/Tech29d ago

A developer fine-tunes DistilBERT model for prompt injection detection on DeepSeek V4 Flash via OpenRouter for under one dollar

Model hosted on Hugging Face after 306 requests and 19.6 million tokens.

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Lewis Tunstall#1719

Everlier@Everlier

Fine-tuned a distilbert with ml-intern today for the first time.

The procedure is really straightforward, almost unexpectedly so. - Found a few datasets relevant to the task (prompt injection detection) - Experimented a bit with few different models - Did a sample training run to validate the params - Did a full run afterwards

All via DeepSeek v4 Flash from OpenRouter for <$1. Working on an HRM/recursive version now.

https://huggingface.co/av-codes/pi-detector-distilbert

10:28 AM · May 20, 2026 · 19.5K Views

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Everlier@Everlier

Fine-tuned a distilbert with ml-intern today for the first time.

All via DeepSeek v4 Flash from OpenRouter for <$1. Working on an HRM/recursive version now.

https://huggingface.co/av-codes/pi-detector-distilbert

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