diff --git a/examples/custom_models/seamless4mt_model.py b/examples/custom_models/seamless4mt_model.py
new file mode 100644
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+++ b/examples/custom_models/seamless4mt_model.py
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+# MIT License
+
+# Copyright (c) 2024 The HuggingFace Team
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import logging
+from typing import Optional
+
+import pycountry
+from tqdm import tqdm
+from transformers import AutoProcessor, SeamlessM4Tv2ForTextToText
+
+from lighteval.data import GenerativeTaskDataset
+from lighteval.models.abstract_model import LightevalModel, ModelInfo, TokenSequence
+from lighteval.models.model_output import (
+    GenerativeResponse,
+    LoglikelihoodResponse,
+    LoglikelihoodSingleTokenResponse,
+)
+from lighteval.tasks.requests import (
+    GreedyUntilRequest,
+    LoglikelihoodRequest,
+    LoglikelihoodRollingRequest,
+    LoglikelihoodSingleTokenRequest,
+)
+
+
+logger = logging.getLogger(__name__)
+
+
+class Seamless4MTClient(LightevalModel):
+    def __init__(self, config, env_config) -> None:
+        self.model = config.model
+        self.model_definition_file_path = config.model_definition_file_path
+
+        self.model_info = ModelInfo(
+            model_name=config.model,
+            model_sha="",
+            model_dtype=None,
+            model_size="",
+        )
+        self._tokenizer = AutoProcessor.from_pretrained("facebook/seamless-m4t-v2-large")
+        self._model = SeamlessM4Tv2ForTextToText.from_pretrained("facebook/seamless-m4t-v2-large")
+
+    def _convert_to_iso3(self, lang_code: str) -> str:
+        """Convert 2-letter ISO code to 3-letter ISO code."""
+        try:
+            return pycountry.languages.get(alpha_2=lang_code.lower()).alpha_3
+        except AttributeError:
+            # If conversion fails, return the original code
+            return lang_code
+
+    def greedy_until(
+        self,
+        requests: list[GreedyUntilRequest],
+        override_bs: Optional[int] = None,
+    ) -> list[GenerativeResponse]:
+        """
+        Generates responses using a greedy decoding strategy until certain ending conditions are met.
+        Results are cached to disk to avoid repeated translations.
+
+        Args:
+            requests (list[Request]): list of requests containing the context and ending conditions.
+            override_bs (int, optional): Override the batch size for generation. Defaults to None.
+
+        Returns:
+            list[GenerativeResponse]: list of generated responses.
+        """
+
+        def get_langs(task_name: str) -> tuple[str, str]:
+            src, tgt = task_name.split("|")[1].split(":")[-1].split("-")
+            return self._convert_to_iso3(src), self._convert_to_iso3(tgt)
+
+        # Prepare all inputs first
+        prepared_requests = []
+        for request in requests:
+            src_lang, tgt_lang = get_langs(request.task_name)
+            request.context = request.context.replace(f"{src_lang.upper()}: ", "").replace(
+                f"\n{tgt_lang.upper()}: ", ""
+            )
+            request.tokenized_context = self._tokenizer(
+                text=request.context, src_lang=src_lang, return_tensors="pt", padding=True
+            )
+            prepared_requests.append(request)
+
+        # Create dataset after preparation
+        dataset = GenerativeTaskDataset(requests=prepared_requests, num_dataset_splits=self.DATASET_SPLITS)
+        results = []
+        batch_size = override_bs or 32
+
+        for split_start, split_end in tqdm(
+            dataset.splits_start_end_iterator(),
+            total=dataset.num_dataset_splits,
+            desc="Splits",
+            position=0,
+            disable=False,
+        ):
+            # Get all requests for this split directly from sorted_data
+            current_requests = dataset.sorted_data[split_start:split_end]
+
+            # Process in batches
+            for batch_idx in range(0, len(current_requests), batch_size):
+                batch = current_requests[batch_idx : batch_idx + batch_size]
+
+                # Batch tokenize all inputs together instead of concatenating pre-tokenized inputs
+                batch_texts = [r.context for r in batch]
+                src_lang = get_langs(batch[0].task_name)[0]  # All source languages should be the same in a batch
+
+                # Unpack the tokenizer output into input_ids and attention_mask
+                input_ids, attention_mask = self._tokenizer(
+                    text=batch_texts, src_lang=src_lang, return_tensors="pt", padding=True
+                ).values()
+
+                tgt_langs = [get_langs(r.task_name)[1] for r in batch]
+                assert set(tgt_langs) == {tgt_langs[0]}, "All target languages must be the same"
+
+                # Use unpacked values directly
+                output_ids = self._model.generate(
+                    input_ids=input_ids, attention_mask=attention_mask, tgt_lang=tgt_langs[0]
+                )
+                translations = self._tokenizer.batch_decode(output_ids, skip_special_tokens=True)
+
+                # Create responses for the batch
+                for input_tokens, output_tokens, translation in zip(input_ids, output_ids, translations):
+                    results.append(
+                        GenerativeResponse(
+                            input_tokens=input_tokens,
+                            generated_tokens=output_tokens,
+                            result=translation,
+                            logits=None,
+                        )
+                    )
+
+        return dataset.get_original_order(results)
+
+    @property
+    def tokenizer(self):
+        return self._tokenizer
+
+    def tok_encode(self, str_to_encode: str | list[str], add_special_tokens: Optional[bool] = None) -> TokenSequence:
+        return self._tokenizer(
+            text=str_to_encode, return_tensors="pt", padding=True, add_special_tokens=add_special_tokens or False
+        )
+
+    @property
+    def add_special_tokens(self) -> bool:
+        return False
+
+    @property
+    def max_length(self) -> int:
+        """Return the maximum sequence length of the model."""
+        return 4096
+
+    def loglikelihood(
+        self, requests: list[LoglikelihoodRequest], override_bs: Optional[int] = None
+    ) -> list[LoglikelihoodResponse]:
+        """Tokenize the context and continuation and compute the log likelihood of those
+        tokenized sequences.
+        """
+        raise NotImplementedError
+
+    def loglikelihood_rolling(
+        self, requests: list[LoglikelihoodRollingRequest], override_bs: Optional[int] = None
+    ) -> list[LoglikelihoodResponse]:
+        """This function is used to compute the log likelihood of the context for perplexity metrics."""
+        raise NotImplementedError
+
+    def loglikelihood_single_token(
+        self, requests: list[LoglikelihoodSingleTokenRequest], override_bs: Optional[int] = None
+    ) -> list[LoglikelihoodSingleTokenResponse]:
+        """Tokenize the context and continuation and compute the log likelihood of those
+        tokenized sequences.
+        """
+        raise NotImplementedError