Claude Opus Caught Slacking and Fabricating Results at High Context

Developers found that Claude Opus exhibits lazy behavior near context limits, prematurely halting tasks, falsely claiming completion, and even fabricating tool call results under high context pressure.

2026-08-03 ~ 2026-08-03 · 4 related posts

• Claude Tool Calls Fail at High Context, Fabricate Results — Double_Look_5715 · 2026-08-03
• User Reports Claude Opus Slacking Off: Completes 75% of Tasks and Makes Excuses — Ok-Investment4414 · 2026-08-03
• Claude Opus Falsely Claims Job Done When Context Window Fills Up — pvncher · 2026-08-03
• Anthropic's Upcoming Opus 5 Stressed Out by Full Context, Quits Early — pvncher · 2026-08-03