Which Mac should I buy for local AI?
Pick a memory tier first, then hunt for the cheapest Mac in that tier. For running AI models, how much memory a Mac has matters far more than how new it is.
Ground rules
- Memory is permanent. On Apple silicon Macs the RAM is part of the chip package. You can’t upgrade it later.
- Memory decides what runs; memory bandwidth decides how fast. Apple lists bandwidth on the spec page. Current examples: M5 MacBook Air 153GB/s, M6 Mac mini up to 170GB/s, M5 Pro 307GB/s, M5 Max up to 614GB/s, M5 Ultra 1.2TB/s. Pro, Max and Ultra chips generate text noticeably faster than base chips.
- Leave headroom. macOS and your other apps need memory too, and long conversations use extra memory on top of the model itself. Plan on the model using no more than about two-thirds to three-quarters of the Mac’s RAM.
- Storage is secondary. Models are big files (5–100GB+ each). 512GB is workable; 1TB is comfortable. An external SSD is a cheap way to store extra models.
- Any Apple silicon Mac (M1 or newer) works. Older Intel Macs are not a good choice for local AI.
16GB: the starter tier
Realistically runs: small models up to about 8–12B parameters at 4-bit (e.g. Gemma 4 E4B and 12B, Qwen3.5 9B, Liquid LFM2.5 models). Great for summarizing, rewriting, quick Q&A and learning how local AI works. Not enough for the best coding or reasoning models.
Macs to look for: base M6 Mac mini (16GB, Apple list price from $899 at launch), base M5 MacBook Air (16GB), or a used/refurbished M1–M4 Mac with 16GB. Avoid 8GB Macs for AI.
Typical cost: New: Mac mini M6 16GB $899 (Apple list); MacBook Air M5 13″ from $1,299 list, 15″ from $1,499 (Amazon had both $200 off in Oct 2026). Used: Mac mini M1/M2/M4 typical asking prices about $450–$790 (tracker medians across configs, Oct 2026). Check current price.
Value tip: 16GB is the cheapest way in, but if you’re buying specifically for AI, stretching to 24–32GB is usually the better buy. Check current price.
24–32GB: the sweet spot for most people
Realistically runs: mid-size models that feel genuinely useful: Qwen3.8 27B, Gemma 4 26B A4B, Liquid LFM2.5-24B-A2B, Mistral Small 3.2 24B. At 32GB you can also fit Gemma 4 31B and Qwen3.6 35B-A3B at 4-bit.
Macs to look for: M6 Mac mini upgraded to 24GB or 32GB (Apple charged $200 / $400 extra at launch); M5 MacBook Air with 24GB or 32GB; M5 Pro MacBook Pro or M5 Pro Mac mini (24GB base). Used: M2/M3 MacBook Air (up to 24GB), M4 MacBook Air or M4 Mac mini (up to 32GB), M1/M2 Pro MacBook Pro with 32GB.
Typical cost: New: Mac mini M6 24GB $1,099 / 32GB $1,299; Mac mini M5 Pro 24GB from $1,699; MacBook Pro 14″ M5 Pro 24GB from $2,199 (Apple list). Refurb/used: M4 Mac mini 24–32GB from roughly $830–$990 at third-party refurbishers. Supply of recent minis is tight, and some used units sell close to new. Check current price.
Value tip: a 32GB Mac mini is one of the cheapest “serious” local-AI machines. Check current price.
48–64GB: the enthusiast tier
Realistically runs: the same 24–35B models at higher quality (8-bit) with room for long documents, or a chat model plus a coding model at the same time. Also some larger mixture-of-experts models with aggressive compression.
Macs to look for: M5 Pro Mac mini with 48GB or 64GB; M5 Max Mac Studio (48GB or 64GB); M5 Pro/Max MacBook Pro with 48–64GB. Used: M1 Max or M2 Max MacBook Pro / Mac Studio with 64GB, M4 Pro Mac mini with 48–64GB. Used M1/M2 Max machines often have strong memory bandwidth for the money.
Typical cost: New: Mac mini M5 Pro 48GB from $2,299 / 64GB from $2,699; Mac Studio M5 Max 48GB $3,099 / 64GB $3,499 (Apple list). Used: M1 Max Mac Studio 64GB about $1,250–$2,200; M4 Pro Mac mini median ask about $1,675; M4 Max Mac Studio 64GB about $2,400–$2,700. Check current price.
Used Max-chip machines vary widely by storage and condition.
