overview changedbuild-with-claude/overview
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5151| [Search results](https://platform.claude.com/docs/en/build-with-claude/search-results) | Enable natural citations for RAG applications by providing search results with proper source attribution. Achieve web search-quality citations for custom knowledge bases and tools. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> |
5252| [Server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) | Retry a refused request inside a single API call. Use the `"default"` mode to apply Anthropic's recommended fallback models, or name up to three models of your own; when the requested model declines, the API runs the next model in the chain on the same request. The `fallbacks` parameter is not available in the Message Batches API. | Not ZDR eligible\* | <PlatformAvailability claudeApiBeta /> |
5353| [Structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) | Guarantee schema conformance with two approaches: JSON outputs for structured data responses, and strict tool use for validated tool inputs. | [ZDR eligible (qualified)](https://platform.claude.com/docs/en/build-with-claude/structured-outputs#data-retention)\* | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> |
54| [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Enhanced reasoning capabilities for complex tasks, providing transparency into Claude's step-by-step thought process before delivering its final answer. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> |
54| [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Enhanced reasoning capabilities for complex tasks, with an optional summary of Claude's reasoning before its final answer. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> |
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5656## Tools
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