diff --git a/api/src/main/java/com/theokanning/openai/assistants/run/CreateThreadAndRunRequest.java b/api/src/main/java/com/theokanning/openai/assistants/run/CreateThreadAndRunRequest.java
index 883f111..1d8b267 100644
--- a/api/src/main/java/com/theokanning/openai/assistants/run/CreateThreadAndRunRequest.java
+++ b/api/src/main/java/com/theokanning/openai/assistants/run/CreateThreadAndRunRequest.java
@@ -95,6 +95,13 @@ public class CreateThreadAndRunRequest {
     @JsonProperty("tool_choice")
     ToolChoice toolChoice;
 
+    /**
+     * Whether to enable parallel function calling during tool use.
+     */
+    @JsonProperty("parallel_tool_calls")
+    Boolean parallelToolCalls;
+
+
     /**
      * Specifies the format that the model must output. Compatible with GPT-4 Turbo and all GPT-3.5 Turbo models since gpt-3.5-turbo-1106.
      * Setting to { "type": "json_object" } enables JSON mode, which guarantees the message the model generates is valid JSON.
diff --git a/api/src/main/java/com/theokanning/openai/completion/chat/ChatCompletionRequest.java b/api/src/main/java/com/theokanning/openai/completion/chat/ChatCompletionRequest.java
index 81318eb..31e002d 100644
--- a/api/src/main/java/com/theokanning/openai/completion/chat/ChatCompletionRequest.java
+++ b/api/src/main/java/com/theokanning/openai/completion/chat/ChatCompletionRequest.java
@@ -157,5 +157,12 @@ public class ChatCompletionRequest {
     @JsonProperty("tool_choice")
     ToolChoice toolChoice;
 
+    /**
+     * Whether to enable parallel function calling during tool use.
+     * {@see https://platform.openai.com/docs/guides/function-calling/parallel-function-calling}
+     */
+    @JsonProperty("parallel_tool_calls")
+    Boolean parallelToolCalls;
+
 
 }
diff --git a/api/src/test/resources/assistants/CreateThreadAndRunRequest.json b/api/src/test/resources/assistants/CreateThreadAndRunRequest.json
index 5b3abcb..10d40ce 100644
--- a/api/src/test/resources/assistants/CreateThreadAndRunRequest.json
+++ b/api/src/test/resources/assistants/CreateThreadAndRunRequest.json
@@ -36,5 +36,6 @@
       }
     }
   ],
-  "stream": true
+  "stream": true,
+  "parallel_tool_calls": true
 }
diff --git a/api/src/test/resources/fixtures/ChatCompletionRequest.json b/api/src/test/resources/fixtures/ChatCompletionRequest.json
index a8786e7..bfb2c84 100644
--- a/api/src/test/resources/fixtures/ChatCompletionRequest.json
+++ b/api/src/test/resources/fixtures/ChatCompletionRequest.json
@@ -105,5 +105,6 @@
   ],
   "stream_options": {
     "include_usage": true
-  }
+  },
+  "parallel_tool_calls": true
 }
diff --git a/service/src/test/java/com/theokanning/openai/service/ChatCompletionTest.java b/service/src/test/java/com/theokanning/openai/service/ChatCompletionTest.java
index 63f8054..11aaaa3 100644
--- a/service/src/test/java/com/theokanning/openai/service/ChatCompletionTest.java
+++ b/service/src/test/java/com/theokanning/openai/service/ChatCompletionTest.java
@@ -715,4 +715,42 @@ void streamChatMultipleToolCalls() {
     }
 
 
+    @Test
+    public void parallelToolCallTest() {
+        final List<ChatMessage> messages = new ArrayList<>();
+        final ChatMessage systemMessage = new SystemMessage("You are a helpful assistant.");
+        final ChatMessage userMessage = new UserMessage("What's the weather like in San Francisco, Tokyo, and Paris?");
+        messages.add(systemMessage);
+        messages.add(userMessage);
+
+        ChatCompletionRequest chatCompletionRequest = ChatCompletionRequest
+                .builder()
+                .model("gpt-3.5-turbo")
+                .messages(messages)
+                .tools(Arrays.asList(new ChatTool(ToolUtil.weatherFunction())))
+                .toolChoice(ToolChoice.AUTO)
+                .parallelToolCalls(false)
+                .n(1)
+                .maxTokens(200)
+                .build();
+
+        AssistantMessage accumulatedMessage = service.mapStreamToAccumulator(service.streamChatCompletion(chatCompletionRequest))
+                .blockingLast()
+                .getAccumulatedMessage();
+
+        List<ChatToolCall> toolCalls = accumulatedMessage.getToolCalls();
+        assertEquals(1, toolCalls.size());
+        assertEquals("get_weather", toolCalls.get(0).getFunction().getName());
+        assertInstanceOf(ObjectNode.class, toolCalls.get(0).getFunction().getArguments());
+
+
+        chatCompletionRequest.setParallelToolCalls(true);
+        AssistantMessage accumulatedMessage2 = service.mapStreamToAccumulator(service.streamChatCompletion(chatCompletionRequest))
+                .blockingLast()
+                .getAccumulatedMessage();
+        List<ChatToolCall> toolCalls2 = accumulatedMessage2.getToolCalls();
+        assertEquals(3, toolCalls2.size());
+        assertEquals("get_weather", toolCalls2.get(0).getFunction().getName());
+    }
+
 }