Instructions to use FINAL-Bench/Darwin-Chimera-4B-Gen1 with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use FINAL-Bench/Darwin-Chimera-4B-Gen1 with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("text-generation", model="FINAL-Bench/Darwin-Chimera-4B-Gen1")
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# Load model directly
from transformers import AutoTokenizer, AutoModelForCausalLM

tokenizer = AutoTokenizer.from_pretrained("FINAL-Bench/Darwin-Chimera-4B-Gen1")
model = AutoModelForCausalLM.from_pretrained("FINAL-Bench/Darwin-Chimera-4B-Gen1", device_map="auto")
messages = [
    {"role": "user", "content": "Who are you?"},
]
inputs = tokenizer.apply_chat_template(
	messages,
	add_generation_prompt=True,
	tokenize=True,
	return_dict=True,
	return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=40)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

Notebooks
Google Colab
Kaggle
Local Apps Settings

vLLM

How to use FINAL-Bench/Darwin-Chimera-4B-Gen1 with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "FINAL-Bench/Darwin-Chimera-4B-Gen1"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "FINAL-Bench/Darwin-Chimera-4B-Gen1",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/FINAL-Bench/Darwin-Chimera-4B-Gen1

SGLang

How to use FINAL-Bench/Darwin-Chimera-4B-Gen1 with SGLang:

Install from pip and serve model

# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "FINAL-Bench/Darwin-Chimera-4B-Gen1" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "FINAL-Bench/Darwin-Chimera-4B-Gen1",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker images

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "FINAL-Bench/Darwin-Chimera-4B-Gen1" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "FINAL-Bench/Darwin-Chimera-4B-Gen1",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Docker Model Runner
How to use FINAL-Bench/Darwin-Chimera-4B-Gen1 with Docker Model Runner:
```
docker model run hf.co/FINAL-Bench/Darwin-Chimera-4B-Gen1
```

Darwin-Chimera-4B-Gen1 (Backbone · Research)

⚠️ Generation-1 backbone — a research checkpoint, not a product. Private repo. This is a Qwen3-4B derivative, not a from-scratch model. We state this explicitly.

What this is

Darwin-Chimera-4B-Gen1 is the first-generation adapter backbone of the Darwin-Chimera line. We take Qwen/Qwen3-4B and re-wire only its attention via VIDRAFT attention-healing, while freezing the FFN, embeddings, and lm_head, and convert the attention to a sliding-window configuration.

The purpose is to verify that a VIDRAFT-healed attention circuit can sit on a frozen knowledge core — the foundation for Generation-2 (FFN cross-breeding with other models).

Honest weight fingerprint (vs Qwen/Qwen3-4B)

Measured relative change ||A−B|| / ||A|| against the original Qwen3-4B:

Component	Relative change	Note
FFN (mlp)	0.000%	frozen — identical to Qwen3-4B
embed / lm_head	0.000%	frozen — identical
attention (self_attn)	3.0% mean (7.5% max)	healed
layernorm	0.04%	minimal
config (hidden/inter/layers/vocab)	identical	only `sliding_window=4096` added

→ At the weight level this checkpoint is clearly a Qwen3-4B derivative. We make no claim of independence or from-scratch training. Knowledge/FFN is 100% Qwen3-4B.

Training

Method: attention-only healing (self_attn + per-layer norms trainable; FFN/embed/lm_head frozen)
Attention: full → sliding window (4096), 5:1 sliding:full layer ratio
Tokens: ~3B (Korean-centric annealing mix)
Base: Qwen/Qwen3-4B (Apache 2.0)

Evaluation (base, zero-shot — reference only)

Generation: 6/6 domains coherent (Korean / English / science / code / math / biology), no gibberish
KMMLU (6 subjects, 240Q, zero-shot, greedy): 27.1% vs Qwen3-4B base 13.3% (same protocol, +13.8pp)
Absolute KMMLU is low because this is a base (non-instruct) checkpoint; instruction-following and benchmark quality are expected to come from a later SFT stage. The comparison above is a same-condition relative measurement, not an absolute SOTA claim.

Intended use

Backbone for Darwin-Chimera Generation-2 (cross-architecture FFN cross-breeding research)
Research and experimentation only. Not for production.

License & attribution

Apache 2.0, inherited from Qwen/Qwen3-4B. Built on Qwen/Qwen3-4B.

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Safetensors

Model size

4B params

Tensor type

BF16

Model tree for FINAL-Bench/Darwin-Chimera-4B-Gen1

Base model

Qwen/Qwen3-4B-Base

Finetuned

Qwen/Qwen3-4B

Finetuned

(1042)

this model