Run on your Mac

Run Outlier Lite on iMac M4

Last updated 2026-11-04

What does Outlier Lite run like on iMac M4?

The pairing under examination is Outlier Lite (5.04 GB MLX 4-bit, Qwen3.5-9B base, 8K context on Free (32K on Pro), 12 GB unified memory minimum) on an iMac M4 (Apple M4, 8-10 CPU cores, 8-10 GPU cores, 16, 24 or 32 GB unified memory, 120 GB/s, 2024). Outlier loads this tier as one mlx_lm process inside the bundled FastAPI sidecar. Apple Silicon decode on dense 4-bit weights is bandwidth-bound, so the figure on this exact iMac M4 scales roughly as the ratio 120 / 800 = 0.15× of the published M1 Ultra number.

Does iMac M4 hold that speed on a long job?

The iMac M4 is a desktop with active cooling, which is the configuration that comes closest to holding the figure above through a sustained back-and-forth session. There is no battery to trade against and no lap to keep cool, so the limit on Outlier Lite here is the 120 GB/s memory bus rather than the thermal envelope. This is the shape of machine to pick if the job runs unattended.

How much memory does the model take during generation?

The tier catalog lists a peak generation footprint of about 5.5 GB for Outlier Lite, 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 iMac M4 memory options that leaves 16 GB → 6.5 GB free; 24 GB → 14.5 GB free; 32 GB → 22.5 GB free. On iMac M4 the Outlier Lite bandwidth-scaled estimate is ~8.0 tok/s [estimated from family-bandwidth ratio]; derivation: 53.4 tok/s on M1 Ultra × (120 / 800) bus ratio for the Apple M4. Treat as a first-order projection, the Outlier Lite number on this 2024 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.

What is the install path on iMac M4 for Outlier Lite?

The 2024 iMac M4 ships with 16, 24 or 32 GB of unified memory. Headroom over the 12 GB Outlier Lite minimum is 4 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 5.04 GB pull from Outlier-Ai/Outlier-Lite-9B-MLX-4bit over HTTPS lands in ~/Library/Application Support/Outlier/models/lite/ and download time is bandwidth-limited by the network, not by the 8-10-core Apple M4 CPU.

What context window can I use on a 16 GB Mac?

The Outlier Lite tier runs at 8K context on Free; on Pro it defaults to 32K and caps at 128K. KV cache scales linearly with context length on dense models, so longer contexts trade headroom for capacity. On a 16 GB iMac M4, the default context is the safe starting point.

What works well on this pairing, and what is still rough?

• The Apple M4 (120 GB/s, 8-10 GPU cores) was current Apple Store silicon in 2025.
• The first launch of Outlier on an 8-10-core Apple M4 takes longer while the bundled Python.framework warms; later launches skip that step. I have not timed it.

What is the unique number for Outlier Lite on iMac M4?

5.04 GB on disk against the 16 GB iMac M4 (the smallest configuration that meets the 12 GB minimum) means the weights alone take about 32% of its memory.

Should I pick a different tier?

For lighter-weight work on this Apple M4, the Nano tier is the next step down and runs visibly faster. For heavier work, the Quick or 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 iMac M4 is 0.15× M1 Ultra reference.

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Free · M1 or newer · macOS 15+ (free update) · 276 MB. Intel Macs are not supported.