diff --git a/.env.development b/.env.development
index 6b3844f8..a9af3611 100644
--- a/.env.development
+++ b/.env.development
@@ -37,4 +37,8 @@ NEXT_PUBLIC_ENABLE_LOGGING=true
 
 #Gemini API Key
 GEMINI_API_KEY="AIzaSyDDmMkTkNt12QTj7I3SUygYkOoeG_Sc28Q"
-GEMINI_MODEL="gemini-3.1-pro-preview"
\ No newline at end of file
+GEMINI_MODEL="gemini-3.1-pro-preview"
+# [openrouter 스캐폴드] PDF 도면 판독 provider 토글 — 기본 gemini(값 채우기 전까지 동작 불변)
+PDF_ANALYZER_PROVIDER=openrouter
+OPENROUTER_API_KEY=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
+OPENROUTER_MODEL=anthropic/claude-sonnet-5
diff --git a/.env.local.dev b/.env.local.dev
index a53524ca..bce504fe 100644
--- a/.env.local.dev
+++ b/.env.local.dev
@@ -33,4 +33,8 @@ S3_PROFILE="dev"
 
 #Gemini API Key
 GEMINI_API_KEY="AIzaSyDDmMkTkNt12QTj7I3SUygYkOoeG_Sc28Q"
-GEMINI_MODEL="gemini-3.1-pro-preview"
\ No newline at end of file
+GEMINI_MODEL="gemini-3.1-pro-preview"
+# [openrouter 스캐폴드] PDF 도면 판독 provider 토글 — 기본 gemini(값 채우기 전까지 동작 불변)
+PDF_ANALYZER_PROVIDER=openrouter
+OPENROUTER_API_KEY=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
+OPENROUTER_MODEL=anthropic/claude-sonnet-5
diff --git a/.env.localhost b/.env.localhost
index 7cab2757..811d8730 100644
--- a/.env.localhost
+++ b/.env.localhost
@@ -39,3 +39,8 @@ NEXT_PUBLIC_ENABLE_LOGGING=true
 #Gemini API Key
 GEMINI_API_KEY="AIzaSyDDmMkTkNt12QTj7I3SUygYkOoeG_Sc28Q"
 GEMINI_MODEL="gemini-3.1-pro-preview"
+
+# [openrouter 스캐폴드] PDF 도면 판독 provider 토글 — 기본 gemini(값 채우기 전까지 동작 불변)
+PDF_ANALYZER_PROVIDER=openrouter
+OPENROUTER_API_KEY=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
+OPENROUTER_MODEL=anthropic/claude-sonnet-5
diff --git a/.env.production b/.env.production
index 50904369..c1d342c3 100644
--- a/.env.production
+++ b/.env.production
@@ -36,4 +36,8 @@ NEXT_PUBLIC_ENABLE_LOGGING=false
 
 #Gemini API Key
 GEMINI_API_KEY="AIzaSyDDmMkTkNt12QTj7I3SUygYkOoeG_Sc28Q"
-GEMINI_MODEL="gemini-3.1-pro-preview"
\ No newline at end of file
+GEMINI_MODEL="gemini-3.1-pro-preview"
+# [openrouter 스캐폴드] PDF 도면 판독 provider 토글 — 기본 gemini(값 채우기 전까지 동작 불변)
+PDF_ANALYZER_PROVIDER=openrouter
+OPENROUTER_API_KEY=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
+OPENROUTER_MODEL=anthropic/claude-sonnet-5
diff --git a/package.json b/package.json
index 81c5c75b..75a28fc1 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,7 @@
     "mssql": "^11.0.1",
     "next": "14.2.28",
     "next-international": "^1.2.4",
+    "openai": "^6.45.0",
     "pdf-lib": "^1.17.1",
     "react": "^18",
     "react-chartjs-2": "^5.2.0",