diff --git a/llm_claude_3.py b/llm_claude_3.py
index 40ba992..1b132ae 100644
--- a/llm_claude_3.py
+++ b/llm_claude_3.py
@@ -10,7 +10,17 @@ def register_models(register):
     register(ClaudeMessages("claude-3-opus-20240229"), aliases=("claude-3-opus",))
     register(ClaudeMessages("claude-3-sonnet-20240229"), aliases=("claude-3-sonnet",))
     register(ClaudeMessages("claude-3-haiku-20240307"), aliases=("claude-3-haiku",))
-    register(ClaudeMessages("claude-3-5-sonnet-20240620"), aliases=("claude-3.5-sonnet",))
+    register(
+        ClaudeMessages("claude-3-5-sonnet-20240620"), aliases=("claude-3.5-sonnet",)
+    )
+    register(
+        ClaudeMessages(
+            "claude-3-5-sonnet-20240620-long",
+            claude_model_id="claude-3-5-sonnet-20240620",
+            extra_headers={"anthropic-beta": "max-tokens-3-5-sonnet-2024-07-15"},
+        ),
+        aliases=("claude-3.5-sonnet-long",),
+    )
 
 
 class ClaudeOptions(llm.Options):
@@ -81,8 +91,10 @@ class ClaudeMessages(llm.Model):
 
     class Options(ClaudeOptions): ...
 
-    def __init__(self, model_id):
+    def __init__(self, model_id, claude_model_id=None, extra_headers=None):
         self.model_id = model_id
+        self.claude_model_id = claude_model_id or model_id
+        self.extra_headers = extra_headers
 
     def build_messages(self, prompt, conversation) -> List[dict]:
         messages = []
@@ -104,7 +116,7 @@ def execute(self, prompt, stream, response, conversation):
         client = Anthropic(api_key=self.get_key())
 
         kwargs = {
-            "model": self.model_id,
+            "model": self.claude_model_id,
             "messages": self.build_messages(prompt, conversation),
             "max_tokens": prompt.options.max_tokens,
         }
@@ -122,7 +134,9 @@ def execute(self, prompt, stream, response, conversation):
         if prompt.system:
             kwargs["system"] = prompt.system
 
-        usage = None
+        if self.extra_headers:
+            kwargs["extra_headers"] = self.extra_headers
+
         if stream:
             with client.messages.stream(**kwargs) as stream:
                 for text in stream.text_stream: