Claude Platform Updates: New Models, Rate Limits, and SDK Enhancements
Anthropic has released Claude Sonnet 5 and Claude Fable 5, introducing new pricing and a 1M token context window. Rate limits have been standardized across models, and several older models are retired. The release also includes SDK updates, new tool capabilities, and enhancements to managed agents, affecting developers and architects working with the Claude API.
- →Launch of Claude Sonnet 5 and Claude Fable 5 models
- →Deprecation and retirement of older Claude Opus and Sonnet models
- →Research preview for MCP tunnels and new Management API
- →Standardized Claude API rate limits and tier consolidation
- →SDKs and tools updated for code execution and web search
Deprecations (1) ›
- Deprecation and retirement of older Claude Opus and Sonnet models
Claude Sonnet 4 and Claude Opus 4 models have been retired, with requests now returning an error. Fast mode for Claude Opus 4.7 is deprecated and will be removed on July 24, 2026. Claude Opus 4.1 is also deprecated.
Features (2) ›
- Launch of Claude Sonnet 5 and Claude Fable 5 models
Claude Sonnet 5 offers introductory pricing and a 1M token context window, while Claude Fable 5 and Claude Mythos 5 are also released with 1M token context windows. These new models include features like adaptive thinking by default and support for new tokenizers.
- Research preview for MCP tunnels and new Management API
The management API for MCP tunnels has moved from /v1/organizations/tunnels to /v1/tunnels on the Claude API, utilizing a new header and scope. The previous endpoint remains available during a migration window.
Enhancements (3) ›
- Standardized Claude API rate limits and tier consolidation
Rate limits for Claude Sonnet and Haiku now match Claude Opus. Usage tiers have been consolidated into 'Start', 'Build', and 'Scale', with most organizations moving to higher tiers without requiring action.
- SDKs and tools updated for code execution and web search
Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now support code_execution_20260120 for REPL state persistence. Web search and fetch tools are updated to version web_search_20260318 and web_fetch_20260318, respectively.
- Claude Managed Agents enhancements
Managed Agents now support scheduled deployments and environment variable credentials for secure secret injection. Webhook events now include a session_thread_id for multi-agent threads.
https://platform.claude.com/docs/en/release-notes/overview