diff --git a/extensions/ollama/src/stream-runtime.test.ts b/extensions/ollama/src/stream-runtime.test.ts
index a34862aaf4c..4fc712f26bd 100644
--- a/extensions/ollama/src/stream-runtime.test.ts
+++ b/extensions/ollama/src/stream-runtime.test.ts
@@ -1246,6 +1246,35 @@ describe("createOllamaStreamFn", () => {
     );
   });
 
+  it("maps configured native Ollama params.thinking=max to the stable top-level think value", async () => {
+    await withMockNdjsonFetch(
+      [
+        '{"model":"m","created_at":"t","message":{"role":"assistant","content":"ok"},"done":false}',
+        '{"model":"m","created_at":"t","message":{"role":"assistant","content":""},"done":true,"prompt_eval_count":1,"eval_count":1}',
+      ],
+      async (fetchMock) => {
+        const stream = await createOllamaTestStream({
+          baseUrl: "http://ollama-host:11434",
+          model: { params: { thinking: "max" } },
+        });
+
+        const events = await collectStreamEvents(stream);
+        expect(events.at(-1)?.type).toBe("done");
+
+        const requestInit = getGuardedFetchCall(fetchMock).init ?? {};
+        if (typeof requestInit.body !== "string") {
+          throw new Error("Expected string request body");
+        }
+        const requestBody = JSON.parse(requestInit.body) as {
+          think?: string;
+          options?: { think?: string };
+        };
+        expect(requestBody.think).toBe("high");
+        expect(requestBody.options?.think).toBeUndefined();
+      },
+    );
+  });
+
   it("uses the default loopback policy when baseUrl is empty", async () => {
     await withMockNdjsonFetch(
       [
diff --git a/extensions/ollama/src/stream.ts b/extensions/ollama/src/stream.ts
index 29fd46523d1..aeac03084c5 100644
--- a/extensions/ollama/src/stream.ts
+++ b/extensions/ollama/src/stream.ts
@@ -152,7 +152,7 @@ export function wrapOllamaCompatNumCtx(baseFn: StreamFn | undefined, numCtx: num
     });
 }
 
-type OllamaThinkValue = boolean | "low" | "medium" | "high" | "max";
+type OllamaThinkValue = boolean | "low" | "medium" | "high";
 
 const OLLAMA_OPTION_PARAM_KEYS = new Set([
   "num_keep",
@@ -215,9 +215,15 @@ function resolveOllamaThinkParamValue(
   if (raw === "off") {
     return false;
   }
-  if (raw === "low" || raw === "medium" || raw === "high" || raw === "max") {
+  if (raw === "low" || raw === "medium" || raw === "high") {
     return raw;
   }
+  if (raw === "minimal") {
+    return "low";
+  }
+  if (raw === "xhigh" || raw === "adaptive" || raw === "max") {
+    return "high";
+  }
   return undefined;
 }