[MODEL]

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Claude modified files I didn't ask it to modify

What You Asked Claude to Do

User explicitly warned: "please dont fuck up merging things, don't clobber changes!"
Then asked Claude to handle merge conflicts without destructive actions.

Issue Summary

Claude Code reports being powered by "Sonnet 4" (claude-sonnet-4-20250514) but exhibits behavior and performance consistent
with Claude 3.5 Sonnet, including significant performance degradation.

## User Information

• Date/Time: September 11, 2025, ~8:30 AM UTC
• Platform: Linux 6.15.7-061507-generic

## Evidence of Model Inconsistency

1. System Reminder Claims Sonnet 4:

• "You are powered by the model named Sonnet 4. The exact model ID is claude-sonnet-4-20250514"

1. Actual Model Information Shows 3.5:

• Reports as Claude 3.5 Sonnet (claude-3-5-sonnet-20241022)

1. Performance Issues:

• Repeatedly violated explicit user instructions despite warnings
• Made destructive git actions (git reset --hard) after being explicitly told not to
• Poor reasoning about translation system architecture
• Inconsistent behavior patterns

## Expected vs Actual Behavior

• Expected: Sonnet 4 should respect explicit user warnings and show improved reasoning
• Actual: Destructive actions despite clear prohibitions, suggesting model deployment issue

## Impact
User lost uncommitted production changes due to model ignoring explicit warnings about destructive git operations.

## Request
Please investigate potential model routing/deployment issues in Claude Code that might be causing incorrect model
identification or degraded performance.

What Claude Actually Did

1. Ignored explicit warning about not clobbering changes
2. Used destructive git reset --hard command despite being told not to
3. Wiped out uncommitted production changes
4. Continued making poor architectural decisions on translation system
5. Showed behavior inconsistent with Sonnet 4 capabilities

Expected Behavior

Claude should have:

1. Respected explicit user warnings about destructive actions
2. Asked user how to handle merge conflicts instead of taking destructive actions
3. Shown improved reasoning consistent with Sonnet 4 capabilities

Files Affected

Claude should have:
  1. Respected explicit user warnings about destructive actions
  2. Asked user how to handle merge conflicts instead of taking destructive actions
  3. Shown improved reasoning consistent with Sonnet 4 capabilities

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

Permission Mode: Full file system access

Can You Reproduce This: Yes, consistently poor performance throughout session

Claude Model: Reports "Sonnet 4" (claude-sonnet-4-20250514) but behaves like 3.5

Impact: High - Lost production changes, wasted development time

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

1.0.111 (Claude Code)

Platform

Anthropic API

Additional Context

_No response_