96–128GB: the “big model” tier
Realistically runs: large mixture-of-experts models around 100–125B total parameters at 4-bit, such as Qwen3.5 122B-A10B, Mistral Small 4 (119B) and Llama 4 Scout (109B), plus compressed versions of Qwen3.8-Flash-Next. Mid-size models run at full 8-bit or 16-bit quality.
Macs to look for: M5 Max Mac Studio with 128GB; M5 Ultra Mac Studio (96GB base); M5 Max MacBook Pro with 128GB. Used: M2 Max (up to 96GB), M3 Max or M4 Max (up to 128GB), M1 Ultra (up to 128GB), M2 Ultra 128GB, M3 Ultra 96GB.
Typical cost: New: Mac Studio M5 Max 128GB $5,099; Mac Studio M5 Ultra 96GB from $5,499 (Apple list). Refurb/used: M1 Ultra 128GB about $2,400–$2,900; M3 Ultra 96GB about $3,400–$4,500 (Apple Refurbished lists it at $4,329 when in stock); M4 Max 128GB $4,159 at Apple Refurbished when in stock, about $4,900 via eBay Refurbished. Check current price.
192–256GB: the “very big model” tier
Realistically runs: very large mixture-of-experts models in the 280–400B range. At 256GB: GLM-5.3-Flash (~320B) and DeepSeek V4-Flash (284B) at 4-bit, and Llama 4 Maverick (400B) tightly. At 192GB, those same models generally need heavier ~3-bit compression, which costs some quality. Also lets you keep a 100B+ model loaded at 8-bit.
Macs that reach it: only Ultra chips. New: M5 Ultra Mac Studio with 256GB (Apple skips straight from 96GB to 256GB; there’s no 192GB option). No M5 Max, MacBook Pro or Mac mini goes above 128GB. Used/refurbished: M2 Ultra Mac Studio or Mac Pro with 192GB, and M3 Ultra Mac Studio with 256GB.
Typical cost: New: Mac Studio M5 Ultra 256GB from $9,499 (1TB; Apple list). Used M2 Ultra 192GB Mac Studio: about $3,700–$5,950 in recent Swappa and eBay sales. Used M3 Ultra 256GB: about $6,700–$9,800 in Sep–Oct 2026 sales; eBay Refurbished from about $8,100. Apple Refurbished has listed M3 Ultra 256GB at $7,729–$10,279 and M2 Ultra 192GB at $7,519+, but none were in stock on Oct 17, 2026. Check current price.
Value tip: a new M5 Ultra 256GB costs about the same as many used M3 Ultra 256GB listings, and comes with a warranty and faster memory (1.2TB/s vs 819GB/s). The used M2 Ultra 192GB is the cheapest way past 128GB.
512GB and beyond
Realistically runs: the biggest models that fit on one Mac, tightly: GLM-5.3 (744B) and DeepSeek V4.1-Flash with aggressive compression. Frontier models like Meta Muse Spark Open (816B) need two or more Mac Studios linked over Thunderbolt 5.
Macs to look for: M5 Ultra Mac Studio with 512GB (Apple says it’s coming late October 2026), or a used M3 Ultra Mac Studio with 512GB (rare).
Typical cost: New 512GB M5 Ultra: price not listed when we checked. Used M3 Ultra 512GB: rare; one Swappa sale seen at $23,174 (8TB). Check current price.
Where to look for deals
Plain retailer links for now. We don’t track live prices yet, so always compare before you buy.
Apple Certified Refurbished
Apple-inspected Macs with a new outer shell and battery, Apple’s standard one-year warranty and AppleCare eligibility. Stock changes daily, and high-memory configs sell fast.
Amazon
Frequent discounts on new Macs, plus “Renewed” (refurbished) listings. Check who the seller is and the return window.
Best Buy open-box
Returned items graded by condition, often with the full manufacturer warranty. Good for finding upgraded memory configs at a discount.
eBay
Widest selection of older high-memory Macs (Max and Ultra chips). Check seller ratings and the “eBay Refurbished” badge, and confirm the exact memory in the listing.
Swappa
A marketplace for used devices where listings are reviewed before going live. Often good prices on used MacBooks and Mac minis.
Used-Mac checklist
- Confirm the exact memory (Apple menu → About This Mac). Listings are often wrong.
- Make sure Activation Lock is off and the seller has signed out of their Apple Account.
- For laptops, check battery cycle count and health (System Settings → Battery).
- Check the return window and warranty before paying.
- Compare against the Apple Refurbished price for the same config. Sometimes refurbished with a warranty is the better deal.
Mac deal alerts for local AI
Get a short email when a refurbished or open-box Mac with lots of memory drops in price, plus new open models that fit on a Mac.