980 pages for support.

Message Batches API Claude Developer Platform · in the page build-with-claude/batch-processing …cs/en/build-with-claude/prompt-caching#pre-warming-the-cache)) is not supported inside a batch, because an ephemeral cache entry written during batch processing would likely expire before the follow-u… cache-diagnostics Claude Developer Platform · in the page build-with-claude/cache-diagnostics …api-and-data-retention#model-specific-data-retention-requirements). supportedPlatforms: Claude API: ga --- [Prompt caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching)… citations Claude Developer Platform · in the page build-with-claude/citations …es in your source documents. Citations return the exact passages that support each claim, so you can verify answers and surface sources to your users. featureMetadata: status: ga zdr: eligibil… claude-in-amazon-bedrock Claude Developer Platform · in the page build-with-claude/claude-in-amazon-bedrock …mail once it's complete. ## Authentication Claude in Amazon Bedrock supports three authentication paths. Choose the one that best fits your security requirements. ### Bedrock service role (recommen… claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) | Claude Sonnet 5.5 supports only Global Standard deployments. <Note> Anthropic acts as an ind… claude-on-amazon-bedrock-legacy Claude Developer Platform · in the page build-with-claude/claude-on-amazon-bedrock-legacy …drock. The ARN-versioned models in the model table on this page don't support `2026-10-21` on Bedrock, and requests to them that send it can return a 400 error. If you call them through the SDK, keep… claude-on-vertex-ai Claude Developer Platform · in the page build-with-claude/claude-on-vertex-ai …claude.com/docs/en/api/migration-2026-10-21). Agent Platform is also supported by Anthropic's official [client SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview). This guide walks… claude-platform-on-aws Claude Developer Platform · in the page build-with-claude/claude-platform-on-aws …ing integration through AWS Marketplace. <Note> The Anthropic SDKs support Claude Platform on AWS. </Note> ## How the platform integration works Claude models run on Anthropic-managed infrastruct… sent_count = len(messages sent in the compaction request) Claude Developer Platform · in the page build-with-claude/compaction …api-and-data-retention#model-specific-data-retention-requirements)) - Supported models: `claude-fable-5-1`, `claude-mythos-5-1`, `claude-fable-5`, `claude-mythos-5`, `claude-mythos-preview`, `claude-o… compaction-background Claude Developer Platform · in the page build-with-claude/compaction-background …s. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… compaction-keep-recent-turns Claude Developer Platform · in the page build-with-claude/compaction-keep-recent-turns …d. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… compaction-on-demand Claude Developer Platform · in the page build-with-claude/compaction-on-demand …y. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… compaction-thinking-blocks Claude Developer Platform · in the page build-with-claude/compaction-thinking-blocks …k. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… compaction-threshold Claude Developer Platform · in the page build-with-claude/compaction-threshold …api-and-data-retention#model-specific-data-retention-requirements). supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… context-editing Claude Developer Platform · in the page build-with-claude/context-editing …## Server-side strategies <Note> Context editing is in beta with support for tool result clearing and thinking block clearing. To enable it, use the beta header `context-management-2025-06-27` in… context-windows Claude Developer Platform · in the page build-with-claude/context-windows …block, the API returns an error. <Note> Most current Claude models support [interleaved thinking](https://platform.claude.com/docs/en/build-with-claude/thinking#interleaved-thinking), which lets Cl… effort Claude Developer Platform · in the page build-with-claude/effort …api-and-data-retention#model-specific-data-retention-requirements). supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… This will automatically use the environment variable VOYAGE_API_KEY. Claude Developer Platform · in the page build-with-claude/embeddings …commended replacement, see [Model deprecations, lifecycle states, and support](https://www.mongodb.com/docs/voyageai/models/lifecycle/) in the MongoDB documentation. | Model | Context le… extended-thinking Claude Developer Platform · in the page build-with-claude/extended-thinking …nded thinking with a fixed budget_tokens budget on Claude models that support it, and migrate to adaptive thinking. --- <Note> To learn how zero data retention (ZDR) applies to this feature, see [A… fallback-credit Claude Developer Platform · in the page build-with-claude/fallback-credit …loud, and Microsoft Foundry, where it can still be absent while their support for the field rolls out. In that case, treat the retry shape as unknown rather than as `false` (python: `False`). Try the… fast-mode Claude Developer Platform · in the page build-with-claude/fast-mode …mode description: Get up to 2.5x higher output tokens per second from supported Claude models. featureMetadata: zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.cl… files Claude Developer Platform · in the page build-with-claude/files …e execution tool. featureMetadata: status: ga zdr: not-eligible supportedPlatforms: Claude API: ga Claude Platform on AWS: ga Microsoft Foundry: availability: ga note: On… handling-stop-reasons Claude Developer Platform · in the page build-with-claude/handling-stop-reasons …rn more about [understanding Sonnet 4.5's API safety filters](https://support.claude.com/en/articles/12449294-understanding-sonnet-4-5-s-api-safety-filters). </Tip> On a refusal, the `stop_details` o… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …s mid-conversation system messages; for the models and platforms that support them, see [Mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system… mid-conversation-system-messages Claude Developer Platform · in the page build-with-claude/mid-conversation-system-messages …, which the `mid-conversation-tool-changes-2026-07-01` header doesn't support. Every tool declared in `tools` is offered to the model from the start of the conversation unless it is declared with `de… overview Claude Developer Platform · in the page build-with-claude/overview …A platform listed without a label offers the feature as stable, fully supported, and recommended for production use, with no