Format

{"system": "You are Marv, a helpful support assistant.",
 "messages": [
   {"role": "user", "content": "How do I reset my password?"},
   {"role": "assistant", "content": "Go to Settings → Security → Reset Password..."}
 ]}
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Key differences from OpenAI

System prompt separate top-level field. No weight parameter. Multi-turn assistants may need explicit interleave.

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Recommended sizes

Anthropic docs: 100-10k examples typical. 1000+ for reliable behavioral shift. Under 100 mostly cosmetic.