diff --git a/src/lighteval/tasks/lighteval_task.py b/src/lighteval/tasks/lighteval_task.py
index 09341c947..6f460d2bb 100644
--- a/src/lighteval/tasks/lighteval_task.py
+++ b/src/lighteval/tasks/lighteval_task.py
@@ -41,7 +41,7 @@
 
 
 @dataclass
-class CustomEvaluationTask:
+class LightevalTaskConfig:
     name: str
     prompt_function: str
     hf_repo: str
@@ -95,7 +95,7 @@ def __post_init__(self):
 
 
 class LightevalTask:
-    def __init__(self, name: str, cfg: dict, cache_dir: Optional[str] = None, custom_tasks_module=None):
+    def __init__(self, name: str, cfg: LightevalTaskConfig, cache_dir: Optional[str] = None, custom_tasks_module=None):
         """
         Initialize a LightEval task.
 
@@ -115,8 +115,8 @@ def __init__(self, name: str, cfg: dict, cache_dir: Optional[str] = None, custom
         self._cfg = cfg
 
         # Dataset info
-        self.hf_repo = cfg["hf_repo"]
-        self.hf_subset = cfg["hf_subset"]
+        self.hf_repo = cfg.hf_repo
+        self.hf_subset = cfg.hf_subset
         self.dataset_path = self.hf_repo
         self.dataset_config_name = self.hf_subset
         self.dataset = None  # Delayed download
@@ -125,22 +125,22 @@ def __init__(self, name: str, cfg: dict, cache_dir: Optional[str] = None, custom
         self._docs = None
 
         # Managing splits and few shot
-        self.all_available_splits = as_list(cfg["hf_avail_splits"])
+        self.all_available_splits = as_list(cfg.hf_avail_splits)
         if cfg.get("evaluation_splits", None) is None:
             raise ValueError(f"The evaluation split for task {self.name} is None. Please select a valid split.")
 
-        self.evaluation_split = as_list(cfg["evaluation_splits"])
+        self.evaluation_split = as_list(cfg.evaluation_splits)
         if cfg.get("few_shots_split", None) is not None:
-            self.fewshot_split = as_list(cfg["few_shots_split"])
+            self.fewshot_split = as_list(cfg.few_shots_split)
         else:
             self.fewshot_split = as_list(self.get_first_possible_fewshot_splits())
         self.fewshot_sampler = FewShotSampler(
-            few_shots_select=cfg["few_shots_select"], few_shots_split=self.fewshot_split
+            few_shots_select=cfg.few_shots_select, few_shots_split=self.fewshot_split
         )
 
         # Metrics
-        self.metrics = as_list(cfg["metric"])
-        self.suite = as_list(cfg["suite"])
+        self.metrics = as_list(cfg.metric)
+        self.suite = as_list(cfg.suite)
         ignored = [metric for metric in self.metrics if Metrics[metric].value.category == MetricCategory.IGNORED]
         if len(ignored) > 0:
             hlog_warn(f"[WARNING] Not implemented yet: ignoring the metric {' ,'.join(ignored)} for task {self.name}.")
@@ -150,20 +150,20 @@ def __init__(self, name: str, cfg: dict, cache_dir: Optional[str] = None, custom
         # Data processing
         # to use once prompt formatting is managed as a module
         if custom_tasks_module is None:
-            self.formatter = getattr(tasks_prompt_formatting, cfg["prompt_function"])
-        elif hasattr(custom_tasks_module, cfg["prompt_function"]):
+            self.formatter = getattr(tasks_prompt_formatting, cfg.prompt_function)
+        elif hasattr(custom_tasks_module, cfg.prompt_function):
             # If we have a prompt in both the custom_tasks_module and our tasks_prompt_formatting
             # We take the prompt from the custom_tasks_module
-            if hasattr(tasks_prompt_formatting, cfg["prompt_function"]):
+            if hasattr(tasks_prompt_formatting, cfg.prompt_function):
                 hlog_warn(
-                    f"Be careful you are using custom prompt function {cfg['prompt_function']} and not the default one."
+                    f"Be careful you are using custom prompt function {cfg.prompt_function} and not the default one."
                 )
-            self.formatter = getattr(custom_tasks_module, cfg["prompt_function"])
+            self.formatter = getattr(custom_tasks_module, cfg.prompt_function)
         else:
-            self.formatter = getattr(tasks_prompt_formatting, cfg["prompt_function"])
-        self.generation_size = cfg["generation_size"]
-        self.stop_sequence = cfg["stop_sequence"]
-        self.output_regex = cfg["output_regex"]
+            self.formatter = getattr(tasks_prompt_formatting, cfg.prompt_function)
+        self.generation_size = cfg.generation_size
+        self.stop_sequence = cfg.stop_sequence
+        self.output_regex = cfg.output_regex
 
