diff --git a/open-sse/handlers/responseSanitizer/reasoning.ts b/open-sse/handlers/responseSanitizer/reasoning.ts
index 867d455c84..b1a385003a 100644
--- a/open-sse/handlers/responseSanitizer/reasoning.ts
+++ b/open-sse/handlers/responseSanitizer/reasoning.ts
@@ -130,6 +130,7 @@ export function isTextualReasoningTagNativeRoute(providerId: string, modelId: st
     /deepseek[-_/]?r1\b/.test(routeId) ||
     /r1[-_/]?distill\b/.test(routeId) ||
     /(?:^|[/:_-])qwq(?:[/._:-]|$)/.test(routeId) ||
+    (providerId === "kimi-coding" && /(?:^|[/_-])k3(?:[/._:-]|$)/.test(modelId)) ||
     // 9router#2231: MiniMax M3 leaks raw <think>...</think> into `content` on its
     // OpenAI-format provider tiers (trae, huggingchat, bazaarlink, ollama-cloud,
     // opencode, cline, opencode-zen, codebuddy-cn). The direct minimax/minimax-cn
diff --git a/tests/unit/responsesanitizer-reasoning-split.test.ts b/tests/unit/responsesanitizer-reasoning-split.test.ts
index 1517d5db3b..f89529b21e 100644
--- a/tests/unit/responsesanitizer-reasoning-split.test.ts
+++ b/tests/unit/responsesanitizer-reasoning-split.test.ts
@@ -52,6 +52,21 @@ describe("responseSanitizer/reasoning — shouldParseTextualReasoningTags", () =
   });
 });
 
+describe("responseSanitizer/reasoning — Kimi Code K3 textual reasoning-tag route", () => {
+  it("extracts <think> blocks from the Kimi Code K3 route", () => {
+    const chunk = {
+      choices: [{ index: 0, delta: { content: "<think>reasoning here</think>final answer" } }],
+    };
+    const sanitized = sanitizeOpenAIResponse(chunk, {
+      parseTextualReasoningTags: shouldParseTextualReasoningTags("kimi-coding", "k3"),
+    }) as { choices: Array<{ delta: { content: string; reasoning_content?: string } }> };
+
+    const delta = sanitized.choices[0].delta;
+    assert.equal(delta.content, "final answer");
+    assert.equal(delta.reasoning_content, "reasoning here");
+  });
+});
+
 // ── MiniMax M3 textual reasoning-tag route (9router#2231) ──────────────────────
 //
 // MiniMax M3 leaks raw <think>...</think> into `content` instead of a separate