diff --git a/changelog.d/fixes/13847-combo-multimodal-capability.md b/changelog.d/fixes/13847-combo-multimodal-capability.md
new file mode 100644
index 0000000000..9f5cf33b5e
--- /dev/null
+++ b/changelog.d/fixes/13847-combo-multimodal-capability.md
@@ -0,0 +1 @@
+- **fix(combos):** Keep vision capability consistent for MiMo V2.5 and Step 3.7 Flash provider/free variants so `/v1/combos` no longer under-reports multimodal combos whose members are already advertised as vision-capable by `/v1/models` ([#13847](https://github.com/diegosouzapw/OmniRoute/issues/13847)).
diff --git a/src/shared/constants/visionModels.ts b/src/shared/constants/visionModels.ts
index bcad514058..e03b3799c1 100644
--- a/src/shared/constants/visionModels.ts
+++ b/src/shared/constants/visionModels.ts
@@ -34,6 +34,14 @@ export const VISION_MODEL_ID_FRAGMENTS = [
   "minicpm-v",
   "moondream",
   "mimo-vl",
+  // #13847: MiMo V2.5 is multimodal across the provider aliases that expose it
+  // (including `*-free` variants). Keep the known text-only Pro siblings out in
+  // isVisionModelId() below so this shared heuristic stays safe for routing,
+  // `/v1/models`, combo projection and lite compression alike.
+  "mimo-v2.5",
+  // #13847: Step 3.7 Flash is exposed through provider-qualified `:free` routes
+  // as well as direct registry entries. The capability must survive that suffix.
+  "step-3.7-flash",
   "kimi-vl",
   "glm-4v",
   "glm-4.5v",
@@ -74,5 +82,13 @@ export const VISION_MODEL_ID_FRAGMENTS = [
 export function isVisionModelId(modelId: string | null | undefined): boolean {
   if (!modelId) return false;
   const normalized = String(modelId).toLowerCase();
+
+  // Xiaomi documents the Pro chat variants as text-only even though the base
+  // MiMo V2.5 model is multimodal. Keep these exclusions beside the shared
+  // heuristic so every consumer gets the same verdict instead of relying on a
+  // resolver-specific exception.
+  if (/(?:^|\/)mimo-v2\.5-pro(?:$|[:/])/i.test(normalized)) return false;
+  if (/(?:^|\/)mimo-v2-pro(?:$|[:/])/i.test(normalized)) return false;
+
   return VISION_MODEL_ID_FRAGMENTS.some((fragment) => normalized.includes(fragment));
 }
diff --git a/tests/unit/combo-multimodal-capability-13847.test.ts b/tests/unit/combo-multimodal-capability-13847.test.ts
new file mode 100644
index 0000000000..57f74dd4c0
--- /dev/null
+++ b/tests/unit/combo-multimodal-capability-13847.test.ts
@@ -0,0 +1,51 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { getResolvedModelCapabilities } from "../../src/lib/modelCapabilities.ts";
+import { computeComboCapabilities } from "../../src/app/api/v1/combos/projectCombo.ts";
+
+const REPORTED_VISION_MEMBERS = [
+  "opencode-go/mimo-v2.5",
+  "kilo-gateway/stepfun/step-3.7-flash:free",
+  "opencode-zen/mimo-v2.5-free",
+  "opencode/mimo-v2.5-free",
+  "command-code/xiaomi/mimo-v2.5",
+] as const;
+
+test("#13847 reported combo members resolve as vision-capable", () => {
+  for (const model of REPORTED_VISION_MEMBERS) {
+    assert.equal(
+      getResolvedModelCapabilities(model).supportsVision,
+      true,
+      `${model} should retain its vision capability through provider/free-route qualification`
+    );
+  }
+});
+
+test("#13847 known MiMo Pro text-only siblings stay excluded", () => {
+  for (const model of [
+    "mimo-v2.5-pro",
+    "command-code/xiaomi/mimo-v2.5-pro",
+    "mimo-v2-pro",
+  ]) {
+    assert.notEqual(
+      getResolvedModelCapabilities(model).supportsVision,
+      true,
+      `${model} must not inherit the MiMo V2.5 multimodal heuristic`
+    );
+  }
+});
+
+test("#13847 combo projection agrees with vision-capable members", () => {
+  const combo = {
+    name: "default-observer",
+    strategy: "priority",
+    models: REPORTED_VISION_MEMBERS.map((model) => ({ kind: "model", model })),
+  };
+
+  assert.deepEqual(computeComboCapabilities(combo), {
+    multimodal: true,
+    reasoning: true,
+    caching: false,
+  });
+});