diff --git a/apps/web/src/lib/ai-gateway/providers/model-settings.test.ts b/apps/web/src/lib/ai-gateway/providers/model-settings.test.ts
new file mode 100644
index 0000000000..348bf92489
--- /dev/null
+++ b/apps/web/src/lib/ai-gateway/providers/model-settings.test.ts
@@ -0,0 +1,27 @@
+import { MINIMAX_CURRENT_MODEL_ID } from './minimax';
+import { getModelVariants } from './model-settings';
+
+describe('MiniMax model variants', () => {
+  it.each([MINIMAX_CURRENT_MODEL_ID, 'opencode-go/minimax-m3'])(
+    'defaults to thinking while exposing instant for MiniMax M3 model %s',
+    model => {
+      const variants = getModelVariants(model);
+
+      expect(Object.keys(variants ?? {})).toEqual(['thinking', 'instant']);
+      expect(variants).toEqual({
+        thinking: { reasoning: { enabled: true, effort: 'high' } },
+        instant: { reasoning: { enabled: false, effort: 'none' } },
+      });
+    }
+  );
+
+  it('keeps instant as the default for older MiniMax models', () => {
+    const variants = getModelVariants('minimax/minimax-m2.7');
+
+    expect(Object.keys(variants ?? {})).toEqual(['instant', 'thinking']);
+    expect(variants).toEqual({
+      instant: { reasoning: { enabled: false, effort: 'none' } },
+      thinking: { reasoning: { enabled: true, effort: 'high' } },
+    });
+  });
+});
diff --git a/apps/web/src/lib/ai-gateway/providers/model-settings.ts b/apps/web/src/lib/ai-gateway/providers/model-settings.ts
index 52ff151945..b14fa072a8 100644
--- a/apps/web/src/lib/ai-gateway/providers/model-settings.ts
+++ b/apps/web/src/lib/ai-gateway/providers/model-settings.ts
@@ -25,8 +25,15 @@ const REASONING_VARIANTS_THINKING_ONLY = {
   thinking: { reasoning: { enabled: true, effort: 'high' } },
 } as const;
 
+const REASONING_DISABLED = { reasoning: { enabled: false, effort: 'none' } } as const;
+
+const REASONING_VARIANTS_THINKING_INSTANT = {
+  ...REASONING_VARIANTS_THINKING_ONLY,
+  instant: REASONING_DISABLED,
+} as const;
+
 export const REASONING_VARIANTS_BINARY = {
-  instant: { reasoning: { enabled: false, effort: 'none' } },
+  instant: REASONING_DISABLED,
   ...REASONING_VARIANTS_THINKING_ONLY,
 } as const;
 
@@ -107,6 +114,9 @@ export function getModelVariants(model: string): OpenCodeSettings['variants'] {
   if (model.includes('kimi-k2.7-code')) {
     return REASONING_VARIANTS_THINKING_ONLY;
   }
+  if (isMinimaxModel(model) && model.toLowerCase().includes('minimax-m3')) {
+    return REASONING_VARIANTS_THINKING_INSTANT;
+  }
   if (
     isMinimaxModel(model) ||
     isKimiModel(model) ||