Athenea-4B-Thinking

Athenea-4B-Thinking is a fine-tuned version of huihui-ai/Huihui-Qwen3-4B-Thinking-2507-abliterated, designed as a general-purpose reasoning model capable of handling mathematical, multilingual, and conversational reasoning tasks.
Trained on diverse, high-quality reasoning data with explicit <think> and </think> traces, this model represents the core generalist version of the Athenea family, intended as a foundation for specialized reasoning variants.

⚠️ Important Note: This model uses an abliterated (uncensored) base version, providing full expressive freedom and unrestricted output generation. Users are fully responsible for any use or content produced by the model. It is intended exclusively for research and experimentation purposes.

🎯 Model Description

Athenea-4B-Thinking leverages the structured reasoning framework of Huihui-Qwen3 and expands it across multiple domains and languages. It serves as a multidomain reasoning model, performing well in both conversational and analytical contexts.

Key features:

Step-by-step reasoning within <think> blocks
General reasoning across math, language, and logic
Multilingual understanding and response generation
Uncensored reasoning output for transparency
Improved logical consistency through focused fine-tuning
Compatible with open inference frameworks (Transformers, vLLM, etc.)

The model was fine-tuned using the dataset Aquiles-ai/Athenea-40k.

Note: Fine-tuning was performed using Kronos, Aquiles-ai’s proprietary enterprise fine-tuning system.

💻 Usage

Installation

uv pip install transformers torch accelerate

Basic Inference

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

model = AutoModelForCausalLM.from_pretrained("Aquiles-ai/Athenea-4B-Thinking",
        dtype=torch.bfloat16,
        trust_remote_code=True,
        device_map="auto",
        attn_implementation="flash_attention_2") # Requires flash-attn

# Without flash-attn:
# model = AutoModelForCausalLM.from_pretrained("Aquiles-ai/Athenea-4B-Thinking",
#     dtype="auto",
#     device_map="auto"
# )

tokenizer = AutoTokenizer.from_pretrained("Aquiles-ai/Athenea-4B-Thinking", trust_remote_code=True)
messages = [
    {"role": "user", "content": "Hey, explain to me in simple terms how reinforcement learning works."}
]

inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
).to('cuda')

with torch.no_grad():
    output = model.generate(
        **inputs,
        max_new_tokens=8092,
        pad_token_id=tokenizer.eos_token_id,
        eos_token_id=tokenizer.eos_token_id,
    )

# Decode and print the output
print(tokenizer.decode(output[0], skip_special_tokens=True))

Streaming Inference

from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer
import torch
from threading import Thread

model = AutoModelForCausalLM.from_pretrained("Aquiles-ai/Athenea-4B-Thinking",
        dtype=torch.bfloat16,
        trust_remote_code=True,
        device_map="auto",
        attn_implementation="flash_attention_2")

tokenizer = AutoTokenizer.from_pretrained("Aquiles-ai/Athenea-4B-Thinking", trust_remote_code=True)

messages = [
    {"role": "user", "content": "Hey, explain the difference between artificial intelligence, machine learning, and deep learning."}
]

inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
).to('cuda')

# Create the streamer
streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True)

# Build kwargs for generate
generate_kwargs = dict(
    **inputs,
    max_new_tokens=8092,
    pad_token_id=tokenizer.eos_token_id,
    eos_token_id=tokenizer.eos_token_id,
    streamer=streamer,
)

def _generate_thread(model, kwargs):
    with torch.no_grad():
        model.generate(**kwargs)

thread = Thread(target=_generate_thread, args=(model, generate_kwargs))

thread.start()

for chunk in streamer:
    print(chunk, end="", flush=True)

Production Deployment with vLLM

Start server:

vllm serve Aquiles-ai/Athenea-4B-Thinking \
  --host 0.0.0.0 \
  --port 8000 \
  --api-key dummyapikey \
  --max-model-len=16384 \
  --async-scheduling \
  --gpu-memory-utilization=0.90

Request to the server from the OpenAI client:

from openai import OpenAI

client = OpenAI(api_key="dummyapikey", base_url="http://127.0.0.1:8000/v1")

stream = client.chat.completions.create(
    model="Aquiles-ai/Athenea-4B-Thinking",
    messages=[{
        "role": "user",
        "content": "Hey, tell me how a large language model like Llama or GPT is trained."
    }],
    max_tokens=8092,
    stream=True
)

for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="", flush=True)