horizon-edge-4b

Horizon Edge 4B — On-Device Child Safety Risk Detection

Horizon Edge 4B is a fine-tuned Gemma 4 E4B model packaged in LiteRT-LM format. It delivers higher accuracy than Horizon Edge 2B at a moderate size increase (~3.7 GB), making it the recommended edge choice for devices with 6 GB+ RAM.

⚠️ License: SafeCircle Research License (SRL-1.0). Commercial use prohibited without written permission. Contact [email protected].

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Available Variants

All variants share the same fine-tuned weights; they differ only in hardware-specific compilation.

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Model Details

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Risk Categories

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Usage

LiteRT-LM CLI

uv tool install litert-lm

litert-lm run horizon-edge-e4b.litertlm \
    --prompt "Analyze this conversation: Child: hey, want to meet up? Don't tell your parents."

Android / iOS — LiteRT-LM SDK

Load the .litertlm file with the LiteRT-LM SDK. The model includes the tokenizer, system prompt, and chat template — no additional configuration required.

Python

from litert_lm import LiteRTLM

model = LiteRTLM("horizon-edge-e4b.litertlm")
result = model.generate(
    "Analyze this conversation:\nChild: hey\nOther: how old are you? where do you live?"
)
print(result)

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Deployment Pattern

Incoming message
      │
      ▼
Horizon Edge 4B (on-device, LiteRT-LM)
      │
      ├── safe ──► No action
      │
      └── risk ──► Horizon Full (cloud API, full severity assessment)
                        │
                        ▼
                  Human moderator review

For the full server-side model, see safecircleai/horizon-full. For the smaller 2B variant, see safecircleai/horizon-edge-2b.

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Citation

@misc{horizon2026,
  title={Horizon: Child Safety Risk Detection via Fine-tuned LLMs},
  author={SafeCircle},
  year={2026},
  url={https://huggingface.co/safecircleai/horizon-edge-4b}
}