         # Save options
         self.save_queries: bool = False
diff --git a/src/lighteval/tasks/registry.py b/src/lighteval/tasks/registry.py
index 6738aad5a..1e7db339e 100644
--- a/src/lighteval/tasks/registry.py
+++ b/src/lighteval/tasks/registry.py
@@ -10,7 +10,7 @@
 from datasets.load import dataset_module_factory
 
 from lighteval.logging.hierarchical_logger import hlog, hlog_warn
-from lighteval.tasks.lighteval_task import LightevalTask
+from lighteval.tasks.lighteval_task import LightevalTask, LightevalTaskConfig
 
 
 # original is the reimplementation of original evals
@@ -202,7 +202,7 @@ def create_config_tasks(
         Dict[str, LightevalTask]: A dictionary of task names mapped to their corresponding LightevalTask classes.
     """
 
-    def create_task(name, cfg, cache_dir):
+    def create_task(name, cfg: LightevalTaskConfig, cache_dir: str):
         class LightevalTaskFromConfig(LightevalTask):
             def __init__(self, custom_tasks_module=None):
                 super().__init__(name, cfg, cache_dir=cache_dir, custom_tasks_module=custom_tasks_module)
@@ -222,6 +222,6 @@ def __init__(self, custom_tasks_module=None):
             continue
         for suite in line["suite"]:
             if suite in DEFAULT_SUITES:
-                tasks_with_config[f"{suite}|{line['name']}"] = line
+                tasks_with_config[f"{suite}|{line['name']}"] = LightevalTaskConfig(**line)
 
     return {task: create_task(task, cfg, cache_dir=cache_dir) for task, cfg in tasks_with_config.items()}
diff --git a/tasks_examples/custom_tasks/custom_evaluation_tasks.py b/tasks_examples/custom_tasks/custom_evaluation_tasks.py
index f579b7dd5..0ed928e59 100644
--- a/tasks_examples/custom_tasks/custom_evaluation_tasks.py
+++ b/tasks_examples/custom_tasks/custom_evaluation_tasks.py
@@ -9,38 +9,38 @@
 from typing import Dict, List, Tuple
 
 from lighteval.metrics import Metrics
-from lighteval.tasks.lighteval_task import CustomEvaluationTask
+from lighteval.tasks.lighteval_task import LightevalTaskConfig
 from lighteval.tasks.requests import Doc
 from lighteval.tasks.tasks_prompt_formatting import LETTER_INDICES
 
 
-_TASKS_STRINGS: List[Tuple[CustomEvaluationTask, str]] = []
-_TASKS: List[CustomEvaluationTask] = []
+_TASKS_STRINGS: List[Tuple[LightevalTaskConfig, str]] = []
+_TASKS: List[LightevalTaskConfig] = []
 
