diff --git a/backend/llm.py b/backend/llm.py
index b4a35e9a8..3a1b7c384 100644
--- a/backend/llm.py
+++ b/backend/llm.py
@@ -18,7 +18,7 @@ class Llm(Enum):
     CLAUDE_3_5_SONNET_2024_06_20 = "claude-3-5-sonnet-20240620"
     CLAUDE_3_5_SONNET_2024_10_22 = "claude-3-5-sonnet-20241022"
     CLAUDE_3_7_SONNET_2025_02_19 = "claude-3-7-sonnet-20250219"
-    CLAUDE_4_SONNET_2025_05_14 = "claude-sonnet-4-20250514"
+    CLAUDE_4_5_SONNET_2025_09_29 = "claude-sonnet-4-5-20250929"
     CLAUDE_4_OPUS_2025_05_14 = "claude-opus-4-20250514"
     GEMINI_2_0_FLASH_EXP = "gemini-2.0-flash-exp"
     GEMINI_2_0_FLASH = "gemini-2.0-flash"
@@ -57,7 +57,7 @@ class Completion(TypedDict):
     Llm.CLAUDE_3_5_SONNET_2024_06_20: "anthropic",
     Llm.CLAUDE_3_5_SONNET_2024_10_22: "anthropic",
     Llm.CLAUDE_3_7_SONNET_2025_02_19: "anthropic",
-    Llm.CLAUDE_4_SONNET_2025_05_14: "anthropic",
+    Llm.CLAUDE_4_5_SONNET_2025_09_29: "anthropic",
     Llm.CLAUDE_4_OPUS_2025_05_14: "anthropic",
     # Gemini models
     Llm.GEMINI_2_0_FLASH_EXP: "gemini",
diff --git a/backend/models/claude.py b/backend/models/claude.py
index 6b087a0c5..3732508c9 100644
--- a/backend/models/claude.py
+++ b/backend/models/claude.py
@@ -81,7 +81,7 @@ async def stream_claude_response(
     response = ""
 
     if (
-        model_name == Llm.CLAUDE_4_SONNET_2025_05_14.value
+        model_name == Llm.CLAUDE_4_5_SONNET_2025_09_29.value
         or model_name == Llm.CLAUDE_4_OPUS_2025_05_14.value
     ):
         print(f"Using {model_name} with thinking")
diff --git a/backend/routes/generate_code.py b/backend/routes/generate_code.py
index 146c059e0..4a7b8437e 100644
--- a/backend/routes/generate_code.py
+++ b/backend/routes/generate_code.py
@@ -359,13 +359,12 @@ def _get_variant_models(
         gemini_api_key: str | None,
     ) -> List[Llm]:
         """Simple model cycling that scales with num_variants"""
+        claude_model = Llm.CLAUDE_4_5_SONNET_2025_09_29
 
-        claude_model = Llm.CLAUDE_3_7_SONNET_2025_02_19
-
-        # For text input mode, use Claude 4 Sonnet as third option
+        # For text input mode, use Claude 3.7 Sonnet as third option
         # For other input modes (image/video), use Gemini as third option
         if input_mode == "text":
-            third_model = Llm.CLAUDE_4_SONNET_2025_05_14
+            third_model = Llm.CLAUDE_3_7_SONNET_2025_02_19
         else:
             # Gemini only works for create right now
             if generation_type == "create":
@@ -617,12 +616,11 @@ def _create_generation_tasks(
                 if self.anthropic_api_key is None:
                     raise Exception("Anthropic API key is missing.")
 
-                # For creation, use Claude Sonnet 3.7
-                # For updates, we use Claude Sonnet 3.5 until we have tested Claude Sonnet 3.7
+                # Use Sonnet 4.5 for both create and update tasks
                 if params["generationType"] == "create":
-                    claude_model = Llm.CLAUDE_3_7_SONNET_2025_02_19
+                    claude_model = Llm.CLAUDE_4_5_SONNET_2025_09_29
                 else:
-                    claude_model = Llm.CLAUDE_3_5_SONNET_2024_06_20
+                    claude_model = Llm.CLAUDE_4_5_SONNET_2025_09_29
 
                 tasks.append(
                     stream_claude_response(
@@ -956,4 +954,4 @@ async def stream_code(websocket: WebSocket):
     pipeline.use(PostProcessingMiddleware())
 
     # Execute the pipeline
-    await pipeline.execute(websocket)
+    await pipeline.execute(websocket)
\ No newline at end of file