diff --git a/open-sse/translator/paramSupport.ts b/open-sse/translator/paramSupport.ts
index 08e0e807a4..a0a3a70bab 100644
--- a/open-sse/translator/paramSupport.ts
+++ b/open-sse/translator/paramSupport.ts
@@ -29,6 +29,9 @@ const STRIP_RULES: StripRule[] = [
       /claude/i.test(m) && !/claude.*(opus|sonnet).*4\.6/i.test(m),
     drop: ["thinking", "reasoning_effort"],
   },
+  // NVIDIA NIM z-ai/glm-5.2: OpenAI-compatible wrapper rejects the `reasoning`
+  // body field → HTTP 400 "Unsupported parameter(s): `reasoning`". #6102 drop pattern.
+  { provider: "nvidia", match: /z-ai\/glm-5\.2\b/i, drop: ["reasoning"] },
   // NVIDIA NIM minimaxai/minimax-m2.7: NVIDIA's OpenAI-compatible wrapper
   // (format:"openai") does not accept the Claude-style `thinking` body field
   // and returns 400 "Unsupported parameter(s): thinking". Upstream #2268.
diff --git a/tests/unit/executors-strip-unsupported-params.test.ts b/tests/unit/executors-strip-unsupported-params.test.ts
index d1896408c4..e9169d731f 100644
--- a/tests/unit/executors-strip-unsupported-params.test.ts
+++ b/tests/unit/executors-strip-unsupported-params.test.ts
@@ -5,6 +5,7 @@
 //   1. claude-opus-4 series: temperature deprecated → Anthropic 400.
 //   2. github + gpt-5.4: temperature unsupported.
 //   3. github + Claude (except opus/sonnet 4.6): thinking + reasoning_effort rejected.
+//   4. nvidia + z-ai/glm-5.2: reasoning rejected → NVIDIA 400.
 
 import { test } from "node:test";
 import assert from "node:assert/strict";
@@ -112,6 +113,47 @@ test("stripUnsupportedParams: missing model is a no-op", () => {
   assert.equal(body.temperature, 0.7);
 });
 
+test("stripUnsupportedParams: drops reasoning for nvidia z-ai/glm-5.2", () => {
+  const body: Record<string, unknown> = {
+    model: "z-ai/glm-5.2",
+    reasoning: { effort: "high" },
+    temperature: 0.7,
+  };
+  stripUnsupportedParams("nvidia", "z-ai/glm-5.2", body);
+  assert.equal(body.reasoning, undefined, "reasoning must be stripped");
+  assert.equal(body.temperature, 0.7, "other params must survive");
+  assert.equal(body.model, "z-ai/glm-5.2", "model must not be touched");
+});
+
+test("stripUnsupportedParams: nvidia z-ai/glm-5.1 keeps reasoning (rule is 5.2-only)", () => {
+  const body: Record<string, unknown> = {
+    model: "z-ai/glm-5.1",
+    reasoning: { effort: "medium" },
+    max_tokens: 100,
+  };
+  stripUnsupportedParams("nvidia", "z-ai/glm-5.1", body);
+  assert.ok(body.reasoning !== undefined, "reasoning must survive for glm-5.1");
+  assert.equal(body.max_tokens, 100, "other params must survive");
+});
+
+test("stripUnsupportedParams: nvidia glm-5 rule is provider-scoped (no-op for other providers)", () => {
+  const body: Record<string, unknown> = {
+    model: "z-ai/glm-5.2",
+    reasoning: { effort: "high" },
+  };
+  stripUnsupportedParams("openai", "z-ai/glm-5.2", body);
+  assert.ok(body.reasoning !== undefined, "reasoning must survive for non-nvidia provider");
+});
+
+test("stripUnsupportedParams: nvidia non-glm-5 model keeps reasoning", () => {
+  const body: Record<string, unknown> = {
+    model: "deepseek-ai/deepseek-v4-pro",
+    reasoning: { effort: "high" },
+  };
+  stripUnsupportedParams("nvidia", "deepseek-ai/deepseek-v4-pro", body);
+  assert.ok(body.reasoning !== undefined, "reasoning must survive for non-glm-5 nvidia model");
+});
+
 test("STRIP_RULES is non-empty and every rule has a drop list", () => {
   assert.ok(__STRIP_RULES_FOR_TEST.length > 0);
   for (const rule of __STRIP_RULES_FOR_TEST) {