diff --git a/open-sse/providers/capabilities.js b/open-sse/providers/capabilities.js
index a9f8745a..dd9fa381 100644
--- a/open-sse/providers/capabilities.js
+++ b/open-sse/providers/capabilities.js
@@ -209,7 +209,10 @@ export const PROVIDER_CAPABILITIES = {
     "glm-5.3-flash":      { vision: true, reasoning: true, thinkingFormat: "openai", thinkingCanDisable: true, contextWindow: 1000000, maxOutput: 32000 },
     "kimi-k3-1":          { vision: true, reasoning: true, thinkingFormat: "openai", thinkingCanDisable: false, contextWindow: 1000000, maxOutput: 32000 },
     "deepseek-v4-pro":    { vision: true, reasoning: true, thinkingFormat: "openai", thinkingCanDisable: true, contextWindow: 1000000, maxOutput: 50000 },
-    "deepseek-v4-flash":  { vision: true, reasoning: true, thinkingFormat: "openai", thinkingCanDisable: true, contextWindow: 1000000, maxOutput: 50000 },
+    // deepseek-v4.1-flash replaces v4-flash (dropped from the server list;
+    // the old endpoint still answers 200 but the published list is the
+    // contract). maxOutput 128000 per the server's product-config payload.
+    "deepseek-v4.1-flash": { vision: true, reasoning: true, thinkingFormat: "openai", thinkingCanDisable: true, contextWindow: 1000000, maxOutput: 128000 },
   },
   // Qoder — upstream exposes opaque internal ids (dfmodel, kmodel, …); the
   // registry `name` is display-only and capability lookup matches on the raw
diff --git a/open-sse/providers/registry/codebuddy-cn.js b/open-sse/providers/registry/codebuddy-cn.js
index fdb53e68..672a05d8 100644
--- a/open-sse/providers/registry/codebuddy-cn.js
+++ b/open-sse/providers/registry/codebuddy-cn.js
@@ -58,7 +58,9 @@ export default {
     // (endpoint returns 11102 "model service info not found"), plus
     // glm-5.0-turbo / minimax-m2.7 / kimi-k2.5 / hy3-preview /
     // deepseek-v3-2-volc (absent from the server list, though still answering
-    // 200) and hy3-x (paid tier, not used here).
+    // 200) and hy3-x (paid tier, not used here). deepseek-v4-flash removed
+    // 2026-09: replaced server-side by deepseek-v4.1-flash (same low/high/
+    // xhigh efforts; endpoint still answers 200 but the list is the contract).
     // "-x" suffix = paid tier of the same model (free id rides the promo quota).
     { id: "hy3", name: "Hy3" },
     { id: "hy4-preview", name: "Hy4-Preview" },
@@ -66,7 +68,7 @@ export default {
     { id: "glm-5.3-flash", name: "GLM-5.3-Flash" },
     { id: "kimi-k3-1", name: "Kimi-K3" },
     { id: "deepseek-v4-pro", name: "DeepSeek-V4-Pro" },
-    { id: "deepseek-v4-flash", name: "DeepSeek-V4-Flash" },
+    { id: "deepseek-v4.1-flash", name: "DeepSeek-V4.1-Flash" },
   ],
   oauth: {
     baseUrl: "https://copilot.tencent.com",