# Claude Code v0.2.101

> Claude Code v0.2.101, released 5 May 2025 (2025-05-05). 6 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/0.2.101

## Changes

### New Features

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

### Technical Improvements

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- **Modernized codebase**: Removed legacy polyfills and outdated compatibility layers

### Bug Fixes

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

### Developer Experience

- **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`

### Breaking Changes

- 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)

### Usage Examples

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.