GoKawiilAnthropic publishes prompting guide for Claude Opus 5.5
Anthropic released documentation detailing how to prompt its Claude Opus 5.5 model, highlighting behavioral differences from Claude Opus 5 including effort calibration, thinking behavior, and handling of unattended multiagent tasks. The guide notes Opus 5.5 generates output over 30% faster than its predecessor while typically using fewer tokens to complete the same task, and that existing Opus 5 prompts should still work without modification.