用户 @bridgemindai 披露一次编码会话花费 $321,其中 Fable 5 仅完成 $78(约 25%),而 Opus 4.8 被回退调用完成 $242(约 75%)。原因在于 Fable 5 的新分类器将常规编码提示误判为网络安全风险,导致大部分工作自动路由到更昂贵的 Opus 模型。Anthropic 曾称仅极少数任务会触发 fallback,但该用户实际体验与此不符。
This may be an extreme case but it still shows how quickly Fable 5 classifiers can reroute routine coding to Opus.
The session routed 75% of its work to Opus because the new classifiers kept misreading the coding prompts here as a cybersecurity issue.