LFM2.5 is a family of hybrid models designed for on-device deployment. It builds on the LFM2 architecture with extended pre-training and reinforcement learning.

Our most compact model yet: 230M parameters that punch above their weight, bringing real capability to the tightest memory and compute budgets.
Fast edge inference: Best throughput from low-cost CPUs to production GPUs, running at 213 tok/s decode speed on Galaxy S25 Ultra and 42 tok/s on a Raspberry Pi 5.
Built for agentic tasks: Distilled from LFM2.5-350M and refined with multi-stage reinforcement learning, making it well-suited for tool use and data extraction.

Find more information about LFM2.5-230M in our blog post.

🗒️ Model Details

Model	Parameters	Description
LFM2.5-230M-Base	230M	Pre-trained base model for fine-tuning
LFM2.5-230M	230M	General-purpose instruction-tuned model

LFM2.5-230M is a general-purpose text-only model with the following features:

Number of parameters: 230M
Number of layers: 14 (8 double-gated convolution blocks + 6 GQA blocks)
Training budget: 19T tokens
Context length: 32,768 tokens
Vocabulary size: 65,536
Knowledge cutoff: Mid-2024
Languages: English, Arabic, Chinese, French, German, Italian, Japanese, Korean, Portuguese, Spanish
Generation parameters:
- temperature: 0.1
- top_k: 50
- repetition_penalty: 1.05

Model	Description
LFM2.5-230M	Original model checkpoint in native format. Best for fine-tuning or inference with Transformers, vLLM, and SGLang.
LFM2.5-230M-GGUF	Quantized format for llama.cpp and compatible tools. Optimized for edge inference and local deployment.
LFM2.5-230M-ONNX	ONNX Runtime format for cross-platform deployment.
LFM2.5-230M-MLX	MLX format for Apple Silicon. Optimized for fast inference on Mac devices.

We recommend using it for data extraction and lightweight on-device agentic pipelines. It is not recommended for reasoning-heavy workloads such as advanced math, code generation, or creative writing.

Chat Template

LFM2.5 uses a ChatML-like format. See the Chat Template documentation for details. Example:

<|startoftext|><|im_start|>system
You are a helpful assistant trained by Liquid AI.<|im_end|>
<|im_start|>user
What is C. elegans?<|im_end|>
<|im_start|>assistant

You can use tokenizer.apply_chat_template() to format your messages automatically.

Tool Use

LFM2.5 supports function calling in four steps:

Function definition: Provide the list of tools as a JSON object in the system prompt, or use tokenizer.apply_chat_template() with tools=....
Function call: By default, LFM2.5 writes Pythonic function calls (a Python list between <|tool_call_start|> and <|tool_call_end|> special tokens), as the assistant answer. You can override this behavior by asking the model to output JSON function calls in the system prompt.
Function execution: Execute the call and return the result with the tool role.
Final answer: LFM2.5 interprets the tool output and returns a plain-text answer addressing the original prompt.

See the Tool Use documentation for the full guide. Example:

<|startoftext|><|im_start|>system
List of tools: [{"name": "get_candidate_status", "description": "Retrieves the current status of a candidate in the recruitment process", "parameters": {"type": "object", "properties": {"candidate_id": {"type": "string", "description": "Unique identifier for the candidate"}}, "required": ["candidate_id"]}}]<|im_end|>
<|im_start|>user
What is the current status of candidate ID 12345?<|im_end|>
<|im_start|>assistant
<|tool_call_start|>[get_candidate_status(candidate_id="12345")]<|tool_call_end|>Checking the current status of candidate ID 12345.<|im_end|>
<|im_start|>tool
[{"candidate_id": "12345", "status": "Interview Scheduled", "position": "Clinical Research Associate", "date": "2023-11-20"}]<|im_end|>
<|im_start|>assistant
The candidate with ID 12345 is currently in the "Interview Scheduled" stage for the position of Clinical Research Associate, with an interview date set for 2023-11-20.<|im_end|>

🏃 Inference

LFM2.5 is supported by many inference frameworks. See the Inference documentation for the full list.

