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$ curl repovive.com/roadmaps/llm-fine-tuning/dataset-preparation-curation/chatml-format

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$ curl repovive.com/roadmaps/llm-fine-tuning/dataset-preparation-curation/chatml-format

Repovive

ChatML Format - Dataset Preparation & Curation | LLM Fine-Tuning | Repovive

Repovive.

LLM Fine-Tuning10 sections · 313 units1h total

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ChatML Format

ChatML uses explicit role markers:

<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How do I...?<|im_end|>
<|im_start|>assistant
Here's how...<|im_end|>

This format includes system prompts. Many modern models (Mistral, Qwen) expect ChatML. Check your base model's documentation for its preferred format.