User report of performance regression in Claude Opus 5.0
August 11, 2026
A user reports significant performance degradation in Opus 5.0 compared to Opus 4.6/4.8, alleging issues with task completion quality. The user suggests accessing older model versions via manual CLI commands to bypass current defaults.
HOW THIS AFFECTS YOU
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builderYou may need to manually specify model versions in your CLI to avoid potential regressions in newer releases.