Can I Run LFM2.5 on MacBook Air (M4, 16 GB)?

Written by Jakub Rusinowski · Last updated October 15, 2026

Yes

Yes — LFM2.5-8B-A1B at Q8_0 needs about 10.8 GB of the 12 GB usable on MacBook Air (M4, 16 GB) (~1.2 GB spare), at ~27.7 tok/s (estimated), with room for about 16,384 tokens of context.

Confidence: medium · Recommended quantization: Q8_0 · Estimated speed: ~27.7 tok/s

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MacBook Air (M4, 16 GB) — what it gives a model

Usable memory for models	12 GB
Memory bandwidth	120 GB/s
Form factor	Laptop
Operating system	macOS
Memory upgradeable	No — soldered

LFM2.5 on MacBook Air (M4, 16 GB): memory by quantization

Quant	Memory needed	Fits 12 GB?	Max context	Est. speed	Download
F16	18.6 GB	✗ No	—	—	16.6 GB
Q8_0	10.8 GB	✓ Yes	16K	~27.7 tok/s	8.8 GB
Q6_K	8.8 GB	✓ Yes	16K	~32.6 tok/s	6.8 GB
Q5_K_M	7.9 GB	✓ Yes	32K	~35.6 tok/s	5.9 GB
Q4_K_M	7 GB	✓ Yes	32K	~38.9 tok/s	5 GB
Q3_K_M	5.5 GB	✓ Yes	32K	~46.2 tok/s	3.5 GB
Q2_K	4.7 GB	✓ Yes	32K	~51.5 tok/s	2.7 GB

Which LFM2.5 sizes fit

Variant	Needs at Q4_K_M	Fits?	Est. speed
LFM2.5-24B-A2B	15.5 GB	✗ Too large	—
LFM2.5-8B-A1B	7 GB	✓ Fits	~38.9 tok/s
LFM2.5 2.6B	3.2 GB	✓ Fits	~29.6 tok/s

What to watch out for

Only ~1.2 GB of headroom at Q8_0: a longer context or a second application can push this into swapping.
1 larger variant of LFM2.5 does not fit and would need CPU offload or different hardware.
This model does not publish its full attention configuration, so the KV-cache share of these figures is inferred from its parameter count rather than computed exactly.
Memory on this machine is not upgradeable, so the configuration you buy is the ceiling for every model you will ever run on it.

MacBook Air M4 16 GB limitations

Fanless: sustained generation throttles on long runs in a way the same chip in a MacBook Pro does not.
16 GB unified memory is shared with the OS and every open app.

Recommended setup

Ollama or LM Studio (Metal) — MLX for the fastest Apple-native throughput

How these numbers are calculated

Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
16 GB unified memory at 120 GB/s, shared between CPU and GPU.
macOS reserves a share of unified memory for the system, so not all of it is available to a model.
Throughput is a memory-bandwidth roofline estimate, not a measurement. It is labelled "estimated" everywhere it appears.
KV cache is inferred from the parameter count because this model does not publish its full attention configuration.

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