Claude Code v0.2.101

Model Selection and Configuration

• Added model selection support: Users can now choose between different Claude models or use the default
• Claude 3.7 Sonnet (Fast and balanced · $3/$15 per Mtok)
• Claude 3.5 Sonnet (Previous generation · $3/$15 per Mtok)
• Claude 3.5 Haiku (Quick responses · $0.80/$4 per Mtok)
• Custom model configurations
• Environment variable support: Set your preferred model using ANTHROPIC_MODEL environment variable
• Platform-specific model routing: Automatic detection and routing for Bedrock (CLAUDE_CODE_USE_BEDROCK) and Vertex (CLAUDE_CODE_USE_VERTEX) platforms

Migration System

• New migration framework: Automated migration system for handling configuration and data migrations between versions
• Bundled migration support: Special handling for Bun runtime with embedded migration files
• Version tracking: Migration files are now included with version metadata (v0.2.101)

IDE Integration Improvements

• IDE lock file management: New functions for managing IDE integration lock files in ~/.claude/ide/
• Connection handling: Enhanced TCP connection support for IDE integrations using Node.js net module

User Interface Enhancements

• Relative time formatting: New utility for displaying human-readable relative timestamps (e.g., "2 hours ago", "in 3 days")
• Enhanced permission context: Improved tool permission handling system

Performance and Stability

• React 18+ compatibility: Removed legacy React components and updated to modern React 18+ APIs
• Reduced bundle size: Removed approximately 496 deprecated functions while adding only 119 new ones
• Memory optimization: Cleaned up unused signal handling and event management code

Code Quality

• Structural similarity: Maintained 92.7% structural similarity with previous version for stability
• Modernized codebase: Removed legacy polyfills and outdated compatibility layers

• Fixed potential issues with Fast Refresh module reloading
• Improved cache invalidation for selectors returning inconsistent values
• Enhanced error handling for migration processes

• Better error messages: More descriptive error messages for migration failures
• Issue reporting: Direct links to GitHub issues (https://github.com/anthropics/claude-code/issues)
• Documentation: Updated references to documentation at https://docs.anthropic.com/s/claude-code

• Removed legacy signal handling utilities ($i0, Ui0)
• Removed deprecated React lifecycle methods and compatibility layers
• Some internal APIs have been restructured (maintaining 92.7% compatibility)

Setting a preferred model:

# Via environment variable
export ANTHROPIC_MODEL="claude-3-7-sonnet"
claude "Help me write a Python script"

# The CLI will use Claude 3.7 Sonnet for this request

Using platform-specific routing:

# For AWS Bedrock
export CLAUDE_CODE_USE_BEDROCK=true
claude "Analyze this codebase"

# For Google Cloud Vertex
export CLAUDE_CODE_USE_VERTEX=true
claude "Review this pull request"

The model selection interface provides clear pricing information and performance characteristics to help users choose the most appropriate model for their needs.