diff --git a/packages/core/src/core/modalityDefaults.test.ts b/packages/core/src/core/modalityDefaults.test.ts
index 8406363d901..82b00d3e5c9 100644
--- a/packages/core/src/core/modalityDefaults.test.ts
+++ b/packages/core/src/core/modalityDefaults.test.ts
@@ -202,6 +202,17 @@ describe('defaultModalities', () => {
     it('returns text-only for deepseek-reasoner', () => {
       expect(defaultModalities('deepseek-reasoner')).toEqual({});
     });
+
+    // (QwenLM/qwen-code#10270)
+    it('returns text-only for non-vision deepseek-v4-flash', () => {
+      expect(defaultModalities('deepseek-v4-flash')).toEqual({});
+    });
+
+    it('returns image for deepseek-v4-flash-vision-exp', () => {
+      const m = defaultModalities('deepseek-v4-flash-vision-exp');
+      expect(m.image).toBe(true);
+      expect(m.pdf).toBeUndefined();
+    });
   });
 
   describe('Zhipu GLM', () => {
@@ -211,6 +222,25 @@ describe('defaultModalities', () => {
       expect(m.pdf).toBeUndefined();
     });
 
+    // (QwenLM/qwen-code#10270)
+    it('returns image for glm-4.6v', () => {
+      const m = defaultModalities('glm-4.6v');
+      expect(m.image).toBe(true);
+      expect(m.pdf).toBeUndefined();
+    });
+
+    it('returns image for glm-5v-turbo', () => {
+      const m = defaultModalities('glm-5v-turbo');
+      expect(m.image).toBe(true);
+      expect(m.pdf).toBeUndefined();
+    });
+
+    it('returns image for glm-5.3-flash', () => {
+      const m = defaultModalities('glm-5.3-flash');
+      expect(m.image).toBe(true);
+      expect(m.pdf).toBeUndefined();
+    });
+
     it('returns text-only for glm-5', () => {
       expect(defaultModalities('glm-5')).toEqual({});
     });
@@ -218,6 +248,10 @@ describe('defaultModalities', () => {
     it('returns text-only for glm-4.7', () => {
       expect(defaultModalities('glm-4.7')).toEqual({});
     });
+
+    it('returns text-only for glm-4.6 (no v suffix)', () => {
+      expect(defaultModalities('glm-4.6')).toEqual({});
+    });
   });
 
   describe('MiniMax', () => {
diff --git a/packages/core/src/core/modalityDefaults.ts b/packages/core/src/core/modalityDefaults.ts
index d8adce67bb6..e70728688bc 100644
--- a/packages/core/src/core/modalityDefaults.ts
+++ b/packages/core/src/core/modalityDefaults.ts
@@ -61,14 +61,19 @@ const MODALITY_PATTERNS: Array<[RegExp, InputModalities]> = [
   [/^qwen/, {}],
 
   // -------------------
-  // DeepSeek — text-only
+  // DeepSeek — text-only, except explicit vision variants
+  // (QwenLM/qwen-code#10270)
   // -------------------
+  [/^deepseek-.*vision/, { image: true }],
   [/^deepseek/, {}],
 
   // -------------------
-  // Zhipu GLM
+  // Zhipu GLM — v-suffix ids are vision models; others are text-only
+  // (QwenLM/qwen-code#10270)
   // -------------------
-  [/^glm-4\.5v/, { image: true }],
+  [/^glm-[0-9.]+v/, { image: true }],
+  // glm-5.3-flash natively integrates vision input (no v suffix)
+  [/^glm-5\.3-flash/, { image: true }],
   [/^glm-5(?:-|$)/, {}],
   [/^glm-/, {}],