Z.ai Anthropic endpoint reads output_config.effort and accepts all 5 Claude Code levels, but GLM 5.3 has only low/high/max natively: medium -> low, xhigh -> high (measured, not documented by Z.ai). ai-glm now starts on xhigh instead of max. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>