diff --git a/changelog.d/maintenance/antigravity-nonstream-test-realign.md b/changelog.d/maintenance/antigravity-nonstream-test-realign.md
new file mode 100644
index 0000000000..b116718b81
--- /dev/null
+++ b/changelog.d/maintenance/antigravity-nonstream-test-realign.md
@@ -0,0 +1 @@
+- Realign the Antigravity non-streaming 429-retry test with the executor's actual contract: it returns the already-converted OpenAI `chat.completion` payload, so the test asserts that payload directly instead of re-parsing it as raw SSE (which returned `null` and failed the release-tip unit suite).
diff --git a/tests/unit/antigravity-streaming-passthrough.test.ts b/tests/unit/antigravity-streaming-passthrough.test.ts
index 23715cbae3..5aef685b7b 100644
--- a/tests/unit/antigravity-streaming-passthrough.test.ts
+++ b/tests/unit/antigravity-streaming-passthrough.test.ts
@@ -9,7 +9,6 @@ import {
   AntigravityExecutor,
   createCreditsExtractionTransform,
 } from "../../open-sse/executors/antigravity.ts";
-import { parseSSEToGeminiResponse } from "../../open-sse/handlers/sseParser/geminiResponse.ts";
 import {
   clearAntigravityVersionCache,
   seedAntigravityVersionCache,
@@ -73,11 +72,10 @@ test("AntigravityExecutor.execute auto-retries short 429 responses and collects
       credentials: { accessToken: "token", projectId: "project-1" },
       log: { debug() {}, warn() {} },
     });
-    // Non-streaming now returns raw SSE; parse it the way chatCore would.
-    const rawSSE = await result.response.text();
-    const parsed = parseSSEToGeminiResponse(rawSSE, "antigravity/gemini-2.5-flash");
-    assert.ok(parsed, "parseSSEToGeminiResponse should parse the SSE");
-    const payload = parsed as ChatCompletionPayload;
+    // Non-streaming collects the upstream SSE and returns the already-converted
+    // OpenAI chat.completion payload — no further SSE parsing on the caller side.
+    const payload = JSON.parse(await result.response.text()) as ChatCompletionPayload;
+    assert.equal(payload.object, "chat.completion");
 
     assert.equal(calls.length, 2);
     assert.equal(result.response.status, 200);