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anthropic Claude Platform Release Notes ·

Claude Platform Updates Include New API Features and Model Enhancements

aipreview
feature patch deprecation announcement

Anthropic has released several updates to its Claude Platform, including new API capabilities for managing organizations and conversations, and enhancements to model features like context windows and memory management. These changes aim to improve developer control, user experience, and model performance for a wide range of users, from individual developers to enterprise organizations. Notable additions include mid-conversation system messages, an Admin API for user management, and a new Sonnet 5 model with expanded capabilities, some of which are currently in beta or preview.

  • →Mid-conversation system messages available for specific Claude models
  • →Claude Enterprise Admin API for organization management now in beta
  • →Dreams research preview now supports Claude Fable 5 and Sonnet 5
  • →Claude Sonnet 5 launched with 1M token context window and updated features
  • →API key expiration management added to Claude Console
Features (4) ›
  • Mid-conversation system messages available for specific Claude models

    Mid-conversation system messages are now supported on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8 via the Claude API, Amazon Bedrock, and Google Cloud. This feature is available without a beta header and corrects prior availability notes.

  • Claude Enterprise Admin API for organization management now in beta

    The Admin API for Claude Enterprise organizations is in beta, enabling management of members, roles, invites, groups, and custom roles. Specific beta headers are required for group and custom-role requests, while member and invite requests do not need them.

  • Dreams research preview now supports Claude Fable 5 and Sonnet 5

    The Dreams research preview has expanded its model support to include Claude Fable 5 and Claude Sonnet 5, offering users more options for this experimental feature.

  • Claude Sonnet 5 launched with 1M token context window and updated features

    Claude Sonnet 5 is now available with introductory pricing, featuring a 1M token context window and 128k max output tokens. Notable changes include adaptive thinking enabled by default, removal of manual extended thinking, and an updated tokenizer that increases token count by approximately 30% for the same text.

Enhancements (2) ›
  • API key expiration management added to Claude Console

    Users can now set an expiration date when creating API keys or Admin API keys in the Claude Console, with options for presets or custom durations. For keys with a lifetime of at least seven days, the creator will receive an email notification before expiration.

  • Agent memory list behavior updated with new beta header

    The agent-memory-2026-07-22beta header changes the behavior of listing memories, enforcing stable server-defined ordering and modifying parameter handling for depth and path prefix. This replaces the managed-agents-2026-04-01 header on memory store endpoints.

Read the original announcement →

https://platform.claude.com/docs/en/release-notes/overview

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