Claude Platform Updates: New Sonnet 5, API Key Expiration, Agent Memory
Anthropic has released Claude Sonnet 5 with a 1M token context window and updated pricing, introducing significant behavioral changes and a new tokenizer for Sonnet 5. The Claude Platform now supports API key expiration in the Console, enhancing security for administrators. Additionally, updates to agent memory handling and SDKs improve developer experience and tool integration across various models.
- →Launch of Claude Sonnet 5 with 1M token context
- →API Key Expiration Setting in Claude Console
- →Agent Memory API Updates and SDK Integration
- →Override agent configuration for Claude Managed Agents sessions
- →Claude Managed Agents session event streams support deltas
Features (4) ›
- Launch of Claude Sonnet 5 with 1M token context
Claude Sonnet 5 is now available with introductory pricing and a 1M token context window. It supports 128k max output tokens and includes behavioral changes like adaptive thinking enabled by default and removal of manual extended thinking. Sonnet 5 uses a new tokenizer that increases token count by approximately 30% for the same text.
- API Key Expiration Setting in Claude Console
Users can now set an expiration date when creating API keys or Admin API keys in the Claude Console. Options include preset durations, custom times, or never expiring. For keys with a lifetime of 7 days or more, the creator will receive an email notification before expiration.
- Agent Memory API Updates and SDK Integration
The agent-memory-2026-07-22beta header now provides stable ordering for listing memories, ignoring `order_by` and `order` parameters. The Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs have been updated to use this header for memory store calls, replacing the older managed-agents-2026-04-01 header.
- Override agent configuration for Claude Managed Agents sessions
When creating a Claude Managed Agents session, developers can now override the agent's configuration for that specific session. This allows for session-specific adjustments to the model, system prompt, tools, MCP servers, or skills without altering the agent itself.
Enhancements (2) ›
- Claude Managed Agents session event streams support deltas
Claude Managed Agents session event streams now support event deltas through the `event_deltas[]` query parameter. This feature allows developers to preview an agent message's text as it's generated, before the complete `agent.message` event is received.
- Claude Managed Agents session listing supports backward pagination
Listing sessions for Claude Managed Agents now includes backward pagination support. The `GET /v1/sessions` endpoint returns a `prev_page_cursor` alongside `next_page`, enabling navigation to previous pages of results.
https://platform.claude.com/docs/en/release-notes/overview