diff --git a/src/api_client.py b/src/api_client.py
index 78aa869..b6236df 100644
--- a/src/api_client.py
+++ b/src/api_client.py
@@ -64,7 +64,11 @@ class AnthropicAPIClient(APIClient):
     ENV_KEY = "ANTHROPIC_API_KEY"
 
     def get_headers(self):
-        return {"x-api-key": self.api_key, "anthropic-version": "2023-06-01"}
+        return {
+            "x-api-key": self.api_key,
+            "anthropic-version": "2023-06-01",
+            "anthropic-beta": "prompt-caching-2024-07-31",
+        }
 
     def prepare_body(self, messages, parameters):
         other_messages, system = self._transform_messages(messages)
@@ -75,9 +79,9 @@ def create_completion(self, response, pricing):
 
     def _transform_messages(self, original_messages):
         messages = [msg for msg in original_messages if msg["role"] != "system"]
-        system = [
-            {"type": "text", "text": msg["content"]}
-            for msg in original_messages
-            if msg["role"] == "system"
-        ]
+        system = []
+        for msg in original_messages:
+            if msg["role"] == "system":
+                system.extend(msg["content"])
+
         return messages, system
diff --git a/src/chat_completion.py b/src/chat_completion.py
index 68f19ea..33fb93d 100644
--- a/src/chat_completion.py
+++ b/src/chat_completion.py
@@ -24,6 +24,14 @@ def cost(self):
     def error_message(self):
         return self.response.get("error", {}).get("message", "")
 
+    @property
+    def cache_creation_input_tokens(self):
+        return 0
+
+    @property
+    def cache_read_input_tokens(self):
+        return 0
+
 
 class AnthropicChatCompletion(ChatCompletion):
     @property
@@ -42,6 +50,14 @@ def prompt_tokens(self):
     def completion_tokens(self):
         return self.response["usage"]["output_tokens"]
 
+    @property
+    def cache_creation_input_tokens(self):
+        return self.response["usage"]["cache_creation_input_tokens"]
+
+    @property
+    def cache_read_input_tokens(self):
+        return self.response["usage"]["cache_read_input_tokens"]
+
     @property
     def finish_reason(self):
         return self.response["stop_reason"]
diff --git a/src/lm_executors/chat_executor_template.yml b/src/lm_executors/chat_executor_template.yml
index 85c7a51..f441779 100644
--- a/src/lm_executors/chat_executor_template.yml
+++ b/src/lm_executors/chat_executor_template.yml
@@ -1,7 +1,18 @@
 ---
+{% for artifact in artifacts %}
 - role: system
-  content: |-
-    {{ chat_prompt | indent(4) }}
+  content:
+    - type: text
+      text: |-
+        {{ artifact | indent(8) }}
+      cache_control: 
+        type: ephemeral
+{% endfor %}
+- role: system
+  content:
+    - type: text
+      text: |-
+        {{ chat_prompt | indent(8) }}
 {% for message in messages %}
 {% if message.image_url %}
 - role: {{ message.role }}
@@ -20,7 +31,9 @@
 {% endif %}
 {% endfor %}
 {% if reinforcement_chat_prompt %}
-- role: {{ 'system' if not model.startswith('anthropic/') else 'assistant' }}
-  content: |-
-    {{ reinforcement_chat_prompt | indent(4) }}
+- role: {{ 'system' if not 'claude' in model else 'assistant' }}
+  content:
+    - type: text
+      text: |-
+        {{ reinforcement_chat_prompt | indent(8) }}
 {% endif %}
diff --git a/src/telegram/telegram_bot.py b/src/telegram/telegram_bot.py
index fc6cf3d..03b92fd 100644
--- a/src/telegram/telegram_bot.py
+++ b/src/telegram/telegram_bot.py
@@ -88,18 +88,26 @@ async def undo_command_handler(self, ctx):
 
     @message_handler
     async def stats_command_handler(self, ctx):
-        lines = []
-        lines.append("*Conversation*")
-        lines.append(f"`Cost: ${self.sim.get_conversation_cost():.2f}`")
-        lines.append("\n*Last Message*")
-        last_completion = self.sim.last_completion
-        if last_completion:
-            lines.append(f"`Cost: ${last_completion.cost:.2f}`")
-            lines.append(f"`Prompt tokens: {last_completion.prompt_tokens}`")
-            lines.append(f"`Completion tokens: {last_completion.completion_tokens}`")
+        conversation_cost = (
+            f"*Conversation*\n`Cost: ${self.sim.get_conversation_cost():.2f}`"
+        )
+
+        last_message_stats = "*Last Message*\n"
+        if self.sim.last_completion:
+            lc = self.sim.last_completion
+            last_message_stats += "\n".join(
+                [
+                    f"`Cost: ${lc.cost:.2f}`",
+                    f"`Prompt tokens: {lc.prompt_tokens}`",
+                    f"`Completion tokens: {lc.completion_tokens}`",
+                    f"`Cache creation tokens: {lc.cache_creation_input_tokens}`",
+                    f"`Cache read tokens: {lc.cache_read_input_tokens}`",
+                ]
+            )
         else:
-            lines.append("`Not available`")
-        await ctx.send_message("\n".join(lines))
+            last_message_stats += "`Not available`"
+
+        await ctx.send_message(f"{conversation_cost}\n\n{last_message_stats}")
 
     @message_handler
     async def clear_command_handler(self, ctx):