diff --git a/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/ocr-sidecar/app.py b/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/ocr-sidecar/app.py
index 2238a17f..5eb62be9 100644
--- a/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/ocr-sidecar/app.py
+++ b/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/ocr-sidecar/app.py
@@ -238,7 +238,7 @@ def process_with_typhoon_ocr(pil_image: Image.Image, options_override: dict = {}
         "top_p": 0.1,
         "repeat_penalty": 1.1,
         "num_gpu": 99,  # บังคับ GPU layers สูงสุด — ป้องกัน Ollama fallback ไป CPU โดยไม่จำเป็น
-        "num_ctx": 2048,  # ลด KV cache + compute graph จาก 6.7 GiB → ~1.7 GiB เพื่อให้ model fit ใน VRAM 8GB
+        "num_ctx": 4096,  # image tokens ~2772 → ต้องการ context > 2048; 4096 รองรับ image + output โดยไม่ truncate
         **options_override,
     }
     payload = {
diff --git a/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/typhoon-np-dms-ocr.model.md b/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/typhoon-np-dms-ocr.model.md
index 7fbaee81..a82b6364 100644
--- a/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/typhoon-np-dms-ocr.model.md
+++ b/specs/04-Infrastructure-OPS/04-00-docker-compose/Desk-5439/typhoon-np-dms-ocr.model.md
@@ -1,6 +1,6 @@
 FROM scb10x/typhoon-ocr1.5-3b:latest
 
-PARAMETER num_ctx 2048
+PARAMETER num_ctx 4096
 PARAMETER num_predict 2048
 PARAMETER temperature 0.1
 PARAMETER top_p 0.1