Name	Description	Docs	Notebook
Transformers	Simple inference with direct access to model internals.	Link	Colab link
vLLM	High-throughput production deployments with GPU.	Link	Colab link
llama.cpp	Cross-platform inference with CPU offloading.	Link	Colab link
MLX	Apple's machine learning framework optimized for Apple Silicon.	Link	—
LM Studio	Desktop application for running LLMs locally.	Link	—
SGLang	High-throughput production deployments with GPU.	Link	-

Quick start with Transformers (compatible with transformers>=5.0.0):

python

from transformers import AutoModelForCausalLM, AutoTokenizer, TextStreamer

model_id = "LiquidAI/LFM2.5-230M"
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    device_map="auto",
    dtype="bfloat16",
#   attn_implementation="flash_attention_2" <- uncomment on compatible GPU
)
tokenizer = AutoTokenizer.from_pretrained(model_id)
streamer = TextStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True)

prompt = "What is C. elegans?"

input_ids = tokenizer.apply_chat_template(
    [{"role": "user", "content": prompt}],
    add_generation_prompt=True,
    return_tensors="pt",
    tokenize=True,
)["input_ids"].to(model.device)

output = model.generate(
    input_ids,
    do_sample=True,
    temperature=0.1,
    top_k=50,
    repetition_penalty=1.05,
    max_new_tokens=512,
    streamer=streamer,
)

🔧 Fine-Tuning

We recommend fine-tuning LFM2.5 for your specific use case to achieve the best results.

Name	Description	Docs	Notebook
CPT (Unsloth)	Continued Pre-Training using Unsloth for text completion.	Link	Colab link
CPT (Unsloth)	Continued Pre-Training using Unsloth for translation.	Link	Colab link
SFT (Unsloth)	Supervised Fine-Tuning with LoRA using Unsloth.	Link	Colab link
SFT (TRL)	Supervised Fine-Tuning with LoRA using TRL.	Link	Colab link
DPO (TRL)	Direct Preference Optimization with LoRA using TRL.	Link	Colab link
GRPO (Unsloth)	GRPO with LoRA using Unsloth.	Link	Colab link
GRPO (TRL)	GRPO with LoRA using TRL.	Link	Colab link

📊 Performance

Benchmarks

Model	GPQA Diamond	MMLU-Pro	IFEval	IFBench	Multi-IF
LFM2.5-230M	25.41	20.25	71.71	38.40	37.70
LFM2.5-350M	30.64	20.01	76.96	40.69	44.92
LFM2-350M	27.58	19.29	64.96	18.20	32.92
Granite 4.0-H-350M	22.32	13.14	61.27	17.22	28.70
Granite 4.0-350M	25.91	12.84	53.48	15.98	24.21
Qwen3.5-0.8B (Instruct)	27.41	37.42	59.94	22.87	41.68
Gemma 3 1B IT	23.89	14.04	63.49	20.33	44.25

Model	CaseReportBench	BFCLv3	BFCLv4	τ²-Bench Telecom	τ²-Bench Retail
LFM2.5-230M	22.51	43.26	21.03	5.26	13.68
LFM2.5-350M	32.45	44.11	21.86	18.86	17.84
LFM2-350M	11.67	22.95	12.29	10.82	5.56
Granite 4.0-H-350M	12.44	43.07	13.28	13.74	6.14
Granite 4.0-350M	0.84	39.58	13.73	2.92	6.14
Qwen3.5-0.8B (Instruct)	13.83	35.08	18.70	12.57	6.14
Gemma 3 1B IT	2.28	16.61	7.17	9.36	6.43

CPU Inference

GPU Inference

📬 Contact

Got questions or want to connect? Join our Discord community
If you are interested in custom solutions with edge deployment, please contact our sales team.

Citation

bibtex

@article{liquidAI2026230M,
  author = {Liquid AI},
  title = {LFM2.5-230M: Built to Run Anywhere},
  journal = {Liquid AI Blog},
  year = {2026},
  note = {www.liquid.ai/blog/lfm2-5-230m},
}

bibtex

@article{liquidai2025lfm2,
  title={LFM2 Technical Report},
  author={Liquid AI},
  journal={arXiv preprint arXiv:2511.23404},
  year={2025}
}