Raw Text Early Models (before 2022)
Translate to French:
Hello world
 Evolution Chat Templates (in JSON) Chat Models (2022-2025)
{
"role": "system",
"content": "You are..."
},
{
"role": "user",
"content": "Hello"
}
 Evolution JSON + XML Reasoning Models (2025+)
{
"role": "assistant",
"content": [
<thinking>
reasoning...
</thinking>
<output>
response
</output>
]
}
 • Simple prompts • Generally no structure • Completion-based • Role separation • Chat/Turn-based • Chat/Turn-based with added tags for control Before 2022 2022-2025 2025+