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[Release] anthropics/claude-code v2.1.219: v2.1.219
Claude Code v2.1.219 introduces Claude Opus 5 as the new default model with 1M context window and improved pricing, adds network security controls via strict allowlist settings, and enhances subagent nesting capabilities up to depth 3. The release includes fixes for permission handling in self-hosted runners, improved MCP server error reporting, and UI improvements across model selection, workflow sizing, and accessibility features.
- Claude Opus 5 is now the default Opus model with 1M context window at $10/$50 per Mtok, replacing Opus 4.7 in fast mode
- New `sandbox.network.strictAllowlist` setting enables denying non-allowlisted hosts for sandboxed commands without user prompts
- Added `DirectoryAdded` hook that fires when new working directories are registered mid-session via `/add-dir` or SDK `register_repo_root`
- +7 more key points...
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MCP Servers
[Release] langchain-ai/langchain langchain-anthropic==1.5.1: langchain-anthropic==1.5.1
langchain-anthropic version 1.5.1 has been released with three key improvements. The update adds support for LangSmith gateway configuration through environment variables, enabling structured output for Claude Opus 4.8 model, and includes general release updates. This version enhances integration capabilities and model compatibility for Anthropic-based LangChain applications.
github-actions[bot]
[Release] langchain-ai/langchain langchain-fireworks==1.5.1: langchain-fireworks==1.5.1
langchain-fireworks version 1.5.1 has been released with a key feature addition enabling LangSmith gateway support through environment variables. This update improves integration capabilities across Anthropic, Fireworks, and OpenAI providers by allowing users to configure gateway access via environment configuration rather than code changes. The release builds on version 1.5.0 with enhanced flexibility for enterprise deployments and monitoring workflows.
github-actions[bot]
Integrations
[Release] langchain-ai/langchain langchain-openai==1.4.1: langchain-openai==1.4.1
langchain-openai version 1.4.1 has been released with three key updates: support for LangSmith gateway configuration through environment variables across Anthropic, Fireworks, and OpenAI integrations, and a correction to the gpt-5.3-chat-latest profile. This release enables better integration with LangSmith monitoring and fixes a profile naming issue in the OpenAI provider.
github-actions[bot]
[Release] langchain-ai/langchain langchain-core==1.5.1: langchain-core==1.5.1
langchain-core version 1.5.1 is released with three key improvements: support for LangSmith gateway configuration via environment variables across Anthropic, Fireworks, and OpenAI integrations, and a fix for BaseTool token counting that leverages tool_call_schema caching in the count_tokens_approximately method. This patch release enhances gateway flexibility and optimizes token counting performance.
github-actions[bot]
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