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citations Claude Developer Platform · in the page build-with-claude/citations …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: eligibility… claude-in-amazon-bedrock Claude Developer Platform · in the page build-with-claude/claude-in-amazon-bedrock …l 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 (recommended… claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …ld-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 indepe… anthropic-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/anthropic-managed …cs/en/cli-sdks-libraries/cli/quickstart) pick them up: ```bash CLI export ANTHROPIC_GOOGLE_CLOUD_PROJECT="my-project-id" export ANTHROPIC_GOOGLE_CLOUD_WORKSPACE_ID="wrkspc_01AbCdEf23GhIj" ``` ### In… google-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/google-managed …](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) support Claude Models on Google Cloud (Google managed) through `AnthropicVertex` (csharp: `AnthropicVertexClient`; go: `vertex.WithGo… overview Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/overview …](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) support both offerings. ## Moving between the two offerings Follow the steps for whichever offering you're moving to: * [Steps for… claude-on-amazon-bedrock-legacy Claude Developer Platform · in the page build-with-claude/claude-on-amazon-bedrock-legacy …ck. 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 the… claude-platform-on-aws Claude Developer Platform · in the page build-with-claude/claude-platform-on-aws …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 infrastructure… sent_count = len(messages sent in the compaction request) Claude Developer Platform · in the page build-with-claude/compaction …-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-opus… compaction-background Claude Developer Platform · in the page build-with-claude/compaction-background …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-previe… compaction-keep-recent-turns Claude Developer Platform · in the page build-with-claude/compaction-keep-recent-turns …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-previe… compaction-on-demand Claude Developer Platform · in the page build-with-claude/compaction-on-demand …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-previe… compaction-thinking-blocks Claude Developer Platform · in the page build-with-claude/compaction-thinking-blocks …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-previe… compaction-threshold Claude Developer Platform · in the page build-with-claude/compaction-threshold …-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-previe… 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 yo… context-windows Claude Developer Platform · in the page build-with-claude/context-windows …own as *context rot*. This makes curating what's in context just as important as how much space is available. <Tip> For more on why long contexts degrade and how to engineer around it, see [Effecti… effort Claude Developer Platform · in the page build-with-claude/effort …-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-previe… This will automatically use the environment variable VOYAGE_API_KEY. Claude Developer Platform · in the page build-with-claude/embeddings …bedding lookup speed and end-to-end latency. This is a particularly important consideration for large-scale production deployments. * Customization: options for continued training on private data, or… extended-thinking Claude Developer Platform · in the page build-with-claude/extended-thinking …d 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 [API… fallback-credit Claude Developer Platform · in the page build-with-claude/fallback-credit …e in the retry's `usage`. Compared with what the same request would report without the token, `cache_creation_input_tokens` is lower, and `cache_read_input_tokens` is higher by the same amount. A shif… fast-mode Claude Developer Platform · in the page build-with-claude/fast-mode …e 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.claud… files Claude Developer Platform · in the page build-with-claude/files …xecution tool. featureMetadata: status: ga zdr: not-eligible supportedPlatforms: Claude API: ga Claude Platform on AWS: ga Microsoft Foundry: availability: ga note: On [M… handling-stop-reasons Claude Developer Platform · in the page build-with-claude/handling-stop-reasons …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` obje… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …id-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-me… mid-conversation-system-messages Claude Developer Platform · in the page build-with-claude/mid-conversation-system-messages …hich 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 `defer… overview Claude Developer Platform · in the page build-with-claude/overview …latform 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/doc… preserved-thinking Claude Developer Platform · in the page build-with-claude/preserved-thinking …tted`. Models that don't run the prefix check accept the object and report only model-check drops, so one request body works across models. The API reference calls the prefix check the conversation ch… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …} fmt.Println(response.Usage.RawJSON()) ``` ```java Java import com.anthropic.models.messages.CacheControlEphemeral; // ... public class PromptCachingExample { public static void… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …our instructions, such as explaining to Claude why such behavior is important, can give Claude more information about your goals and help it deliver more targeted responses. <Accordion title="Example… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …ot correctness on complex, well-specified problems.** Early testers reported single-pass implementations of systems that previously took days of iteration. * **Vision.** Claude Fable 5 interprets dens… Delivering work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-1 …nudge follows it. <CodeGroup exclude="shell"> ```python Python import anthropic from anthropic.types.beta import ( BetaMessageParam, BetaToolParam, BetaToolResultBlockParam,… prompting-claude-haiku-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-haiku-5-5 …-5#prevent-early-stopping-in-long-agent-prompts) * Code changes are reported as done without a check that exercises them: [Tell coding agents to verify their changes](https://platform.claude.com/docs/… prompting-claude-opus-4-8 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-4-8 …ugh the problem before responding. ``` Effort is likely to be more important for this model than for any prior Opus, so experiment with it actively when you upgrade. On Claude Opus 4.8, thinking is… prompting-claude-opus-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5 …an 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" or… prompting-claude-opus-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5-5 …bled) * An unattended agent stops partway through a long task after reporting progress: [Unattended agentic runs](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-cla… prompting-claude-sonnet-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5 …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 thinkin… prompting-claude-sonnet-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5 …net-5-5#mid-turn-user-messages-and-task-budgets) * Code changes are reported as done without a test or build run: [Verification on coding tasks](https://platform.claude.com/docs/en/build-with-claude/p… refusals-and-fallback Claude Developer Platform · in the page build-with-claude/refusals-and-fallback …try 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.com/… search-results Claude Developer Platform · in the page build-with-claude/search-results …ctive 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 of t… skills-guide Claude Developer Platform · in the page build-with-claude/skills-guide …log.Fatal(err) } fmt.Println(response) ``` ```java Java import com.anthropic.models.messages.ContainerParams; import com.anthropic.models.messages.SkillParams; import com.anthropic.mod… streaming Claude Developer Platform · in the page build-with-claude/streaming …locks 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 ca… structured-outputs Claude Developer Platform · in the page build-with-claude/structured-outputs …-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-previe… task-budgets Claude Developer Platform · in the page build-with-claude/task-budgets …reMetadata: 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 …t.Printf("\nResponse: %s", v.Text) } } ``` ```java Java import com.anthropic.models.messages.ThinkingConfigAdaptive; void main() { AnthropicClient client = AnthropicOkHttpClient.f… thinking-steering-and-cost Claude Developer Platform · in the page build-with-claude/thinking-steering-and-cost …s) 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 conversatio… thinking-tool-workflows Claude Developer Platform · in the page build-with-claude/thinking-tool-workflows …tended 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 400 e… thinking-troubleshooting Claude Developer Platform · in the page build-with-claude/thinking-troubleshooting …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 ma… token-counting Claude Developer Platform · in the page build-with-claude/token-counting …-and-data-retention#model-specific-data-retention-requirements). supportedPlatforms: Claude API: ga Claude Platform on AWS: ga Amazon Bedrock: ga Claude Models on Google Cloud (Googl… vision Claude Developer Platform · in the page build-with-claude/vision …, ) print(message.content) ``` ```typescript TypeScript import Anthropic, { toFile } from "@anthropic-ai/sdk"; import fs from "node:fs"; const anthropic = new Anthropic(); // Uploa… vision-coordinates Claude Developer Platform · in the page build-with-claude/vision-coordinates …here 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). <Not…