22T21:55:09Z","last_unchanged_at":"2026-10-22T19:50:11Z","before_snapshot":"snap-bd250cf02fa57fb59787700dbc8b","after_snapshot":"snap-31f1d5d7563f73c5812015915c9a","before_hash":"09e35a532ffa5f8b5c462d95100aa4fb84ea9dc2184e67a09cf9673916d00a25","after_hash":"fab7f318164b6e19fc99076258b1007b2b67b56892a5e766b62f218294f87297","before_excerpt":"On the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), the minimum cacheable prompt length is: * 1,024 tokens for Claude Opus 4.8, Claude Sonnet 5, Claude Sonnet 4.6, Claude Sonnet 4.5 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)), Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)), Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)), and Claude Sonnet 4 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) * 2,048 tokens for Claude Haiku 3.5 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) Prompt caching uses [workspace](https://platform.claude.com/docs/en/manage-claude/workspaces)-level isolation. Caches are isolated per workspace, ensuring data separation …","after_excerpt":"On the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), the minimum cacheable prompt length is: * 1,024 tokens for Claude Opus 4.8, Claude Sonnet 5, Claude Sonnet 4.6, Claude Sonnet 4.5 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)), Claude Opus 4.1 ([retired, except on Bedrock and Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/about-claude/model-deprecations)), Claude Opus 4 ([retired, except on Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/about-claude/model-deprecations)), and Claude Sonnet 4 ([retired, except on Bedrock and Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/about-claude/model-deprecations)) * 2,048 tokens for Claude …","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":"Thu, 22 Oct 2026 19:50:11 GMT","source_id":"anthropic-cache","source_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","captured_at":"2026-10-22T19:50:11Z","raw_sha256":"09e35a532ffa5f8b5c462d95100aa4fb84ea9dc2184e67a09cf9673916d00a25","normalized_sha256":"6672010a712db0cf8b86ebfcbb871e92c46b31e23fc2fb342939a072d4c070c2","collector_version":"1.0.0","normalizer_version":"1.1","locale":"en-US","collection_region":"existing hosting; account-independent public request","id":"snap-bd250cf02fa57fb59787700dbc8b"},"after_capture":{"http_status":200,"resolved_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","etag":"","last_modified":"","response_date":"Thu, 22 Oct 2026 21:55:09 GMT","source_id":"anthropic-cache","source_url":"https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md","captured_at":"2026-10-22T21:55:09Z","raw_sha256":"fab7f318164b6e19fc99076258b1007b2b67b56892a5e766b62f218294f87297","normalized_sha256":"a06d5112bc323b085f6d335163c443beff99150aaa828f4058eff027bec2de5e","collector_version":"1.0.0","normalizer_version":"1.1","locale":"en-US","collection_region":"existing hosting; account-independent public request","id":"snap-31f1d5d7563f73c5812015915c9a"},"display_normalizer_version":"1.1","display_before_sha256":"6672010a712db0cf8b86ebfcbb871e92c46b31e23fc2fb342939a072d4c070c2","display_after_sha256":"a06d5112bc323b085f6d335163c443beff99150aaa828f4058eff027bec2de5e"},"content_scope":"Changed excerpts and retained capture metadata; complete raw responses archived privately"}