把成功率拉到与 Fable 5 相近水平,DeepSeek 自验证单任务成本约 0.11 美元,不到后者的十分之一。
把成功率拉到与 Fable 5 相近水平,DeepSeek 自验证单任务成本约 0.11 美元,不到后者的十分之一。
一个连自己都会答错的大模型,开始自己给自己挑答案了。
DeepSeek V4 Flash 在 Terminal-Bench 2.1 上对每个任务采样 5 条候选轨迹,自验证后的系统成功率达到 88%,超过 Claude Fable 5。
![图片[2]-DeepSeek V4 Flash不换模型,只靠「自验证」反超Fable 5 - AI资源导航站-AI资源导航站](https://www.aitube.vip/wp-content/uploads/2026/08/20260821_6a8811b5aec05.jpg)
没有额外接入更强的 GPT 或 Claude,生成和验证用的都是 DeepSeek V4 Flash。
把成功率拉到与 Fable 5 相近的水平,DeepSeek 自验证单任务成本约 0.11 美元,Fable 5 则约 1.3 美元,成本不到后者的十分之一。
在这组实验里,多采样几次后,正确解往往已经出现在候选中,真正拉开差距的是能不能把它选出来。
这组新实验来自斯坦福、UC Berkeley 和 NVIDIA Research 团队此前提出的 LLM-as-a-Verifier。它通过更细粒度的验证和排序,从 Agent 的多次尝试中筛选更可靠的结果。
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项目主页:
https://llm-as-a-verifier.com/
论文地址:
https://arxiv.org/pdf/2607.05391
代码地址:
https://github.com/llm-as-a-verifier/llm-as-a-verifier
API地址:
https://llm-as-a-verifier.com/docs/
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DeepSeek V4 Flash 的自验证实验
这组结果来自项目 8 月 14 日发布的 v0.2.0 更新,其中新增了 DeepSeek V4 Flash 验证支持和 Terminal-Bench 2.1 自验证基准。
从项目整体设计看,LLM-as-a-Verifier 不只用于测试时扩展,验证信号还可以用于进度跟踪和强化学习。
实验中,每个任务预先由 DeepSeek V4 Flash 生成 5 条 mini-swe-agent 执行轨迹。Best-of-3 使用其中前 3 条,Best-of-5 使用全部 5 条。
DeepSeek V4 Flash 同时负责给候选轨迹打分,LLM-as-a-Verifier 据此完成排序和选择,整个过程不需要再训练一个专门的验证模型。
效果并不只是小幅涨点。Best-of-3 将成功率从 79.4% 提到 86.5%,Best-of-5 则把 78.7% 直接推到 88.0%。
放到 Terminal-Bench 2.1 的成本—性能图里,差距更加直观。
DeepSeek 一侧使用 DeepSeek V4 Flash Max,成本按当时的 OpenRouter 定价计算。GPT-5.6 和 Claude 系列基线则沿用 GPT-5.6 技术报告中的结果。
上述成绩是系统级结果。DeepSeek 一侧加入了多次采样和 LLM-as-a-Verifier,Fable 5 一侧使用 Claude Code,因此不能直接视为两个基础模型在相同条件下的单次横评。
项目还公开了这组实验的候选执行轨迹,以及 Best-of-3、Best-of-5 对应的复现脚本。
Best-of-5 还有一个更关键的数字,Oracle(理想选择上限)达到 96.6%。
它说明,对大量任务来说,5 条候选里已经至少出现了一条成功轨迹。模型能够生成正确解,但验证器还没有把它们全部找出来。
原论文进一步汇总了 Terminal-Bench V2 排行榜中不同模型和 Agent 配置产生的执行轨迹,理想选择器下的任务覆盖率最高达到 98.9%。
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连续验证如何区分候选轨迹?
同一模型自验证并非让模型直接判断自己是否答对,而是先得到更细粒度的验证分数,再据此排序多个候选轨迹。
常见的 LLM-as-a-Judge 评估方式直接输出离散分数。两条质量不同的长执行轨迹,很可能同时得到 4 分或 5 分,离散评分无法继续区分二者。
原论文在 Terminal-Bench V2 上测得,单次离散评分的平局率达到 26.7%。
LLM-as-a-Verifier 不只读取最终分数,而是保留各个评分 token 的概率分布,再通过概率加权得到连续验证分数。
即使两个候选最终都输出 4 分,只要模型对不同评分档位的置信分布不同,仍然能够进一步拉开差距。
框架还进一步使用更细的评分粒度,并通过重复评估降低单次判断的波动,同时将整体评价拆成多个维度分别判断。
![图片[72]-DeepSeek V4 Flash不换模型,只靠「自验证」反超Fable 5 - AI资源导航站-AI资源导航站](https://www.aitube.vip/wp-content/uploads/2026/08/20260821_6a8811fab4922.jpg)
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面对更多候选,框架使用 Probabilistic Pivot Tournament(PPT,概率枢轴锦标赛)进行排序,将完整的 两两比较降至 。
![图片[93]-DeepSeek V4 Flash不换模型,只靠「自验证」反超Fable 5 - AI资源导航站-AI资源导航站](https://www.aitube.vip/wp-content/uploads/2026/08/20260821_6a88120ec8624.jpg)
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自验证的测试时扩展
低成本也不只来自模型价格。这次更新还专门优化了验证阶段的前缀缓存,Terminal-Bench 2.1 上缓存命中率从 5.2% 提升到 78.4%,未缓存输入成本也随之大幅下降。
测试时预算可以有不同的分配方式。选择更强的模型、增加采样次数,或把更多计算投入候选验证和选择,都会改变整套系统的成本—性能权衡。
5 次采样的实际结果距离 96.6% 的理想选择上限仍有明显差距。
下一步最直接的提升空间,就在把现有候选选得更准。
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