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Anthropic Releases Prompt and Harness Adjustments for Claude Opus 5.5

The practical takeaway is that effort settings do not transfer across models: teams reusing old configurations for Opus 5.5 may overspend or trigger refusals from leftover reasoning-extraction instructions. The checklist-based harness pattern for preventing premature end_turn stops is directly reusable in long-running agent workflows. Developers running unattended coding, audit or migration tasks on the Claude API will get the most value from the guide.

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