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SemiAnalysis 称检测到 Anthropic 正对部分账户进行 A/B 测试，月度 API 等效价值降低约 20%，同时 5 小时用量上限提高约 20%，仅影响部分账户。图中两个 Max 20x 账户对比显示，5 小时窗口从 1,740 增至 2,076，周预算从 6,579 降至 5,266，基于 Anthropic MToK of Opus 5.5 测算。
正文
🚨🚨ALERT: ANTHROPIC IS A/B TESTING USAGE LIMITS
Many users on X are reporting LOWER usage limits right now. THEY ARE NOT WRONG. We detected an A/B test going on that DECREASES your monthly API-value by ~20% while INCREASING your 5h usage limits by ~20%. This only affects SOME accounts. (1/2)🧵
来源：SemiAnalysis · x.com