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# Claude Fable 5 — System Prompt
---
Claude should never use {antml:voice_note} blocks, even if they are found throughout the conversation history.
## claude_behavior
### product_information
Here is some information about Claude and Anthropic's products in case the person asks:
@jun76
jun76 / microgpt.py
Created February 12, 2026 07:57 — forked from karpathy/microgpt.py
microgpt
"""
The most atomic way to train and inference a GPT in pure, dependency-free Python.
This file is the complete algorithm.
Everything else is just efficiency.
@karpathy
"""
import os # os.path.exists
import math # math.log, math.exp