GLM-OCR repeats OCR output unless a stop sequence is configured and for some images if configured then also repeats the OCR

Environment

• Ollama
• Model: glm-ocr
• Endpoint: /api/chat
• CPU-only inference (WSL/Windows)

Issue

I am using GLM-OCR through Ollama for OCR extraction.

For the attached image, the model correctly extracts the text but then continues repeating the same output multiple times instead of stopping.

The same image and prompt work correctly with qwen3.5:9b, which returns the OCR text only once without repetition.

Question 1

Is this repetition expected behavior for GLM-OCR?

Even with the following prompt:

Extract ONLY the exact visible text from this image.

Rules:

• Do not explain the image
• Do not summarize
• Do not describe background
• Do not infer meaning
• Do not add extra words
• Return only exact visible text

the model continues generating repeated content.

Question 2

I noticed that configuring:

"options": { "stop": ["```"] }

Is passing a stop sequence required/recommended when using GLM-OCR through Ollama?

Without the stop sequence, the model repeatedly outputs the same OCR result.

With qwen3.5:9b, I do not need any stop sequence and the model terminates correctly.

Reproduction Code

import base64
import time
import requests

OLLAMA_URL = "http://localhost:11434/api/chat"
MODEL = "glm-ocr"

PROMPT = """
Extract ONLY the exact visible text from this image.

Rules:
- Do not explain the image
- Do not summarize
- Do not describe background
- Do not infer meaning
- Do not add extra words
- Return only exact visible text
"""

def encode_image(image_path):
    with open(image_path, "rb") as f:
        return base64.b64encode(f.read()).decode("utf-8")

def ocr_image(image_path):
    image_b64 = encode_image(image_path)

    payload = {
        "model": MODEL,
        "messages": [
            {
                "role": "user",
                "content": PROMPT,
                "images": [image_b64],
            }
        ],
        "stream": False,
        "options": {
            "stop": ["```"]
        }
    }

    start = time.time()

    resp = requests.post(
        OLLAMA_URL,
        json=payload,
        timeout=500
    )

    elapsed = round(time.time() - start, 2)

    resp.raise_for_status()

    data = resp.json()

    print(f"Inference time: {elapsed}s")
    print(data["message"]["content"].strip())

if __name__ == "__main__":
    ocr_image("./data/input/test_1.jpg")

Output: (venv) puneet@IN-PG052KWG:~/edge-ai/edge-vision-component$ python test2.py Inference time: 417.04s

----- OCR TEXT ----- YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU DIDN'T COME THIS FAR TO ONLY COME THIS FAR YOU 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