diff --git a/src/agents/model-selection.test.ts b/src/agents/model-selection.test.ts
index c98fe91fcae..c8f1bc75f7d 100644
--- a/src/agents/model-selection.test.ts
+++ b/src/agents/model-selection.test.ts
@@ -2529,6 +2529,72 @@ describe("model-selection", () => {
       expect(resolveAnthropicOpusThinking(cfg)).toBe("adaptive");
     });
 
+    it("treats params.thinking=false as off (#74374)", () => {
+      const cfg = {
+        agents: {
+          defaults: {
+            models: {
+              "deepseek/deepseek-v4-pro": {
+                params: { thinking: false },
+              },
+            },
+          },
+        },
+      } as OpenClawConfig;
+
+      expect(
+        resolveThinkingDefault({
+          cfg,
+          provider: "deepseek",
+          model: "deepseek-v4-pro",
+        }),
+      ).toBe("off");
+    });
+
+    it('treats params.thinking="disabled" as off (#74374)', () => {
+      const cfg = {
+        agents: {
+          defaults: {
+            models: {
+              "deepseek/deepseek-v4-pro": {
+                params: { thinking: "disabled" },
+              },
+            },
+          },
+        },
+      } as OpenClawConfig;
+
+      expect(
+        resolveThinkingDefault({
+          cfg,
+          provider: "deepseek",
+          model: "deepseek-v4-pro",
+        }),
+      ).toBe("off");
+    });
+
+    it('treats params.thinking="none" as off', () => {
+      const cfg = {
+        agents: {
+          defaults: {
+            models: {
+              "deepseek/deepseek-v4-pro": {
+                params: { thinking: "none" },
+              },
+            },
+          },
+        },
+      } as OpenClawConfig;
+
+      expect(
+        resolveThinkingDefault({
+          cfg,
+          provider: "deepseek",
+          model: "deepseek-v4-pro",
+        }),
+      ).toBe("off");
+    });
+
     it("keeps thinking off by default for explicitly configured Anthropic Opus 4.7", () => {
       const cfg = {
         agents: {
diff --git a/src/agents/model-thinking-default.ts b/src/agents/model-thinking-default.ts
index e3cbb766a52..f0a67361a29 100644
--- a/src/agents/model-thinking-default.ts
+++ b/src/agents/model-thinking-default.ts
@@ -41,6 +41,14 @@ export function resolveThinkingDefault(params: {
   const perModelThinking =
     configuredModels?.[canonicalKey]?.params?.thinking ??
     (legacyKey ? configuredModels?.[legacyKey]?.params?.thinking : undefined);
+  // Accept boolean false and common disable aliases as "off".
+  if (
+    perModelThinking === false ||
+    perModelThinking === "disabled" ||
+    perModelThinking === "none"
+  ) {
+    return "off";
+  }
   if (
     perModelThinking === "off" ||
     perModelThinking === "minimal" ||
diff --git a/src/auto-reply/reply/model-selection.test.ts b/src/auto-reply/reply/model-selection.test.ts
index 7f3ad02c737..67399d1ddf2 100644
--- a/src/auto-reply/reply/model-selection.test.ts
+++ b/src/auto-reply/reply/model-selection.test.ts
@@ -145,6 +145,43 @@ describe("createModelSelectionState catalog loading", () => {
     expect(loadModelCatalog).not.toHaveBeenCalled();
   });
 
+  it("keeps per-model disabled params.thinking ahead of global thinkingDefault", async () => {
+    vi.mocked(loadModelCatalog).mockClear();
+    const cfg = {
+      agents: {
+        defaults: {
+          thinkingDefault: "low",
+          models: {
+            "deepseek/deepseek-v4-pro": {
+              params: { thinking: false },
+            },
+          },
+        },
+      },
+      models: {
+        providers: {
+          deepseek: {
+            baseUrl: "https://api.deepseek.com/v1",
+            models: [makeConfiguredModel({ id: "deepseek-v4-pro", name: "DeepSeek V4 Pro" })],
+          },
+        },
+      },
+    } as OpenClawConfig;
+
+    const state = await createModelSelectionState({
+      cfg,
+      agentCfg: cfg.agents?.defaults,
+      defaultProvider: "deepseek",
+      defaultModel: "deepseek-v4-pro",
+      provider: "deepseek",
+      model: "deepseek-v4-pro",
+      hasModelDirective: false,
+    });
+
+    await expect(state.resolveDefaultThinkingLevel()).resolves.toBe("off");
+    expect(loadModelCatalog).not.toHaveBeenCalled();
+  });
+
   it("uses the implicit model default when no global thinking default is configured", async () => {
     vi.mocked(loadModelCatalog).mockClear();
     const cfg = {
diff --git a/src/auto-reply/reply/model-selection.ts b/src/auto-reply/reply/model-selection.ts
index 1631d010187..954eb04df2e 100644
--- a/src/auto-reply/reply/model-selection.ts
+++ b/src/auto-reply/reply/model-selection.ts
@@ -469,6 +469,14 @@ export async function createModelSelectionState(params: {
     const configuredModelThinkingDefault =
       configuredModels?.[canonicalKey]?.params?.thinking ??
       (legacyKey ? configuredModels?.[legacyKey]?.params?.thinking : undefined);
+    if (
+      configuredModelThinkingDefault === false ||
+      configuredModelThinkingDefault === "disabled" ||
+      configuredModelThinkingDefault === "none"
+    ) {
+      defaultThinkingLevel = "off";
+      return defaultThinkingLevel;
+    }
     if (
       configuredModelThinkingDefault === "off" ||
       configuredModelThinkingDefault === "minimal" ||