beta header and with standard API [versioning](https://platform.claude.com/… preserved-thinking Claude Developer Platform · in the page build-with-claude/preserved-thinking …el effort does restart the prompt cache. Where the model and platform support [per-message effort](https://platform.claude.com/docs/en/build-with-claude/effort#change-effort-mid-conversation-beta), us… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …ture. The following table shows the price per million tokens for each supported model: | Model… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …for Claude to continue from) on the last assistant turn are no longer supported. Requests with prefilled assistant messages to these models return a 400 error. Model intelligence and instruction follo… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …he thing the user would ask for if they said "just give me the TLDR." Supporting detail and reasoning come after. Being readable and being concise are different things, and readability matters more.… Delivering work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-1 …restarts, deletes, or config edits), check that the evidence actually supports that specific action. A signal that pattern-matches to a known failure may have a different cause. ``` The opening sente… prompting-claude-haiku-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-haiku-5-5 …their system prompt When you deploy Claude Haiku 5.5 as a chatbot or support assistant, add this text to your system prompt, alongside your other [prompt injection protections](https://platform.claud… prompting-claude-opus-4-8 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-4-8 …and less compressed. Headline text can be large and uppercase, while supporting copy remains short and sparse. The sub texts should be written with Alumni Sans SC in 4-6px like tiny little texts on c… prompting-claude-opus-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5 …than false positives. Accuracy holds at lower effort settings, which supports a fast pass at review time and a more thorough pass later. If your review prompt says "only report high-severity issues"… prompting-claude-opus-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5-5 …mate security work, apply to the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). * **Reasoning extraction:** Requests that push the model to reproduce its internal reaso… prompting-claude-sonnet-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5 …ded thinking (`thinking: {type: "enabled", budget_tokens: N}`) is not supported on Claude Sonnet 5 and returns a 400 error. It was deprecated on Claude Sonnet 4.6 and is now removed. Use adaptive thin… prompting-claude-sonnet-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5 …when coding.** The model tends to add tests, documentation, and small supporting files that fit your repository's conventions, even when you don't ask for them. It does this at every effort level, and… refusals-and-fallback Claude Developer Platform · in the page build-with-claude/refusals-and-fallback …retry the request. If a reworded request is still declined, [contact support](https://support.claude.com/en/articles/9015913-how-to-get-support) and include the [request ID](https://platform.claude.c… search-results Claude Developer Platform · in the page build-with-claude/search-results …[active models](https://platform.claude.com/docs/en/models/overview) support search results with citations, with the exception of Claude Haiku 3. No beta header is required: search results are part o… skills-guide Claude Developer Platform · in the page build-with-claude/skills-guide …he top level with `name` and `description` YAML frontmatter, plus any supporting scripts or resources. See [Get started with Agent Skills in the API](https://platform.claude.com/docs/en/agents-and-too… streaming Claude Developer Platform · in the page build-with-claude/streaming …t blocks correspond to updates for the `input` field of the block. To support maximum granularity, the deltas are *partial JSON strings*, whereas the final `tool_use.input` is always an *object*. You… structured-outputs Claude Developer Platform · in the page build-with-claude/structured-outputs …api-and-data-retention#model-specific-data-retention-requirements). supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-mythos-pre… task-budgets Claude Developer Platform · in the page build-with-claude/task-budgets …atureMetadata: status: beta betaHeader: task-budgets-2026-03-13 supportedModels: - claude-fable-5-1 - claude-mythos-5-1 - claude-fable-5 - claude-mythos-5 - claude-opus-5-5… thinking Claude Developer Platform · in the page build-with-claude/thinking …re you send a request, read its `capabilities.thinking.types.disabled.supported` or `capabilities.thinking.types.between_tools.supported` value from the Models API. [Using the Models API](https://plat… thinking-steering-and-cost Claude Developer Platform · in the page build-with-claude/thinking-steering-and-cost …vels) on the effort page is the authority for which levels each model supports. ### System prompt guidance System prompt guidance shifts Claude's thinking threshold for every request in the conversa… thinking-tool-workflows Claude Developer Platform · in the page build-with-claude/thinking-tool-workflows …extended thinking (`thinking: {type: "enabled"}`). Adaptive thinking supports forced tool use, except on Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and Claude Mythos 5.1, which return a 40… thinking-troubleshooting Claude Developer Platform · in the page build-with-claude/thinking-troubleshooting …cks back in later requests). The first section maps each model to its supported thinking configurations and the ones it rejects; the sections after it each start from a symptom you observe, so you can… token-counting Claude Developer Platform · in the page build-with-claude/token-counting …api-and-data-retention#model-specific-data-retention-requirements). supportedPlatforms: Claude API: ga Claude Platform on AWS: ga Amazon Bedrock: ga Google Cloud: ga Microsoft Fo… vision Claude Developer Platform · in the page build-with-claude/vision …10 MB on [claude.ai](https://claude.ai/). <Note> Although the API supports up to 600 images per request, [request size limits](https://platform.claude.com/docs/en/api/overview#request-size-limits)… vision-coordinates Claude Developer Platform · in the page build-with-claude/vision-coordinates …k where you act on a specific region of an image. For sending images, supported formats, and per-model resolution limits, see [Vision](https://platform.claude.com/docs/en/build-with-claude/vision). <…