Gemma-SEA-LION-v4-27B
Last updated: 2025-08-25
SEA-LION is a collection of Large Language Models (LLMs) which have been pretrained and instruct-tuned for the Southeast Asia (SEA) region.
Introduction
SEA-LION stands for Southeast Asian Languages In One Network.
Gemma-SEA-LION-v4-27B is based on Gemma 3 (which supports over 100 languages) and is a multilingual model that has undergone continued pre-training on approximately 500B tokens, sampled from a pool of 1 trillion tokens across 11 SEA languages: Burmese, English, Indonesia, Khmer, Lao, Malay, Mandarin, Tagalog, Tamil, Thai and Vietnamese, to create Gemma-SEA-LION-v4-27B. Subsequently, we performed post-training on Gemma-SEA-LION-v4-27B using multiple RL algorithms to produce Gemma-SEA-LION-v4-27B-IT.
Gemma-SEA-LION-v4-27B inherits Gemma 3’s:
Large 128K context length
Image and text understanding capabilities, including document comprehension, visual Q&A, and image-grounded reasoning
Advanced function calling and structured outputs to allow for seamless integration into larger systems
For tokenization, the model employs the default tokenizer used in Gemma 3 27B IT.
At a glance:
Developed by: Products Pillar, AI Singapore
Funded by: Singapore NRF
Shared by: Products Pillar, AI Singapore
Model type: Decoder
Context length: 128k
Language(s): Burmese, English, Indonesia, Khmer, Lao, Malay, Mandarin, Tagalog, Tamil, Thai and Vietnamese
License: Gemma Terms of Use
Continued pretrained and finetuned from model: Gemma-3-27B-IT
As of 25 Aug 2025, Gemma-SEA-LION-v4-27B-IT excels at Southeast Asian (SEA) tasks when compared to other open models with fewer than 200 billion parameters and demonstrates performance comparable to that of larger and top closed models. For detailed rankings, please refer to the leaderboard.
Training Details
Training Data
The dataset comprises Burmese, English, Indonesia, Khmer, Lao, Malay, Mandarin, Tagalog, Tamil, Thai and Vietnamese languages, collected from a mixture of sources including web data, code, open-source datasets, and synthetically generated datasets, amounting to a total of 500 billion tokens.
The 500 billion tokens are sampled from a much larger pool of 1 trillion tokens from open-sourced datasets with the optimal datamix shown below determined by our experiments.
Code
StarCoder (OLMo 2 Version)
50B
10
10
EN
Fineweb-Edu
80B
16
40
DCLM-OLMo2-HQ
80B
16
Non-CC-EN
40B
8
ZH
SEA-LION Pile v1
13.5B
2.7
9
Fineweb2
13.5B
2.7
Fineweb2-HQ
4.5B
0.9
VI
SEA-LION Pile v1
4.25B
0.85
8.5
SEA-LION Pile v2
12.75B
2.55
Fineweb2
8.5B
1.7
Non-CC-VI
17B
3.4
ID
SEA-LION Pile v1
5.66B
1.13
8.5
SEA-LION Pile v2
17B
3.4
Fineweb2
11.33B
2.27
Non-CC-ID
8.5B
1.7
TH
SEA-LION Pile v1
3.035B
0.61
8.5
SEA-LION Pile v2
9.107B
1.82
Fineweb2
3.035B
0.61
WangChanBERTa
3.035B
0.61
Dolmav1
3.035B
0.61
Non-CC-TH
21.25B
4.25
TL, TA, MS, KM, LO and MY
ALL_LANG
77.5B
15.5
15.5
Note:
All token counts are counted using Gemma 3 tokenizer.
Pre-training was conducted with batches of 8k token lengths.
SEA-Pile v2 is processed from Common Crawl WARC from October 2020 to April 2024.
Tamil news is sourced with permission from Seithi
We utilized 0.5% of synthetically generated datasets for the low-resource language, Khmer.
Training Procedure
Training regime:
Precision
bfloat16
Optimizer
decoupled_adamw
Scheduler
CosineAnnealing
Learning Rate
4.00E-08
Global Batch Size
1024
Gemma-SEA-LION-v4-27B has undergone post-training using a QA pairs dataset in Burmese, English, Indonesia, Khmer, Lao, Malay, Tagalog, Tamil, Thai and Vietnamese, comprising approximately 10M samples in total, to create Gemma-SEA-LION-v4-27B-IT.
The instruction fine-tuning dataset combines our SEA-Instruct, Infinity-Instruct, and OpenMath-Instruct 2 with open-source datasets. For the Online RL datasets, open sourced datasets such as nvidia/Llama-Nemotron-Post-Training-Dataset (RL set) and zwhe99/DeepMath-103K were used. For alignment, rejected-chosen pairs are generated from the target model, with the chosen responses obtained by rewriting and improving upon the rejected outputs. Prompt sampling is guided by a gradient-based analysis process.
Our post-training workflow consists of multiple stages: instruction fine-tuning, model merging, online RL for both instruction following and math using DRGPPO, and then followed by on-policy alignment via APO.
Evaluation
We evaluated Gemma-SEA-LION-v4-27B models on both general language capabilities and instruction-following capabilites.
Testing Data, Factors & Metrics
Testing Data
We evaluated Gemma-SEA-LION-v4-27B models on both general language capabilities and instruction-following capabilites.
