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.