Astral-4B

Astral 4B is the medium sized model in the Astral family. It was fine-tuned from Qwen3 4b on LucidityAI/Astral-Post-Training-Dataset.

As with usual Qwen3 models, reasoning can be toggled through the usage of /no_think or not.

Example Prompt (ChatML Format (THINKING)):

<|im_start|>user
What is the capital of France?
<|im_end|>
<|im_start|>assistant
<think>

Example Prompt (ChatML Format (NON-THINKING)):

<|im_start|>user
What is the capital of France? /no_think
<|im_end|>
<|im_start|>assistant
<think>

Base model