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Astral-1.5-4B

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Astral-1.5-4B
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---
datasets:
- LucidityAI/Astral-1.5-Post-Training-Dataset-SFT
- LucidityAI/Astral-1.5-Post-Training-Dataset-CRLFT
language:
- en
---

# Astral 1.5 4B

Astral 1.5 4B is a updated version of the Astral 4B model, trained for STEM tasks and agentic usage.
The model was trained on our Astral-1.5-Post-Training-SFT and Astral-1.5-Post-Training-CRLFT datasets.

## Comparisons

When asked for a TailwindCSS HTML page for a photo editing software models gave the following (zero-shot responses):

Qwen3 4B 2507 Thinking (8101 tokens used)
<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/QdZB10AELDKVN-N06hrvZ.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/wKgkEt9iUpCJFdnBIZ_Kr.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/MiYP2g38wdJjQZyDHSRtz.png" width="300" height="300" />

Astral 1.5 4B (6088 tokens used)
<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/zq-L7jDRhKAcuYQVn_KeQ.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/U9ZOEYv0EhsOxof1cTenC.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/4dzf12UFlQRGF_YTNasMc.png" width="300" height="300" />

GPT-5.2
<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/RI-hntpKSYXmZiPXN48q_.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/Kci7Xs9dFDz93P9ouxhLq.png" width="300" height="300" />

<img src="https://cdn-uploads.huggingface.co/production/uploads/650707344a8839a8bd85ae2f/FstCN0MeL7I6lFzgkKfVK.png" width="300" height="300" />

## Usage

You may utilize the following chat template to do regular chat completions with the model:

```
<|im_start|>user
What is the capital of France?
<|im_end|>
<|im_start|>assistant
<think>
CORRECT:
The
```

or to use it as an agent, you must prefill `<think>Agent mode is on</think>` like so:

```
<|im_start|>user
What is the capital of France?
<|im_end|>
<|im_start|>assistant
<think>
Agent mode is on
</think>

```