diff --git a/changelog.d/fixes/13918-lemonade-vision-labels.md b/changelog.d/fixes/13918-lemonade-vision-labels.md
new file mode 100644
index 0000000000..0e20f291a9
--- /dev/null
+++ b/changelog.d/fixes/13918-lemonade-vision-labels.md
@@ -0,0 +1 @@
+- fix(providers): `detectVisionInput` now recognizes Lemonade Server's `labels[]` vision capability, so Lemonade vision models import with `supportsVision` set instead of being treated as text-only (#13918)
diff --git a/src/lib/providerModels/modelDiscovery.ts b/src/lib/providerModels/modelDiscovery.ts
index f2dcf77c15..5536c51544 100644
--- a/src/lib/providerModels/modelDiscovery.ts
+++ b/src/lib/providerModels/modelDiscovery.ts
@@ -41,12 +41,26 @@ function modalitiesIncludeImage(value: unknown): boolean {
   );
 }
 
+// #13918: Lemonade Server's GET /v1/models exposes capabilities only through a
+// `labels[]` string array (e.g. ["chat", "vision", "reasoning", "tool-calling"]) —
+// it has none of the modality/architecture fields the other shapes below read.
+// See https://lemonade-server.ai/docs/api/openai/. Exact (case-insensitive,
+// trimmed) membership test only — not a substring match, per the earlier
+// false-positive lesson with bare `gemma` id-fragment matching.
+function labelsIncludeVision(value: unknown): boolean {
+  return (
+    Array.isArray(value) &&
+    value.some((entry) => toNonEmptyString(entry)?.toLowerCase() === "vision")
+  );
+}
+
 /**
  * #4264: detect image-input (vision) capability from a discovered model record.
  * Handles the common upstream shapes: an explicit `supportsVision` flag, the
  * OpenRouter `architecture.input_modalities` array and string `architecture.modality`
- * ("text+image->text" — the input side is everything before "->"), and a top-level
- * `input_modalities` array. Returns false when the upstream exposes no modality info.
+ * ("text+image->text" — the input side is everything before "->"), a top-level
+ * `input_modalities` array, and (#13918) Lemonade Server's `labels[]` array.
+ * Returns false when the upstream exposes no modality info.
  */
 export function detectVisionInput(record: JsonRecord): boolean {
   if (record.supportsVision === true) return true;
@@ -60,6 +74,9 @@ export function detectVisionInput(record: JsonRecord): boolean {
     const [inputPart] = modality.toLowerCase().split("->");
     if ((inputPart || "").includes("image")) return true;
   }
+
+  if (labelsIncludeVision(record.labels)) return true;
+
   return false;
 }
 
diff --git a/tests/unit/lemonade-vision-labels-13918.test.ts b/tests/unit/lemonade-vision-labels-13918.test.ts
new file mode 100644
index 0000000000..67354ef83a
--- /dev/null
+++ b/tests/unit/lemonade-vision-labels-13918.test.ts
@@ -0,0 +1,86 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { detectVisionInput } from "@/lib/providerModels/modelDiscovery";
+
+// #13918: Lemonade Server's GET /v1/models exposes capabilities only through a
+// `labels[]` string array (chat, vision, reasoning, tool-calling, ...) -- it has
+// no `architecture.input_modalities` / `input_modalities` / `modality` field, so
+// detectVisionInput() never recognizes a vision-labelled Lemonade model.
+
+test("detectVisionInput recognizes a Lemonade record whose labels[] includes vision", () => {
+  const lemonadeRecord = {
+    id: "Gemma-4-26B-A4B",
+    object: "model",
+    owned_by: "lemonade",
+    checkpoint: "amd/gemma-4-26b-a4b",
+    recipe: "llamacpp",
+    size: 26000000000,
+    max_context_window: 262144,
+    context_length: 262144,
+    downloaded: true,
+    labels: ["chat", "vision", "reasoning", "tool-calling"],
+  };
+
+  assert.equal(
+    detectVisionInput(lemonadeRecord),
+    true,
+    "expected a Lemonade record labelled `vision` to be detected as vision-capable"
+  );
+});
+
+test("detectVisionInput stays false for a Lemonade record without the vision label", () => {
+  const textOnly = {
+    id: "Gemma-4-26B-A4B-text",
+    owned_by: "lemonade",
+    labels: ["chat", "tool-calling"],
+  };
+
+  assert.equal(detectVisionInput(textOnly), false);
+});
+
+test("detectVisionInput is case-insensitive and trims whitespace in labels[]", () => {
+  const mixedCase = {
+    id: "some-model",
+    owned_by: "lemonade",
+    labels: ["chat", " Vision "],
+  };
+
+  assert.equal(detectVisionInput(mixedCase), true);
+});
+
+test("detectVisionInput does not substring-match labels[] entries", () => {
+  const notVision = {
+    id: "some-model",
+    owned_by: "lemonade",
+    labels: ["chat", "revision-control"],
+  };
+
+  assert.equal(detectVisionInput(notVision), false);
+});
+
+test("detectVisionInput ignores non-array labels without throwing", () => {
+  assert.doesNotThrow(() => detectVisionInput({ id: "x", labels: "vision" as unknown }));
+  assert.equal(detectVisionInput({ id: "x", labels: "vision" as unknown }), false);
+  assert.doesNotThrow(() => detectVisionInput({ id: "x", labels: undefined }));
+  assert.equal(detectVisionInput({ id: "x", labels: {} as unknown }), false);
+});
+
+test("detectVisionInput leaves non-Lemonade shapes byte-identical (architecture.modality path)", () => {
+  const openRouterRecord = {
+    id: "some/vision-model",
+    architecture: {
+      modality: "text+image->text",
+    },
+  };
+
+  assert.equal(detectVisionInput(openRouterRecord), true);
+
+  const openRouterTextOnly = {
+    id: "some/text-model",
+    architecture: {
+      modality: "text->text",
+    },
+  };
+
+  assert.equal(detectVisionInput(openRouterTextOnly), false);
+});