Mistral Small 3
<s>[SYSTEM_PROMPT]You are a helpful assistant.[/SYSTEM_PROMPT][INST]Hello[/INST]Hello, how can I help you?</s>[INST]Tell me a fact[/INST]

R1
<｜begin▁of▁sentence｜><｜User｜>Hello<｜Assistant｜>Hello, how can I help you?<｜end▁of▁sentence｜><｜User｜>Tell me a fact<｜Assistant｜>

Llama 3.3
<|start_header_id|>system<|end_header_id|>You are a helpful assistant.<|eot_id|><|start_header_id|>user<|end_header_id|>Hello<|eot_id|><|start_header_id|>assistant<|end_header_id|>Hello, how can I help you?<|eot_id|><|start_header_id|>user<|end_header_id|>Tell me a fact<|eot_id|>

Gemma3
<start_of_turn>user
You are a helpful assistant.

Hello<end_of_turn>
<start_of_turn>model
Hello, how can I help you?<end_of_turn>
<start_of_turn>user
Tell me a fact<end_of_turn>
<start_of_turn>model
A fact<end_of_turn>