[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"news-1e7d0673-aecc-42b5-8560-92a2b4d4daf6":3},{"id":4,"title":5,"summary":6,"original_url":7,"source_id":8,"tags":9,"published_at":23,"created_at":24,"modified_at":25,"is_published":26,"publish_type":27,"image_url":13,"view_count":28},"1e7d0673-aecc-42b5-8560-92a2b4d4daf6","快手 KAT-Coder-V2.5 把 Agentic Coding 训练改写成基础设施工程","快手 KwaiKAT 团队 7 月 26 日发布 KAT-Coder-V2.5,在统一 Claude Code harness 下 PinchBench 拿到 94.9 分,首次压过 Claude Opus 4.8 的 93.5;同时把 35B 总参 \u002F 3B 激活的 MoE 变体 KAT-Coder-V2.5-Dev 以 Apache-2.0 推到 Hugging Face。\n\n但比刷榜更值得拆的是训练栈底下的工程改造。KwaiKAT 最初把 RL 曲线的迟缓归罪到算法本身,审计后才发现 16% 的轨迹失败来自 sandbox,不是策略。沙箱镜像把磁盘用到 95%,让超时 invalid rollout 占 6%–7%;远端 sandbox 初始化的环境变量错位再误翻 6%–7% 的 reward;Gateway Server 套的 chat 端点在 ~200 turn 规模上制造 40% 的 token drift。三项基础设施改动叠加之后,sandbox 反馈错误率从 16% 压到 2% 以下,训练塌陷减少一个数量级。\n\n支撑这层的是 AutoBuilder:把可执行环境构建成功率从 16.5% 拉到 57.2%,堆出 10 万+ 个跨 12 种语言的可验证仓库任务,每个任务都是「golden patch + test patch + 自动生成的三段式描述」三元组,验证不读 exit code,而是解析结构化测试输出,要求 ≥90% 的预期测试在多次运行中复现。数据飞轮也不只过滤「最终 pass」的轨迹,而是给「接近 pass」的任务加 process-level hints,让 0 通过子集回到 ~20% 通过率,再以 hint-free 重放洗掉泄漏。\n\n开源变体 KAT-Coder-V2.5-Dev 的底子是 Qwen3.6-35B-A3B 加 127K SFT 与 RL 后训练。这意味着 agentic coding 能力可以以 35B 总参、3B 激活的 MoE 形态在单卡 4-bit 量化下跑通,Qwen 系开源生态又多了一块拼图。Agentic coding 的下一程竞争,不在模型多大,而在沙箱稳不稳、数据过不过滤、reward 会不会被 hacking。KAT-Coder-V2.5 的真正卖点不是 PinchBench 那一分,而是把 RL 训练从「算法题」改写成了「基础设施题」。","https:\u002F\u002Farxiv.org\u002Fabs\u002F2607.05471","7437aeb9-930c-4866-a2e9-48003c1a792b",[10,14,17,20],{"id":11,"name":12,"slug":12,"description":13,"color":13},"e82b2d09-81b2-43d1-977e-e018443b3c14","coding-agent",null,{"id":15,"name":16,"slug":16,"description":13,"color":13},"01598627-1ea6-4b27-a5d8-874971571a71","llm",{"id":18,"name":19,"slug":19,"description":13,"color":13},"7e89b5cc-57db-4f37-bc6d-28919a73931c","model-release",{"id":21,"name":22,"slug":22,"description":13,"color":13},"b9bd9039-fcdb-41a8-b85b-fc1587def2b9","open-source","2026-07-27T06:00:00Z","2026-07-27T00:06:24.213127Z","2026-07-27T00:06:24.213135Z",true,"agent",3]