diff --git a/src/types/index.ts b/src/types/index.ts
index c41d9bb..d1dfb7d 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -9,13 +9,20 @@ export const LMStudioLoadedInstanceSchema = z.looseObject({
   }),
 })
 
+/**
+ * Reasoning levels LM Studio is known to publish. Kept as documentation only:
+ * the schema accepts any string so a level added by a newer LM Studio build
+ * cannot fail validation for the whole response.
+ */
+export const KNOWN_REASONING_LEVELS = ["off", "on", "low", "medium", "high"] as const
+
 /** Capabilities reported for a native v1 LLM record. */
 export const LMStudioCapabilitiesSchema = z.looseObject({
   vision: z.boolean(),
   trained_for_tool_use: z.boolean(),
   reasoning: z.looseObject({
-    allowed_options: z.array(z.enum(["off", "on", "low", "medium", "high"])),
-    default: z.enum(["off", "on", "low", "medium", "high"]),
+    allowed_options: z.array(z.string()),
+    default: z.string(),
   }).optional(),
 })
 
diff --git a/test/plugin.test.ts b/test/plugin.test.ts
index 4aa1446..584fea4 100644
--- a/test/plugin.test.ts
+++ b/test/plugin.test.ts
@@ -98,6 +98,26 @@ describe("LM Studio native API v1", () => {
     )
   })
 
+  it("keeps discovering when a model reports a reasoning level this release predates", async () => {
+    const fetcher = vi.fn(async () => modelsResponse([
+      model({
+        capabilities: {
+          vision: false,
+          trained_for_tool_use: true,
+          reasoning: { allowed_options: ["off", "low", "medium", "xhigh", "on"], default: "xhigh" },
+        },
+      }),
+      model({ key: "publisher/second", display_name: "Second" }),
+    ]))
+
+    const response = await discoverModels("http://127.0.0.1:1234", {
+      fetch: fetcher as typeof fetch,
+    })
+
+    expect(response.models).toHaveLength(2)
+    expect(response.models[0]?.capabilities?.reasoning?.default).toBe("xhigh")
+  })
+
   it("rejects HTTP-200 error bodies instead of treating status as endpoint support", async () => {
     const fetcher = vi.fn(async () => new Response(JSON.stringify({ error: "Unexpected endpoint" }), { status: 200 }))