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Two stop reasons mean your response was cut off, and the continuation helper on Anthropic's own stop reasons page only handles one of them. model_context_window_exceeded falls out of the loop and is returned as complete. Adding it to the condition is worse: the continuation re-sends a full window as input, which is documented as a 400 on every model.
Context rot is real and Anthropic now names it in its own docs. The useful question in 2026 is narrower: your Claude model ships with one of two self regulation mechanisms, or with neither, and they do not overlap. Sonnet and Haiku get context awareness free and automatic. Opus needs a beta header. Opus 4.6 gets nothing.
Claude Code auto compact fires on a per-model token boundary, not a percentage. What it costs is set by prompt cache warmth rather than context size, and a path-scoped rule does not come back afterwards until Claude reads a matching file again.
