diff --git a/model/renderers/glmocr.go b/model/renderers/glmocr.go
index e7910f6a5..2888750ac 100644
--- a/model/renderers/glmocr.go
+++ b/model/renderers/glmocr.go
@@ -46,12 +46,11 @@ func (r *GlmOcrRenderer) Render(messages []api.Message, tools []api.Tool, thinkV
 		sb.WriteString("<tool_call>{function-name}<arg_key>{arg-key-1}</arg_key><arg_value>{arg-value-1}</arg_value><arg_key>{arg-key-2}</arg_key><arg_value>{arg-value-2}</arg_value>...</tool_call>")
 	}
 
-	enableThinking := false
-	thinkingExplicitlySet := false
-	if thinkValue != nil {
-		enableThinking = thinkValue.Bool()
-		thinkingExplicitlySet = true
-	}
+	// thinkValue is accepted for renderer interface parity. Do not inject
+	// /nothink or an empty generation <think></think> when thinking is off —
+	// ResolveThinking fills Default:false on omission, and those markers
+	// derail glm-ocr table recognition (#18810).
+	_ = thinkValue
 
 	imageOffset := 0
 	for i, message := range messages {
@@ -61,9 +60,6 @@ func (r *GlmOcrRenderer) Render(messages []api.Message, tools []api.Tool, thinkV
 			content, nextOffset := r.renderContent(message, imageOffset)
 			imageOffset = nextOffset
 			sb.WriteString(content)
-			if thinkingExplicitlySet && !enableThinking && !strings.HasSuffix(message.Content, "/nothink") {
-				sb.WriteString("/nothink")
-			}
 		case "assistant":
 			sb.WriteString("<|assistant|>\n")
 			if message.Thinking != "" {
@@ -99,9 +95,6 @@ func (r *GlmOcrRenderer) Render(messages []api.Message, tools []api.Tool, thinkV
 	}
 
 	sb.WriteString("<|assistant|>\n")
-	if thinkingExplicitlySet && !enableThinking {
-		sb.WriteString("<think></think>\n")
-	}
 
 	return sb.String(), nil
 }
diff --git a/model/renderers/glmocr_test.go b/model/renderers/glmocr_test.go
index 1f8b9c038..ab87eb2b7 100644
--- a/model/renderers/glmocr_test.go
+++ b/model/renderers/glmocr_test.go
@@ -1,6 +1,7 @@
 package renderers
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -97,3 +98,45 @@ func TestGlmOcrRenderer_Images(t *testing.T) {
 		})
 	}
 }
+
+// ResolveThinking fills Default:false when the client omits think. That must not
+// inject /nothink or an empty generation <think></think> — those markers derail
+// glm-ocr table recognition (see #18810).
+func TestGlmOcrRenderer_NoNothinkWhenThinkingOff(t *testing.T) {
+	messages := []api.Message{
+		{
+			Role:    "user",
+			Content: "Table Recognition:",
+			Images:  []api.ImageData{api.ImageData("img1")},
+		},
+	}
+	want := "[gMASK]<sop><|user|>\n[img-0] Table Recognition:<|assistant|>\n"
+
+	tests := []struct {
+		name  string
+		think *api.ThinkValue
+	}{
+		{name: "think_omitted", think: nil},
+		{name: "think_false", think: &api.ThinkValue{Value: false}},
+		{name: "think_true", think: &api.ThinkValue{Value: true}},
+	}
+
+	renderer := &GlmOcrRenderer{useImgTags: true}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := renderer.Render(messages, nil, tt.think)
+			if err != nil {
+				t.Fatalf("Render() error = %v", err)
+			}
+			if diff := cmp.Diff(want, got); diff != "" {
+				t.Fatalf("Render() mismatch (-want +got):\n%s", diff)
+			}
+			if strings.Contains(got, "/nothink") {
+				t.Fatalf("prompt unexpectedly contains /nothink: %q", got)
+			}
+			if strings.HasSuffix(got, "<think></think>\n") {
+				t.Fatalf("prompt unexpectedly ends with empty think block: %q", got)
+			}
+		})
+	}
+}