diff --git a/ai/compose.yaml b/ai/compose.yaml
index e100c7e..fa5c39b 100644
--- a/ai/compose.yaml
+++ b/ai/compose.yaml
@@ -33,9 +33,9 @@ services:
       # Database configuration
       DATABASE_URL: postgresql://${AI_DB_USER}:${AI_DB_PASSWORD}@ai_postgres:5432/${AI_DB_NAME}
 
-      # OpenAI API configuration (for Claude via Anthropic API)
-      OPENAI_API_BASE_URLS: ${AI_OPENAI_API_BASE_URLS:-https://api.anthropic.com/v1}
-      OPENAI_API_KEYS: ${ANTHROPIC_API_KEY}
+      # OpenAI API configuration (pointing to LiteLLM proxy)
+      OPENAI_API_BASE_URLS: http://litellm:4000/v1
+      OPENAI_API_KEYS: sk-1234  # Dummy key for LiteLLM proxy
 
       # WebUI configuration
       WEBUI_NAME: ${AI_WEBUI_NAME:-Pivoine AI}
@@ -65,6 +65,7 @@ services:
       - ai_webui_data:/app/backend/data
     depends_on:
       - ai_postgres
+      - litellm
     networks:
       - compose_network
     labels:
@@ -86,6 +87,32 @@ services:
       # Watchtower
       - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
 
+  # LiteLLM - Proxy to convert Anthropic API to OpenAI-compatible format
+  litellm:
+    image: ghcr.io/berriai/litellm:main-latest
+    container_name: ${AI_COMPOSE_PROJECT_NAME}_litellm
+    restart: unless-stopped
+    environment:
+      TZ: ${TIMEZONE:-Europe/Berlin}
+      ANTHROPIC_API_KEY: ${ANTHROPIC_API_KEY}
+      LITELLM_MASTER_KEY: ${AI_WEBUI_SECRET_KEY}
+    volumes:
+      - ./ai/litellm-config.yaml:/app/config.yaml:ro
+    command: ["--config", "/app/config.yaml", "--port", "4000", "--num_workers", "1"]
+    networks:
+      - compose_network
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:4000/health || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 20s
+    labels:
+      # No Traefik exposure - internal only
+      - 'traefik.enable=false'
+      # Watchtower
+      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+
   # Crawl4AI - Web scraping for LLMs (internal API, no public access)
   crawl4ai:
     image: ${AI_CRAWL4AI_IMAGE:-unclecode/crawl4ai:latest}
diff --git a/ai/litellm-config.yaml b/ai/litellm-config.yaml
new file mode 100644
index 0000000..3c9576e
--- /dev/null
+++ b/ai/litellm-config.yaml
@@ -0,0 +1,29 @@
+model_list:
+  - model_name: claude-sonnet-4
+    litellm_params:
+      model: anthropic/claude-sonnet-4-20250514
+      api_key: ${ANTHROPIC_API_KEY}
+
+  - model_name: claude-sonnet-4.5
+    litellm_params:
+      model: anthropic/claude-sonnet-4-5-20250929
+      api_key: ${ANTHROPIC_API_KEY}
+
+  - model_name: claude-3-5-sonnet
+    litellm_params:
+      model: anthropic/claude-3-5-sonnet-20241022
+      api_key: ${ANTHROPIC_API_KEY}
+
+  - model_name: claude-3-opus
+    litellm_params:
+      model: anthropic/claude-3-opus-20240229
+      api_key: ${ANTHROPIC_API_KEY}
+
+  - model_name: claude-3-haiku
+    litellm_params:
+      model: anthropic/claude-3-haiku-20240307
+      api_key: ${ANTHROPIC_API_KEY}
+
+litellm_settings:
+  drop_params: true
+  set_verbose: false