 ## COMMON_SENSE_REASONING_TASKS ##
 COMMON_SENSE_REASONING_TASKS = [
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="hellaswag",
         prompt_function="hellaswag_prompt",
         hf_repo="hellaswag",
         hf_subset="default",
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="winogrande",
         prompt_function="winogrande",
         hf_repo="winogrande",
         hf_subset="winogrande_xl",
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="piqa",
         prompt_function="piqa_harness",
         hf_repo="piqa",
         hf_subset="plain_text",
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="siqa",
         prompt_function="siqa_prompt",
         hf_repo="lighteval/siqa",
@@ -48,14 +48,14 @@
         hf_avail_splits=["train", "validation"],
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="openbookqa",
         prompt_function="openbookqa",
         hf_repo="openbookqa",
         hf_subset="main",
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="arc:easy",
         prompt_function="arc",
         hf_repo="ai2_arc",
@@ -64,7 +64,7 @@
         generation_size=1,
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="arc:challenge",
         prompt_function="arc",
         hf_repo="ai2_arc",
@@ -73,7 +73,7 @@
         generation_size=1,
         metric=["loglikelihood_acc", "loglikelihood_acc_norm_nospace"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="commonsense_qa",
         prompt_function="commonsense_qa_prompt",
         hf_repo="commonsense_qa",
@@ -131,7 +131,7 @@ def preprocess(text):
 ## WORLD_KNOWLEDGE_TASKS ##
 
 WORLD_KNOWLEDGE_TASKS = [
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="trivia_qa",
         prompt_function="triviaqa",
         hf_repo="trivia_qa",
@@ -140,7 +140,7 @@ def preprocess(text):
         generation_size=20,
         stop_sequence=["\n", ".", ","],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="natural_questions",
         prompt_function="natural_questions_prompt",
         hf_repo="lighteval/natural_questions_clean",
@@ -170,14 +170,14 @@ def natural_questions_prompt(line, task_name: str = None):
 ## Reading comprehension ##
 
 READING_COMP_TASKS = [
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="super_glue:boolq",
         prompt_function="boolq_prompt",
         hf_repo="super_glue",
         hf_subset="boolq",
         metric=["target_perplexity"],
     ),
-    CustomEvaluationTask(
+    LightevalTaskConfig(
         name="quac",
         prompt_function="quac",
         hf_repo="lighteval/quac_helm",
@@ -204,7 +204,7 @@ def boolq_prompt(line, task_name: str = None):
 
 
 ## MATH ##
-class CustomMathEvaluationTask(CustomEvaluationTask):
+class CustomMathEvaluationTask(LightevalTaskConfig):
     """Custom class for math tasks with all the defaults set"""
 
     def __init__(
@@ -251,7 +251,7 @@ def __init__(
     CustomMathEvaluationTask(name="math:prealgebra", hf_subset="prealgebra"),
     CustomMathEvaluationTask(name="math:precalculus", hf_subset="precalculus"),
 ]
-GSM8K = CustomEvaluationTask(
+GSM8K = LightevalTaskConfig(
     name="gsm8k",
     prompt_function="gsm8k",
     hf_repo="gsm8k",
@@ -272,7 +272,7 @@ def __init__(
 
 
 ## MMLU ##
-class CustomMMLUEvaluationTask(CustomEvaluationTask):
+class CustomMMLUEvaluationTask(LightevalTaskConfig):
     def __init__(
         self,
         name,
@@ -415,7 +415,7 @@ def mmlu_prompt(line, task_name: str = None):
 ## BBH ##
 
 
-class CustomBBHEvaluationTask(CustomEvaluationTask):
+class CustomBBHEvaluationTask(LightevalTaskConfig):
     def __init__(
         self,
         name,
@@ -506,7 +506,7 @@ def bbh_prompt(line, task_name: str = None):
 
 
 ## AGI eval ##
-class CustomAGIEvalEvaluationTask(CustomEvaluationTask):
+class CustomAGIEvalEvaluationTask(LightevalTaskConfig):
     def __init__(
         self,
         name,
@@ -617,7 +617,7 @@ def agi_eval_prompt_no_letters(line, task_name: str = None):
 
 
 ## HUMAN EVAL ##
-# human_eval = CustomEvaluationTask(
+# human_eval = LightevalTaskConfig(
 #         name="human_eval",
 #         prompt_function="human_eval",
 #         hf_repo="lighteval/human_eval",