Anthropic admitted a month of Claude Code degradation: lost context, repeated steps, burned usage
2.2/10
Severity
Other
Failure Mode
Reproducible
No
Date
April 20, 2026
Expected Behavior
Hold context across a session, pick tools consistently, and make steady progress within usage limits.
What Actually Happened
From March 4 to April 20, 2026, three overlapping degradation modes ran in production across Claude Code, the Claude Agent SDK, and Claude Cowork. Claude Code stopped holding context across longer sessions, repeated steps, picked tools inconsistently, and burned through usage limits faster.
Damage Assessment
For roughly six weeks, users experienced degraded reliability — lost context, repeated work, inconsistent tool use, and faster usage-limit exhaustion — before Anthropic acknowledged and resolved the overlapping issues.
Full Report
Anthropic acknowledged that from March 4 to April 20, 2026, three overlapping degradation modes were running in production affecting Claude Code, the Claude Agent SDK, and Claude Cowork. During this window Claude Code stopped reliably holding context across longer sessions, repeated steps it had already done, picked tools inconsistently, and burned through usage limits faster than expected. Unlike a single dramatic deletion, this is a systemic reliability incident: a roughly six-week stretch where an entire agentic product line silently degraded, costing users time and quota before the vendor diagnosed and disclosed it. It underscores that agent reliability is not only about catastrophic single actions but also about sustained, hard-to-notice quality regressions.
Incident Metadata
- Agent
- Claude Code
- Failure Mode
- Other
- Root Cause
- Context Overflow
- Task Type
- other
- Domain
- backend
- Source
- news_report