Claude Developer Platform Updates & Release Notes

• We've released the Usage & Cost API, allowing administrators to programmatically monitor their organization's usage and cost data.
• We've added a new endpoint to the Admin API for retrieving organization information. For details, see the Organization Info Admin API reference.

• We've launched beta support for a 1M token context window in Claude Sonnet 4 on the Claude API and Amazon Bedrock.

• Some customers might encounter 429 (rate_limit_error) errors following a sharp increase in API usage due to acceleration limits on the API. Previously, 529 (overloaded_error) errors would occur in similar scenarios.

• Search result content blocks are out of beta on the Claude API and Vertex AI. This feature enables natural citations for RAG applications with proper source attribution. The beta header search-results-2025-06-09 is no longer required. Learn more in Search results.

• We've launched Claude Opus 4.1, an incremental update to Claude Opus 4 with enhanced capabilities and performance improvements.* Learn more in Models overview.

*Opus 4.1 does not allow both temperature and top_p parameters to be specified. Please use only one.

• We've released text_editor_20250728, an updated text editor tool that fixes some issues from the previous versions and adds an optional max_characters parameter that allows you to control the truncation length when viewing large files.

• We've increased rate limits for Claude Opus 4 on the Claude API to give you more capacity to build and scale with Claude. For customers with usage tier 1-4 rate limits, these changes apply immediately to your account - no action needed.

• We've retired the Claude 2.0, Claude 2.1, and Claude Sonnet 3 models. All requests to these models will now return an error. Read more in Model deprecations.

• We've increased rate limits for Claude Sonnet 4 on the Claude API to give you more capacity to build and scale with Claude. For customers with usage tier 1-4 rate limits, these changes apply immediately to your account - no action needed.

• We've launched search result content blocks in beta, enabling natural citations for RAG applications. Tools can now return search results with proper source attribution, and Claude will automatically cite these sources in its responses - matching the citation quality of web search. This eliminates the need for document workarounds in custom knowledge base applications. Learn more in Search results. To enable this feature, use the beta header search-results-2025-06-09.

• Console users with the Developer role can now access the Cost page. Previously, the Developer role allowed access to the Usage page, but not the Cost page.

• We've launched fine-grained tool streaming in public beta, a feature that enables Claude to stream tool use parameters without buffering / JSON validation. To enable fine-grained tool streaming, use the beta header fine-grained-tool-streaming-2025-05-14.

• Our Ruby SDK has moved from beta to its first stable release.

• We've launched a web search tool in the API, allowing Claude to access up-to-date information from the web. Learn more in Web search tool.

• Cache control must now be specified directly in the parent content block of tool_result and document.source. For backwards compatibility, if cache control is detected on the last block in tool_result.content or document.source.content, it will be automatically applied to the parent block instead. Cache control on any other blocks within tool_result.content and document.source.content will result in a validation error.

• We launched a beta version of the Ruby SDK.

• Our Java SDK has moved from beta to its first stable release.
• We've moved our Go SDK from alpha to beta.