diff --git a/backend/internal/service/openai_gateway_grok.go b/backend/internal/service/openai_gateway_grok.go
index 19e44fc4d9..2d29bfaabf 100644
--- a/backend/internal/service/openai_gateway_grok.go
+++ b/backend/internal/service/openai_gateway_grok.go
@@ -122,13 +122,14 @@ func (s *OpenAIGatewayService) forwardGrokResponses(
 	if usage == nil {
 		usage = &OpenAIUsage{}
 	}
+	reasoningEffort := extractOpenAIReasoningEffortFromBody(patchedBody, originalModel)
 	return &OpenAIForwardResult{
 		RequestID:       firstNonEmpty(resp.Header.Get("x-request-id"), resp.Header.Get("xai-request-id")),
 		ResponseID:      responseID,
 		Usage:           *usage,
 		Model:           originalModel,
 		UpstreamModel:   upstreamModel,
-		ReasoningEffort: ptrStringOrNil(normalizeOpenAIReasoningEffort(gjson.GetBytes(patchedBody, "reasoning.effort").String())),
+		ReasoningEffort: reasoningEffort,
 		Stream:          reqStream,
 		OpenAIWSMode:    false,
 		ResponseHeaders: resp.Header.Clone(),
diff --git a/backend/internal/service/openai_gateway_grok_test.go b/backend/internal/service/openai_gateway_grok_test.go
index 80135033da..8dbd9ddad0 100644
--- a/backend/internal/service/openai_gateway_grok_test.go
+++ b/backend/internal/service/openai_gateway_grok_test.go
@@ -41,6 +41,17 @@ func TestPatchGrokResponsesBodySetsMappedModelAndDropsUnsupportedFields(t *testi
 	require.Equal(t, "high", gjson.GetBytes(patched, "reasoning.effort").String())
 }
 
+func TestExtractGrokResponsesReasoningEffortSupportsOpenAICompatibleField(t *testing.T) {
+	t.Parallel()
+
+	effort := extractOpenAIReasoningEffortFromBody(
+		[]byte(`{"model":"grok-4.3","reasoning_effort":"high"}`),
+		"grok-4.3",
+	)
+	require.NotNil(t, effort)
+	require.Equal(t, "high", *effort)
+}
+
 func TestPatchGrokResponsesBodyDropsGrok45ReasoningUnsupportedFields(t *testing.T) {
 	t.Parallel()
 
@@ -656,7 +667,7 @@ func TestForwardGrokResponsesStreamingUsesXAIResponsesAndSnapshots(t *testing.T)
 
 	recorder := httptest.NewRecorder()
 	c, _ := gin.CreateTestContext(recorder)
-	body := []byte(`{"model":"grok","input":"hi","stream":true}`)
+	body := []byte(`{"model":"grok","input":"hi","stream":true,"reasoning_effort":"high"}`)
 	c.Request = httptest.NewRequest(http.MethodPost, "/v1/responses", bytes.NewReader(body))
 	c.Request.Header.Set("Content-Type", "application/json")
 	c.Request.Header.Set("OpenAI-Beta", "responses=experimental")
@@ -708,6 +719,7 @@ func TestForwardGrokResponsesStreamingUsesXAIResponsesAndSnapshots(t *testing.T)
 	require.Equal(t, "Bearer access-token", upstream.lastReq.Header.Get("Authorization"))
 	require.Equal(t, "responses=experimental", upstream.lastReq.Header.Get("OpenAI-Beta"))
 	require.Equal(t, "grok-4.5", gjson.GetBytes(upstream.lastBody, "model").String())
+	require.Equal(t, "high", gjson.GetBytes(upstream.lastBody, "reasoning_effort").String())
 	require.True(t, gjson.GetBytes(upstream.lastBody, "stream").Bool())
 	require.True(t, result.Stream)
 	require.Equal(t, "resp_grok", result.ResponseID)
@@ -715,6 +727,8 @@ func TestForwardGrokResponsesStreamingUsesXAIResponsesAndSnapshots(t *testing.T)
 	require.Equal(t, 5, result.Usage.InputTokens)
 	require.Equal(t, 3, result.Usage.OutputTokens)
 	require.Equal(t, 2, result.Usage.CacheReadInputTokens)
+	require.NotNil(t, result.ReasoningEffort)
+	require.Equal(t, "high", *result.ReasoningEffort)
 	require.Contains(t, recorder.Header().Get("Content-Type"), "text/event-stream")
 	require.Contains(t, recorder.Body.String(), "response.output_text.delta")
 	require.NotNil(t, repo.updates[52][grokQuotaSnapshotExtraKey])