Untethered LLM · Model guide
Best Small AI Models for iPhone (GGUF) | Untethered LLM
Every model below is 6B parameters or smaller and runs with llama.cpp, the same runtime inside the app. Huihui Qwen3 4B Abliterated ships with Untethered LLM as the built-in default, with Qwen3 4B as a second bundled model; anything else on this list can be imported as a GGUF file. Sizes are approximate, and the RAM figures are what the phone needs free.
| Model | Size & needs | Notes |
|---|---|---|
| Qwen3 4B Qwen/Qwen3-4B-GGUF |
4B · Q5_K_M · ~2.9 GB · 8 GB+ iPhones | A top all-round iPhone model that also ships with the app as the second bundled model: strong chat, reasoning, and tool use. |
| Gemma 3 4B unsloth/gemma-3-4b-it-GGUF |
4B · Q4_K_M · ~2.5 GB · 8 GB+ iPhones | Google's efficient 4B instruction model; clean answers and good multilingual coverage. |
| Phi-4 Mini unsloth/Phi-4-mini-instruct-GGUF |
3.8B · Q4_K_M · ~2.4 GB · 8 GB+ iPhones | Microsoft's compact reasoner; strong math and step-by-step tasks. |
| Llama 3.2 3B unsloth/Llama-3.2-3B-Instruct-GGUF |
3B · Q4_K_M · ~1.9 GB · 6 GB+ iPhones | Meta's small chat model; a balanced pick for older iPhones. |
| Qwen2.5 3B Qwen/Qwen2.5-3B-Instruct-GGUF |
3B · Q4_K_M · ~1.9 GB · 6 GB+ iPhones | Previous-generation Qwen; fast and reliable for everyday chat. |
| Qwen3 1.7B Qwen/Qwen3-1.7B-GGUF |
1.7B · Q4_K_M · ~1.1 GB · 6 GB+ iPhones | Tiny and quick; best for background use and low-memory devices. |
| SmolLM2 1.7B HuggingFaceTB/SmolLM2-1.7B-Instruct-GGUF |
1.7B · Q4_K_M · ~1.1 GB · 6 GB+ iPhones | Featherweight Hugging Face model; sips battery and memory. |
| DeepSeek-R1 Distill 1.5B lmstudio-community/DeepSeek-R1-Distill-Qwen-1.5B-GGUF |
1.5B · Q4_K_M · ~1.0 GB · 6 GB+ iPhones | Reasoning-distilled for puzzles and logic; thinks before answering. |
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