Best Local AI Models for iMac

Configure your iMac

Apple prices · checked 2026-10-27 ·

01

Chip.

02

Processing power.

+$200 for the 12-core GPU at 16 GB: same generation speed (both 153 GB/s), prompt reading about 20% faster.

Qwen3.5 9B Instruct · estimated speeds · Prompt-speed source

03

Memory.

04

Storage.

Inside the MacApple list price

Outside the MacAmazon kit · enclosure + drive

Your top 10 models need about 65 GB. 1TB holds them 15 times over.

  • EnclosureUGREEN USB4 NVMe enclosureUSB4, 40Gb/s · ASM2464PD · aluminum fins · M.2 2280 up to 8TB
    Amazon
  • DriveSamsung 990 PRO 1TBPCIe 4.0 NVMe · M.2 2280 · no heatsink, fits the enclosure
    Amazon
Add both to Amazon cart

40Gb/s USB4 enclosure.

Storage does not change model speed.

Keep Ollama's models on the drive
Name the drive Models, run this, then restart Ollama:launchctl setenv OLLAMA_MODELS "/Volumes/Models/ollama"Ollama FAQ

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05

Model filters.

Use case
Min speed
Must run

Best models for iMac M6 · 16 GB

20 models · all uses · any speed · estimated speeds

Context
Runtime
Qwen3.5 9B Instruct 7.0 GB + 0.3 GB KV of 11.2 GB usable 3.9 GB free at 8k
ModelQuantFitRun
1est. 28 tok/s · Runs well9B7.0 GBRuns well24.228
2est. 53 tok/s · Runs well12.1B moe 2.5BQ4_K_M8.1 GBRuns welln/a53llama-server -hf, via llama.cpp
3est. 35 tok/s · Runs well4BQ4_K_M7.9 GBRuns welln/a35
4est. 18 tok/s · Runs well12BQ4_K_M8.0 GBRuns well21.618
5est. 27 tok/s · Runs well9BQ4_K_M5.8 GBRuns welln/a27llama-server -hf, via llama.cpp
6est. 28 tok/s · Runs well9BQ4_K_M5.6 GBRuns welln/a28
7est. 79 tok/s · Runs well8.3B moe 1.5BQ4_K_M5.5 GBRuns welln/a79
8est. 49 tok/s · Lots of room4B3.5 GBLots of room19.049
9est. 20 tok/s · Runs well8.8BQ4_K_M6.4 GBRuns welln/a20llama-server -hf, via llama.cpp
10est. 28 tok/s · Runs well4.5B7.5 GBRuns well13.328
11est. 23 tok/s · Runs well8.4BQ4_K_M6.0 GBRuns well7.323
12est. 15 tok/s · Runs well13.5BQ4_K_M9.1 GBRuns well9.815
13est. 27 tok/s · Runs well8.7BQ4_K_M5.7 GBRuns welln/a27
14est. 27 tok/s · Runs well8B6.5 GBRuns well-3.127
15est. 24 tok/s · Runs well8.8BQ4_K_M5.0 GBRuns well19.324
16est. 64 tok/s · Runs well2.3B4.6 GBRuns well6.364
17est. 26 tok/s · Runs well8B6.5 GBRuns welln/a26
18est. 65 tok/s · Lots of room2BQ4_K_M1.8 GBLots of room3.365
19est. 18 tok/s · Runs well7B7.5 GBRuns well7.918
20est. 30 tok/s · Runs well7BQ4_K_M5.5 GBRuns well-3.630

Select a row to update the summaryMemory includes 8k contextEstimated speeds · verified run commandsQuality: LLM Stats Score · Data by LLM Stats

See how fast it feels

Qwen3.5 9B Instruct: ~1.2s to start, then est. 28 tok/s, typical error 10%.

zsh · ollama run qwen3.5:9best. 28 tok/s

~ $ ollama run qwen3.5:9b

# Press Send to run the fixed message below.

# fixed message, the same for every model

>>> Summarize these meeting notes in one short paragraph: what was decided, and who does what next.

