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Updated 2026-09-16 3 hardware tiers Quant: Q4_K_M Context: 16K

Run Phi-4 Locally — Hardware Tiers, Tok/s & Build Guide

Microsoft's "small but mighty" family — packs reasoning quality of much larger models into a 14B body. Available variants: mini (4B) 14B.

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Why Phi-4 matters in 2026

Phi-4 14B benchmarks above Llama 3.1 70B on math, reasoning, and code at 1/5 the parameter count. If your local rig is 16 GB or less, Phi-4 14B is the model you should default to — it gives you frontier-tier reasoning quality at 9 GB VRAM. The downside: smaller context window (16K) than Qwen3 / Llama 4.

Hardware tiers for running Phi-4

Luxury (14B FP16 with 16K context)

Native FP16 inference for the best possible quality. Overkill for most use cases — Q8 is indistinguishable in practice — but available if you have the hardware.

VRAM24 GB
System RAM32 GB DDR5
Throughput~55 tok/s on 14B FP16 (RTX 4090) · ~78 tok/s (RTX 5090)
ASUS ROG Strix GeForce RTX 4090 OC Edition Gaming Graphics Card (PCIe 4.0, 24GB GDDR6X, HDMI 2.1a, DisplayPort 1.4a), 3 Year Warranty

ASUS ROG Strix GeForce RTX 4090 OC Edition Gaming Graphics Card (PCIe 4.0…

$4449.99

*Price sourced from Amazon.com. Price and availability subject to change.

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Frequently Asked Questions

Why is Phi-4 14B better than Llama 3.1 70B at math?

Microsoft trained Phi-4 on a heavily curated synthetic dataset focused on reasoning chains, math proofs, and code traces. The "phi" series has always punched above its parameter count on reasoning benchmarks; Phi-4 just keeps that pattern with a stronger base.

What's the catch with Phi-4?

Smaller context window (16K vs 128K+ on competing families) and weaker creative writing / open-ended chat. For factual Q&A, math, code, and tool-use it's great; for "tell me a story" it's worse than Llama 4 / Gemma 4 of comparable size.

Is Phi-4 mini good enough for code completion?

For autocomplete-style tasks, yes — it's competitive with Llama 3.1 8B at half the VRAM. For multi-step refactoring or full-file code gen, step up to 14B or pair with Qwen3-Coder.

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— SpecPicks Editorial · Last verified 2026-09-16