diff --git a/tests/core/test_block_manager.py b/tests/core/test_block_manager.py
index 88cd4f98091f..ebab99bf2906 100644
--- a/tests/core/test_block_manager.py
+++ b/tests/core/test_block_manager.py
@@ -136,7 +136,6 @@ def test_append_slot_cow():
                       inputs={
                           "prompt": "one two three",
                           "prompt_token_ids": [1, 2, 3],
-                          "multi_modal_data": None
                       },
                       block_size=block_size)
 
@@ -311,7 +310,6 @@ def test_sliding_window_multi_seq():
                       inputs={
                           "prompt": "one two three",
                           "prompt_token_ids": [0, 1, 2],
-                          "multi_modal_data": None
                       },
                       block_size=block_size)
     seq_group = SequenceGroup(request_id="1",
diff --git a/tests/core/utils.py b/tests/core/utils.py
index 1c5724090b69..b7b93542ad7a 100644
--- a/tests/core/utils.py
+++ b/tests/core/utils.py
@@ -25,7 +25,6 @@ def create_dummy_prompt(
                       inputs={
                           "prompt": prompt_str,
                           "prompt_token_ids": prompt_tokens,
-                          "multi_modal_data": None,
                       },
                       block_size=block_size)
     seq_group = SequenceGroup(request_id=request_id,
@@ -57,11 +56,7 @@ def create_seq_group(
     for seq_id_offset, output_len in enumerate(seq_output_lens):
         seq = Sequence(
             seq_id=seq_id_start + seq_id_offset,
-            inputs={
-                "prompt": "",
-                "prompt_token_ids": prompt_token_ids,
-                "multi_modal_data": None,
-            },
+            inputs={"prompt_token_ids": prompt_token_ids},
             block_size=16,
         )
 
diff --git a/tests/engine/output_processor/test_stop_checker.py b/tests/engine/output_processor/test_stop_checker.py
index 1d9c878ddde5..f795403e3d8a 100644
--- a/tests/engine/output_processor/test_stop_checker.py
+++ b/tests/engine/output_processor/test_stop_checker.py
@@ -15,11 +15,7 @@ def sequence_with_eos(text: str, eos_token: str,
     """
     seq = Sequence(
         seq_id=0,
-        inputs={
-            "prompt": "",
-            "prompt_token_ids": [],
-            "multi_modal_data": None,
-        },
+        inputs={"prompt_token_ids": []},
         block_size=16,
         eos_token_id=eos_token_id,
     )
diff --git a/tests/test_cache_block_hashing.py b/tests/test_cache_block_hashing.py
index 97864af88e40..0fbe3dae1ff0 100644
--- a/tests/test_cache_block_hashing.py
+++ b/tests/test_cache_block_hashing.py
@@ -74,7 +74,6 @@ def test_auto_prefix_caching(model: str, block_size: int, max_num_seqs: int,
                                inputs={
                                    "prompt": prompt,
                                    "prompt_token_ids": prompt_token_ids,
-                                   "multi_modal_data": None,
                                },
                                block_size=block_size,
                                eos_token_id=tokenizer.tokenizer.eos_token_id,
diff --git a/tests/tokenization/test_detokenize.py b/tests/tokenization/test_detokenize.py
index 1d4c74d6bd8d..8d019fe5f38c 100644
--- a/tests/tokenization/test_detokenize.py
+++ b/tests/tokenization/test_detokenize.py
@@ -126,7 +126,6 @@ def create_sequence(prompt_token_ids=None):
         inputs={
             "prompt": "<s>",
             "prompt_token_ids": prompt_token_ids,
-            "multi_modal_data": None,
         },
         block_size=16,
     )
diff --git a/vllm/inputs.py b/vllm/inputs.py
index f5d99b1b66b7..85c9cd84f5ed 100644
--- a/vllm/inputs.py
+++ b/vllm/inputs.py
@@ -126,5 +126,5 @@ class TextTokensPrompt(TypedDict):
 
 class LLMInputs(TypedDict):
     prompt_token_ids: List[int]
-    prompt: Optional[str]
-    multi_modal_data: Optional["MultiModalData"]
+    prompt: NotRequired[Optional[str]]
+    multi_modal_data: NotRequired[Optional["MultiModalData"]]
diff --git a/vllm/sequence.py b/vllm/sequence.py
index f8e9da6c7965..d9a9dea9a056 100644
--- a/vllm/sequence.py
+++ b/vllm/sequence.py
@@ -249,7 +249,7 @@ def __init__(
 
     @property
     def prompt(self) -> Optional[str]:
-        return self.inputs["prompt"]
+        return self.inputs.get("prompt")
 
     @property
     def prompt_token_ids(self) -> List[int]:
@@ -257,7 +257,7 @@ def prompt_token_ids(self) -> List[int]:
 
     @property
     def multi_modal_data(self) -> Optional["MultiModalData"]:
-        return self.inputs["multi_modal_data"]
+        return self.inputs.get("multi_modal_data")
 
     @property
     def lora_int_id(self) -> int: