Anthropic 宣布自 7 月 12 日起，旗下订阅用户若要使用高阶 AI 模型 Claude Fable 5，除了支付既有的月费外，还需要额外支付基于使用量（代币数量）的费用。这是主流 AI 实验室首次针对消费级 AI 模型引入按量付费的收费模式，打破了以往单一月费无限使用的常规。

这项收费变革反映了 AI 行业在面对高昂运算成本时的必然趋势。由于 Fable 5 等新一代模型在回答问题时会消耗大量隐藏的思考链代币，传统的定额订阅制在运算需求庞大的 AI 智能体时代已逐渐显得不切实际，促使开发商转向按量收费以维持营运。

此次定价调整也是对消费者付费意愿的一场测试。尽管 Claude 的用户增长迅速，但面对 OpenAI 和 Google 等对手的竞争，Anthropic 选择走高端路线，这意味著早期由补贴支撑的消费级 AI 无限订阅「黄金时代」可能正走向终结。

Anthropic announced that starting July 12, subscribers must pay additional usage-based fees based on token consumption to access its advanced Claude Fable 5 model. This marks the first time a major AI lab has introduced pay-as-you-go billing for a consumer-facing model, departing from the traditional flat-rate subscription.

This pricing shift reflects an inevitable industry trend driven by high computational costs. Since advanced models like Fable 5 consume massive amounts of tokens through hidden chain-of-thought processes, flat-rate subscriptions are becoming unsustainable in the era of resource-heavy AI agents, forcing a transition to usage-based pricing.

This billing change serves as a key test of consumer willingness to pay for premium AI models. While Claude's user base is growing rapidly alongside OpenAI and Google, Anthropic's move to target high-end users suggests that the subsidized "golden era" of unlimited consumer AI subscriptions is coming to an end.