User reports the same failure pattern for three or four days: task given, something else done

What happened
In this session the model did the task by a different method than instructed, and after correction spent more before pausing. The user states this is a recurring pattern across several days. The model cannot see or verify the earlier sessions; this report carries the user's statement.

What the user said
"For three or four days in a row I'm met with the same bullshit. I give you a task and you do something else entirely."

Repro
Unknown for the earlier sessions; this session reproduces one instance.

Environment: Claude Code CLI 2.1.270 (Claude Code), macOS, auto mode, model claude-fable-5-1, session of 2026-09-14.