diff --git a/.changeset/acp-model-toggle-case.md b/.changeset/acp-model-toggle-case.md
new file mode 100644
index 000000000..5565e8768
--- /dev/null
+++ b/.changeset/acp-model-toggle-case.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Detect ACP toggleable thinking models case-insensitively.
diff --git a/packages/acp-adapter/src/model-catalog.ts b/packages/acp-adapter/src/model-catalog.ts
index e126362b4..67c883e3f 100644
--- a/packages/acp-adapter/src/model-catalog.ts
+++ b/packages/acp-adapter/src/model-catalog.ts
@@ -52,7 +52,7 @@ export function deriveThinkingSupported(alias: ModelAlias): boolean {
   if (declared.includes('thinking') || declared.includes('always_thinking')) return true;
   const lower = alias.model.toLowerCase();
   if (lower.includes('thinking') || lower.includes('reason')) return true;
-  if (TOGGLEABLE_THINKING_MODELS.has(alias.model)) return true;
+  if (TOGGLEABLE_THINKING_MODELS.has(lower)) return true;
   return false;
 }
 
diff --git a/packages/acp-adapter/test/model-catalog.test.ts b/packages/acp-adapter/test/model-catalog.test.ts
index 59a340300..d60d0227b 100644
--- a/packages/acp-adapter/test/model-catalog.test.ts
+++ b/packages/acp-adapter/test/model-catalog.test.ts
@@ -21,6 +21,11 @@ describe('deriveThinkingSupported', () => {
     expect(deriveThinkingSupported(alias('some-thinking-model'))).toBe(true);
     expect(deriveThinkingSupported(alias('plain-model'))).toBe(false);
   });
+
+  it('matches toggleable model names case-insensitively', () => {
+    expect(deriveThinkingSupported(alias('Kimi-Code'))).toBe(true);
+    expect(deriveThinkingSupported(alias('Kimi-For-Coding'))).toBe(true);
+  });
 });
 
 describe('deriveAlwaysThinking', () => {