Outlier Quick on MacBook Air 15 M4: loads on the base SKU but needs a higher-RAM SKU to run fully in memory. Minimum unified memory required: 16 GB. Disk size: 15.61 GB. Default context window: 32K tokens. On MacBook Air 15 M4 the Outlier Quick bandwidth-scaled estimate is ~6.5 tok/s [estimated from family-bandwidth ratio]; derivation: 43.6 tok/s on M1 Ultra × (120 / 800) bus ratio for the Apple M4. Treat as a first-order projection, the Outlier Quick number on this 2025 machine has not been formally measured. The only real check of this method, Nano on a 16 GB M4 Air, ran about 3× faster than the 10.8 tok/s it projects, so read the figure as conservative.
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The pairing under examination is Outlier Quick (15.61 GB MLX 4-bit, Gemma-4-26B-a4b-it base, 32K default context, 16 GB unified memory minimum) on a MacBook Air 15 M4 (Apple M4, 10 CPU cores, 10 GPU cores, 16, 24 or 32 GB unified memory, 120 GB/s, 2025). Outlier loads this tier as one mlx_lm process inside the bundled FastAPI sidecar. Outlier Quick is a mixture-of-experts model, and we project its speed on this exact MacBook Air 15 M4 with the bandwidth ratio 120 / 800 = 0.15× of the M1 Ultra number, a first-order proxy only.
The MacBook Air 15 M4 is fanless. The figure above is a burst ceiling, and burst is not what a sustained back-and-forth session asks for: decoding Outlier Quick keeps the GPU busy continuously, the chassis is the only heatsink, and the SoC down-clocks once it saturates. Expect the first minutes to look like the number above and a long job to settle below it. On battery it settles lower again. Direction verified, magnitude not measured on this machine: we publish the mechanism rather than a throttle figure we have not reproduced.
The tier catalog lists a peak generation footprint of about 16 GB for Outlier Quick, for a short chat; a long agent session needs more. The rule of thumb is to leave roughly 4 GB for the OS and one open browser tab, so across the MacBook Air 15 M4 memory options that leaves 16 GB → 4.0 GB short; 24 GB → 4.0 GB free; 32 GB → 12.0 GB free. On MacBook Air 15 M4 the Outlier Quick bandwidth-scaled estimate is ~6.5 tok/s [estimated from family-bandwidth ratio]; derivation: 43.6 tok/s on M1 Ultra × (120 / 800) bus ratio for the Apple M4. Treat as a first-order projection, the Outlier Quick number on this 2025 machine has not been formally measured. The only real check of this method, Nano on a 16 GB M4 Air, ran about 3× faster than the 10.8 tok/s it projects, so read the figure as conservative.
The 2025 MacBook Air 15 M4 ships with 16, 24 or 32 GB of unified memory. Headroom over the 16 GB Outlier Quick minimum is 0 GB on the 16 GB base model. Step-by-step install instructions live on the install guide; the part that varies for this Apple M4 machine is that the 15.61 GB pull from Outlier-Ai/Outlier-Quick-26B-MLX-4bit over HTTPS lands in ~/Library/Application Support/Outlier/models/quick/ and download time is bandwidth-limited by the network, not by the 10-core Apple M4 CPU.
The Outlier Quick tier defaults to 32K context and caps at 128K on Pro. KV cache scales linearly with context length on dense models, so longer contexts trade headroom for capacity. On a 16 GB MacBook Air 15 M4, the default context is the safe starting point.
15.61 GB on disk against the 16 GB MacBook Air 15 M4 (the smallest configuration that meets the 16 GB minimum) means the weights alone take about 98% of its memory.
For lighter-weight work on this Apple M4, the Lite tier is the next step down and runs visibly faster. For heavier work, the Core tier is the next step up; check that the memory configuration you have (16, 24 or 32 GB on this Mac) can fit its weights before installing. The unified-memory explainer works the bandwidth math out, and the bandwidth ratio for MacBook Air 15 M4 is 0.15× M1 Ultra reference.
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