Invalid Version: 2.1.0 (2026-01-07) error on startup

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

After upgrading to version 2.1.0, Claude Code fails to start with a semver parsing error:

ERROR Invalid Version: 2.1.0 (2026-01-07)

file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:869:8900

• iT (file:///...cli.js:869:8900)
• SJ8 (file:///...cli.js:869:14028)
• Object.dJ8 (file:///...cli.js:869:14584)
• (file:///...cli.js:3091:4240)
• at Array.sort (<anonymous>)
• de2 (file:///...cli.js:3091:4224)

What Should Happen?

Claude should open

Error Messages/Logs

ERROR  Invalid Version: 2.1.0 (2026-01-07)                                                                                                                                                                            
                                                                                                                                                                                                                        
 file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:239:6514                                                                                                             
                                                                                                                                                                                                                        
 - KT (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:239:6514)                                                                                                      
 - _P8 (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:239:11642)                                                                                                    
 - Object.hP8 (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:239:12198)                                                                                             
 -  (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2661:4237)                                                                                                       
 -     at Array.sort (<anonymous>)                                                                                                                                                                                      
 - We2 (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2661:4221)                                                                                                    
 - ve2 (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2661:14825)                                                                                                   
 - i5 (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:252:20693)                                                                                                     
 - $Y (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:252:39057)                                                                                                     
 - Ht (file:///Users/admin/.nvm/versions/node/v22.21.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:252:49664)

Steps to Reproduce

Run claude v2.1.0

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.73

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_