diff --git a/ai/litellm-config.yaml b/ai/litellm-config.yaml
index d4a247a..1e34f15 100644
--- a/ai/litellm-config.yaml
+++ b/ai/litellm-config.yaml
@@ -2,27 +2,27 @@ model_list:
   - model_name: claude-sonnet-4
     litellm_params:
       model: anthropic/claude-sonnet-4-20250514
-      api_key: ${ANTHROPIC_API_KEY}
+      api_key: os.environ/ANTHROPIC_API_KEY
 
   - model_name: claude-sonnet-4.5
     litellm_params:
       model: anthropic/claude-sonnet-4-5-20250929
-      api_key: ${ANTHROPIC_API_KEY}
+      api_key: os.environ/ANTHROPIC_API_KEY
 
   - model_name: claude-3-5-sonnet
     litellm_params:
       model: anthropic/claude-3-5-sonnet-20241022
-      api_key: ${ANTHROPIC_API_KEY}
+      api_key: os.environ/ANTHROPIC_API_KEY
 
   - model_name: claude-3-opus
     litellm_params:
       model: anthropic/claude-3-opus-20240229
-      api_key: ${ANTHROPIC_API_KEY}
+      api_key: os.environ/ANTHROPIC_API_KEY
 
   - model_name: claude-3-haiku
     litellm_params:
       model: anthropic/claude-3-haiku-20240307
-      api_key: ${ANTHROPIC_API_KEY}
+      api_key: os.environ/ANTHROPIC_API_KEY
 
 litellm_settings:
   drop_params: true