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Claude Sonnet 4.6 users report worsening efficacy and chat history issues

Users are reporting that Anthropic's Claude Sonnet 4.6, particularly within its VS Code extension, may be experiencing a decline in efficacy. Initially, the model incorrectly stated that chat history was not persisted, but later corrected itself to acknowledge local storage within the `.claude/projects/` directory on Windows. This incident, coupled with other users' observations of increasingly incorrect answers over time, has led to speculation about a potential degradation in the model's performance. AI

IMPACT User experiences suggest potential issues with model consistency and memory, impacting its reliability for coding tasks.

RANK_REASON User reports and discussions about a model's perceived performance degradation.

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COVERAGE [1]

  1. r/ClaudeAI TIER_2 English(EN) · /u/Chagtk ·

    Is Claude Sonnet 4.6 efficacy worsening over time?

    <!-- SC_OFF --><div class="md"><p>For context, I had renamed a directory that claude code had access to, so I inquired about this to Sonnet. For the question:</p> <blockquote> <p>&quot;This used to be a very active claude project in vs code but now i cant find any of my old chats…