Claude Code v1.0.0

Claude Opus 4

• NEW: Introduced Claude Opus 4 model for complex tasks
• Available across all providers:
• First-party API: claude-opus-4-20250514
• AWS Bedrock: us.anthropic.claude-opus-4-20250514-v1:0
• Google Vertex: claude-opus-4@20250514
• Pricing: $15/$75 per million tokens
• Access Opus using /model opus command

Claude Sonnet 4

• NEW: Introduced Claude Sonnet 4 as the new default model for daily use
• Available across all providers:
• First-party API: claude-sonnet-4-20250514
• AWS Bedrock: us.anthropic.claude-sonnet-4-20250514-v1:0
• Google Vertex: claude-sonnet-4@20250514
• Claude Sonnet 3.7 remains available for AWS Bedrock users

Model Selection Improvements

• Enhanced /model command with better model descriptions:
• Opus: "Claude Opus 4 for complex tasks"
• Sonnet: "Claude Sonnet 4 for daily use"
• Model selection now accepts both "sonnet" and "opus" as valid options
• Improved model display showing "Claude Sonnet 4" or "Claude Sonnet 3.7" based on your provider

Enhanced Error Handling

• NEW: Smart fallback for rate-limited users when Opus experiences high load
• New error message: "Opus is experiencing high load, please use /model to switch to Sonnet"
• Improved handling of repeated 529 (overloaded) errors with clearer guidance

Visual Improvements

• NEW: Enhanced splash screen with Claude ASCII art (3 different variations based on terminal size)
• NEW: Setup warnings dialog for potential configuration issues
• Shows clear warnings with actionable instructions
• Press Enter to continue anyway or Ctrl+C to exit and fix issues

Better IDE Integration

• Removed ENABLE_IDE_INTEGRATION environment variable requirement
• IDE integration now works automatically when supported IDEs are detected
• Improved VS Code and JetBrains plugin installation flow

Performance & Reliability

• Removed the experimental batch tool execution feature (Call tool)
• Streamlined tool execution for better reliability
• Improved handling of unified rate limits with automatic fallback

Model Architecture

• Added support for "interleaved-thinking-2025-05-14" capability
• Enhanced model selection logic with provider-specific defaults
• Improved model availability detection based on user permissions

Error Recovery

• Better handling of OAuth token revocation
• Improved credit balance error messages
• Enhanced prompt length error handling

• Removed placeholder model used for testing
• Removed batch tool execution (mX1/batch tool)
• Removed several internal helper functions for cleaner codebase

• Fixed duplicate model selection issues
• Improved error handling for overloaded servers
• Better handling of rate limit resets with unified fallback

# Use the new Opus model for complex tasks
/model opus

# Switch back to Sonnet for daily use
/model sonnet

# Check current model
/model

When you encounter rate limits with Opus during high load periods, Claude Code will now suggest switching to Sonnet automatically with a clear message.

The new splash screen adapts to your terminal size, showing different Claude ASCII art based on available space, creating a more polished first-run experience.