General language capabilities
For the evaluation of general language capabilities, we employed the SEA-HELM evaluation benchmark across a variety of tasks. These tasks include Question Answering (QA), Sentiment Analysis (Sentiment), Toxicity Detection (Toxicity), Translation in both directions (Eng>Lang & Lang>Eng), Abstractive Summarisation (Abssum), Causal Reasoning (Causal), Natural Language Inference (NLI), Linguistic Diagnostics (LINDSEA), Cultural Knowledge (Kalahi) and Global MMLU Lite.
Instruction-following and Multi-turn Chat
We evaluated the models on instruction-following and multi-turn chat capabilities with SEA-IFEval (based on IFEval) and SEA-MTBench (based on MT-Bench) respectively. The two datasets were originally in English, the linguists and native speakers in the team worked together to filter, localise and translate the datasets into the respective target languages to ensure that the examples remained reasonable, meaningful and natural.
Factors
All evaluations were run with the model specific generation parameters defined in the model config. Each evaluation comprised of 8 runs with different seeds and the final results were averaged across these runs.
For all tasks, the model was expected to provide an answer tag from which the answer was automatically extracted. For tasks where options were provided, the answer should comprise one of the pre-defined options.
The evaluation was done zero-shot with native prompts on a sample of 100-1000 instances for each dataset.
SEA-IFEval
SEA-IFEval evaluates a model's ability to adhere to constraints provided in the prompt, for example beginning a response with a specific word/phrase or answering with a certain number of sections. Additionally, accuracy is normalised by the proportion of responses in the correct language (if the model performs the task correctly but responds in the wrong language, it is judged to have failed the task).
SEA-MTBench
SEA-MTBench evaluates a model's ability to engage in multi-turn (2 turns) conversations and respond in ways that align with human needs. We use gpt-4.1-2025-04-14 as the judge model and compare against gpt-4.1-2025-04-14 as the baseline model. The metric used is the weighted win rate against the baseline model (i.e. average win rate across each category: Math, Reasoning, STEM, Humanities, Roleplay, Writing, Extraction).
Metrics
The following metrics were used:
Sentiment Analysis
Accuracy
Extractive QA (ID, VI, TH, TA)
ChrF++
MCQ-QA (TL, MY, MS)
Accuracy
Metaphor
Accuracy
Abstractive Summarisation
Rouge-L
Translations
MetricX-24 score (with reference)
Causal Reasoning
Accuracy
Natural Language Inference
Accuracy
LINDSEA
Accuracy
Global MMLU Lite
Accuracy
Kalahi
Accuracy
SEA-IFEval
Accuracy
SEA-MTBench
Win rate against a reference
Toxicity Detection
Accuracy
Results
For details on Gemma-SEA-LION-v4-27B model performances, please refer to the SEA-HELM leaderboard, Leaderboard results on SEA-HELM.
Gemma-SEA-LION-v4-27B-IT Quantized Version
The following quantized versions of our Gemma-SEA-LION-v4-27B-IT model are available:
Gemma-SEA-LION-v4-27B-IT-Q4_K_M
Gemma-SEA-LION-v4-27B-IT-Q8_0
Gemma-SEA-LION-v4-27B-IT-BF16
Gemma-SEA-LION-v4-27B-IT-NVFP4
Gemma-SEA-LION-v4-27B-IT-FP8-Dynamic
Please refer to our Download the Models section for more details on how to access them.
How to Get Started with the Model
Download the Models
Gemma-SEA-LION-v4-27B models are available for download via the following channels: 🤗HuggingFace SEA-LION v4 Collection
Gemma-SEA-LION-v4-27B
Gemma-SEA-LION-v4-27B-IT
Gemma-SEA-LION-v4-27B-IT-GGUF
Gemma-SEA-LION-v4-27B-IT-NVFP4
Gemma-SEA-LION-v4-27B-IT-FP8-Dynamic
Usage
Use the code below to get started with the model using the 🤗 Transformers library.
from transformers import pipeline
import torch
pipe = pipeline(
"text-generation",
model="aisingapore/Gemma-SEA-LION-v4-27B-IT",
device="cuda",
torch_dtype=torch.bfloat16
)
messages = [
{
"role": "system",
"content": [{"type": "text", "text": "You are a helpful assistant."}]
},
{
"role": "user",
"content": [
{"type": "text", "text": "Write a poem on southeast asian countries in Indonesian."}
]
}
]
output = pipe(text=messages, max_new_tokens=200)
print(output[0]["generated_text"][-1]["content"])Disclaimer
The models have not been aligned for safety. Developers and users should perform their own safety fine-tuning and related security measures. In no event shall the authors be held liable for any claims, damages, or other liabilities arising from the use of the released weights and codes.
Bias, Risks, and Limitations
The models were not tested for robustness against adversarial prompting. It is important for users to be aware that our models exhibit certain limitations that warrant consideration. Like many LLMs, the models can hallucinate and occasionally generates irrelevant content, introducing fictional elements that are not grounded in the provided context. Users should also exercise caution in interpreting and validating the model's responses due to the potential inconsistencies.
Limitations
In terms of vision capability, Gemma-SEA-LION-v4-27B has been trained and fine-tuned exclusively on the text back-end. As a result, its vision capabilities are expected to be comparable to those of Gemma 3 IT 27B, and may not exhibit significant improvements or differences in this area. 🤗 google/gemma-3-27b-it
More Information
This is the repository for the commercial instruction-tuned model. The models have not been aligned for safety. Developers and users should perform their own safety fine-tuning and related security measures. In no event shall the authors be held liable for any claims, damages, or other liabilities arising from the use of the released weights and codes.
For more info, please contact us at SEA-LION Inquiry Form or [email protected]
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