[MODEL] Opus appears be losing context early

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

A fresh Opus session is performing like it's lost context. Two sessions have behaved this way today.

What Claude Actually Did

1. Repeatedly made the same mistakes.

Expected Behavior

1. Not repeatedly make the same mistakes.

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

_No response_

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

1.0.89 (Claude Code)

Platform

Anthropic API

Additional Context

_No response_