diff --git a/src/autoplex/auto/rss/jobs.py b/src/autoplex/auto/rss/jobs.py
index 60ed679f5..6bc224eb0 100644
--- a/src/autoplex/auto/rss/jobs.py
+++ b/src/autoplex/auto/rss/jobs.py
@@ -1,6 +1,7 @@
 """RSS Jobs include the generation of the initial potential model as well as iterative RSS exploration."""
 
 import logging
+from typing import Literal
 
 from jobflow import Flow, Response, job
 
@@ -54,7 +55,7 @@ def initial_rss(
     force_max: float | None = None,
     force_label: str = "REF_forces",
     pre_database_dir: str | None = None,
-    mlip_type: str = "GAP",
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"] = "GAP",
     ref_energy_name: str = "REF_energy",
     ref_force_name: str = "REF_forces",
     ref_virial_name: str = "REF_virial",
@@ -137,9 +138,8 @@ def initial_rss(
         The label of force values to use for distillation. Default is 'REF_forces'.
     pre_database_dir: str | None
         Directory where the previous database was saved. Default is None.
-    mlip_type: str
-        Choose one specific MLIP type to be fitted: 'GAP' | 'J-ACE' | 'NEQUIP' | 'M3GNET' | 'MACE'.
-        Default is 'GAP'.
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted. Default is 'GAP'.
     ref_energy_name: str
         Reference energy name. Default is 'REF_energy'.
     ref_force_name: str
@@ -286,7 +286,7 @@ def do_rss_iterations(
     distillation: bool = True,
     force_max: float = 200,
     force_label: str = "REF_forces",
-    mlip_type: str = "GAP",
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"] = "GAP",
     ref_energy_name: str = "REF_energy",
     ref_force_name: str = "REF_forces",
     ref_virial_name: str = "REF_virial",
@@ -409,8 +409,8 @@ def do_rss_iterations(
         Maximum force value to exclude structures. Default is 200.
     force_label: str
         The label of force values to use for distillation. Default is 'REF_forces'.
-    mlip_type: str
-        Choose one specific MLIP type: 'GAP' | 'J-ACE' | 'NequIP' | 'M3GNet' | 'MACE'. Default is 'GAP'.
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted. Default is 'GAP'.
     ref_energy_name: str
         Reference energy name. Default is 'REF_energy'.
     ref_force_name: str
diff --git a/src/autoplex/data/rss/jobs.py b/src/autoplex/data/rss/jobs.py
index b4a1e853c..42ec3468a 100644
--- a/src/autoplex/data/rss/jobs.py
+++ b/src/autoplex/data/rss/jobs.py
@@ -7,6 +7,7 @@
 from pathlib import Path
 from shutil import which
 from subprocess import run
+from typing import Literal
 
 import ase.io
 import numpy as np
@@ -413,7 +414,7 @@ def _parallel_process(
 
 @job
 def do_rss_single_node(
-    mlip_type: str,
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"],
     mlip_path: str,
     iteration_index: str,
     structures: list[Structure],
@@ -441,9 +442,8 @@ def do_rss_single_node(
 
     Parameters
     ----------
-    mlip_type: str
-        Choose one specific MLIP type:
-        'GAP' | 'J-ACE' | 'NequIP' | 'M3GNet' | 'MACE'.
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted.
     mlip_path: str
         Path to the MLIP model.
     iteration_index: str
@@ -521,7 +521,7 @@ def do_rss_single_node(
 
 @job
 def do_rss_multi_node(
-    mlip_type: str,
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"],
     mlip_path: str,
     iteration_index: str,
     structure: list[Structure] | list[list[Structure]] | None = None,
@@ -550,9 +550,8 @@ def do_rss_multi_node(
 
     Parameters
     ----------
-    mlip_type: str
-        Choose one specific MLIP type:
-        'GAP' | 'J-ACE' | 'NequIP' | 'M3GNet' | 'MACE'.
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted.
     mlip_path: str
         Path to the MLIP model.
     iteration_index: str
diff --git a/src/autoplex/data/rss/utils.py b/src/autoplex/data/rss/utils.py
index d0101f44b..d2f99a019 100644
--- a/src/autoplex/data/rss/utils.py
+++ b/src/autoplex/data/rss/utils.py
@@ -553,7 +553,7 @@ def build_traj():
 
 
 def minimize_structures(
-    mlip_type: str,
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"],
     mlip_path: str,
     iteration_index: str,
     structures: list[Structure],
@@ -580,9 +580,8 @@ def minimize_structures(
 
     Parameters
     ----------
-    mlip_type: str
-        Choose one specific MLIP type:
-        'GAP' | 'J-ACE' | 'NequIP' | 'M3GNet' | 'MACE'.
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted.
     mlip_path: str
         Path to the MLIP model.
     iteration_index: str
diff --git a/src/autoplex/fitting/common/flows.py b/src/autoplex/fitting/common/flows.py
index a17fc444b..9cbca388d 100644
--- a/src/autoplex/fitting/common/flows.py
+++ b/src/autoplex/fitting/common/flows.py
@@ -40,9 +40,8 @@ class MLIPFitMaker(Maker):
     ----------
     name : str
         Name of the flows produced by this maker.
-    mlip_type: str
-        Choose one specific MLIP type to be fitted:
-        'GAP' | 'J-ACE' | 'NEQUIP' | 'M3GNET' | 'MACE'
+    mlip_type: Literal["GAP", "J-ACE", "NEP", "NEQUIP", "M3GNET", "MACE"]
+        Choose one specific MLIP type to be fitted.
     hyperpara_opt: bool
         Perform hyperparameter optimization using XPOT
         (XPOT: https://pubs.aip.org/aip/jcp/article/159/2/024803/2901815)