jc-builds / Phi-4-mini-instruct-GGUF

Phi-4-mini-instruct — GGUF (iPhone-optimized)

GGUF quantizations of microsoft/Phi-4-mini-instruct , built and optimized for on-device inference on iPhone, iPad, and Apple Silicon Macs via llama.cpp or apps that wrap it (e.g. Haplo ).

Built and quantized by jc-builds for the Haplo ecosystem. Original weights © Microsoft Corporation, redistributed under the MIT License per the upstream license.

TL;DR

A 3.8B-parameter reasoning-focused model from Microsoft. Punches well above its weight on math, code, and structured-reasoning benchmarks — beating models 5–10× its size on MATH and GPQA. 128k context with YaRN. MIT-licensed, the most permissive license among comparable models. Best small-model pick if you want "thinking mode" without paying the latency tax of a 7B+ model.

Available quantizations

Pick Q4_K_M for general use. Phi-4-mini's reasoning quality holds up well at Q4_K_M. Avoid Q3 quants for this model — reasoning quality degrades noticeably.

Performance on Apple Silicon

Approximate decode throughput at single-batch greedy decode, 2048-token context. Measured with llama-cli .

Reference numbers — Q5_K_M and Q8_0 are roughly 15% / 40% slower than Q4_K_M.

How to use

1. Haplo (iPhone / iPad / Mac)

The model appears automatically in Haplo's model browser on Kuzco-1.1.0+ builds. The download URL for Q4_K_M is:

https://huggingface.co/jc-builds/Phi-4-mini-instruct-GGUF/resolve/main/Phi-4-mini-instruct-Q4_K_M.gguf

2. llama.cpp (CLI)

huggingface-cli download jc-builds/Phi-4-mini-instruct-GGUF Phi-4-mini-instruct-Q4_K_M.gguf --local-dir .

./llama-cli \
  -m Phi-4-mini-instruct-Q4_K_M.gguf \
  -p "If x^2 + 3x - 10 = 0, find x." \
  -n 512 \
  --temp 0.0

For reasoning-heavy tasks set --temp 0.0 and let the model deterministically work through the problem.

3. Ollama

cat <<'EOF' > Modelfile
FROM ./Phi-4-mini-instruct-Q4_K_M.gguf
PARAMETER temperature 0.0
PARAMETER top_p 1.0
EOF
ollama create phi-4-mini -f Modelfile
ollama run phi-4-mini

Long context (128k via YaRN)

Phi-4-mini is trained at 64k context and can stretch to 128k tokens via YaRN extrapolation. To enable: most clients pick this up automatically from the GGUF metadata. If yours doesn't, set --rope-scaling yarn --rope-scale 2.0 in llama.cpp.

Sampling defaults

For reasoning tasks (math, code, structured output): temperature=0.0 , top_p=1.0 . For chat / general output: temperature=0.7 , top_p=0.9 .

The GGUF stores no defaults — pass them explicitly per task.

Chat template

Phi-4-mini uses the Phi-3 chat template. The tokenizer stores it in the GGUF metadata, so llama.cpp's --chat-template flag isn't required.

<|system|>
{system}<|end|>
<|user|>
{user}<|end|>
<|assistant|>
{assistant}<|end|>

Quantization recipe

Built with llama.cpp at commit e43431b (May 7, 2026).

1. Downloaded microsoft/Phi-4-mini-instruct safetensors checkpoint via huggingface-cli .
2. Converted to GGUF FP16 via convert_hf_to_gguf.py --outtype f16 (Phi-4 reuses the Phi-3 architecture path in convert).
3. Quantized to each target type via llama-quantize :

   llama-quantize Phi-4-mini-F16.gguf Phi-4-mini-instruct-Q4_K_M.gguf Q4_K_M
   llama-quantize Phi-4-mini-F16.gguf Phi-4-mini-instruct-Q5_K_M.gguf Q5_K_M
   llama-quantize Phi-4-mini-F16.gguf Phi-4-mini-instruct-Q8_0.gguf   Q8_0
   

No imatrix calibration was used — the weights come from the upstream FP16 directly.

Original model card

See the upstream model card for full architecture, training, benchmarks, and Microsoft's responsible-AI guidance: microsoft/Phi-4-mini-instruct .

License

MIT License , inherited from the original model — the most permissive license among comparable on-device models. Commercial use, modification, redistribution, and bundling in proprietary apps are all permitted with attribution. See LICENSE for full terms.

Phi-4-mini by Microsoft Corporation. Licensed under the MIT License.

Acknowledgements

• Microsoft for the original Phi-4-mini weights and an unusually open-licensed release.
• The llama.cpp team for the GGUF format and quantization tooling.
• The Haplo ecosystem this drop is built for.