[meeting-notes.txt]
Weekly sync, support tools team
Attendees: Maya (lead), Jonas, Priya, Tom, Elena
Agenda: local drafting assistant pilot, knowledge base cleanup, customer feedback survey, on-call rota, next steps

1. Local drafting assistant pilot
- Maya recapped the goal: agents draft replies with an assistant that runs on the team's own Macs, so customer emails never leave the building and nothing depends on an outside service being up.
- Jonas ran the pilot for two weeks on four machines. Agents used it for first drafts on roughly a third of tickets. Most drafts needed light edits. A few needed a full rewrite, mostly billing questions where the model guessed at policy instead of saying it did not know.
- Priya said the biggest complaint was the wait before the first word on long tickets. Short tickets felt instant. Tickets with a long email thread pasted in took several seconds before anything appeared, and agents read that as the tool being stuck. Two agents restarted the app because of it.
- Tom suggested trimming the thread to the last three messages before sending it to the model. Elena worried that would drop context the customer refers back to, like an order number from the first email. Agreed to test both on the same set of tickets before choosing.
- Jonas said the speed once the reply starts was fine on every machine. Agents read slower than the model writes, so nobody asked for faster output. The only request was a visible sign that the model is reading, so people stop restarting it.
- Memory: the oldest machine, the one with the least memory, could not keep the model loaded next to the browser and the ticketing app. It swapped and slowed down badly by mid-morning. The other three machines had no issue all day.
- Priya asked whether a larger model would fix the billing guesses. Jonas thought not: the model guesses because the policy text it needs is missing or contradictory, and a bigger model would guess more fluently, not less.
- Decision: keep the current model size for now. Revisit only after the knowledge base cleanup, and only if the edit rate on billing drafts is still high.

2. Knowledge base cleanup
- Elena found about forty articles that contradict each other on refund windows and plan changes. These are the likely source of the billing guesses.
- Priya proposed one owner per section, with a review date on every article so stale pages show up on their own instead of during an angry ticket.
- Agreed: Elena owns billing and refunds, Priya owns accounts and login, Tom owns shipping and returns. Each owner archives duplicates, merges the rest, and flags anything that needs a policy decision from Maya.
- Jonas will add the cleaned articles to the assistant's reference folder once each section is signed off, not before. Mixing old and new versions would make the guessing worse.
- Tom asked for a template for new articles. Elena will share the one billing already uses.

3. Customer feedback survey
- Priya shared the quarterly survey results. Response time scores went up since the last quarter, and the free-text comments mention faster first replies more than once.
- Several comments still complain about being asked for the same order details twice. Elena thinks this happens when a ticket moves between agents and the notes field is left empty.
- Agreed: the handover checklist gets one new line, fill in the notes field before reassigning a ticket. Tom will update the checklist and post it in the team channel.
- Maya wants the next survey to ask one question about reply quality, not only speed, so the team can see whether the assistant drafts change how customers rate answers.

4. On-call rota
- Two people asked to swap weeks in November. Maya approved both swaps.
- Tom raised that weekend coverage gets thin when two people are on leave at the same time. Agreed that leave requests go in the team channel at least two weeks ahead, and Maya checks the rota before approving.
- No change to escalation rules. The escalation doc is still correct.

5. Next steps
- Jonas: run the trimmed thread versus full thread test on fifty past tickets and report the wait before the first word and the edit rate for each.
- Jonas: add a reading indicator to the assistant panel so agents can see the model is working on a long ticket.
- Elena, Priya, Tom: finish their knowledge base sections and send Maya the open policy questions.
- Maya: ask IT whether the oldest machine can get more memory or should be replaced at the next refresh.
- Everyone: log any draft that invents a policy, with the ticket link, in the shared sheet.
- Next sync: same time next week. Maya sends the agenda the day before.

Estimated speed, not a benchmark. Model loading excluded.

Compare configurations

Full comparison
SpecA · yoursBChange
ConfigurationM6 12C · 16 GBM6 12C · 24 GB
Apple list price, base storage$1,699$1,899+$200
Bandwidth153 GB/s170 GB/s+17 GB/s
Usable memory11.2 GB16.8 GB+5.6 GB
Models at 8k5470+16
Top pickQwen3.5 9B Instruct
est. 28 tok/s
LFM2 24B-A2B Instruct
est. 66 tok/s
Max context~134k125k, max
B runs 12 models that A cannot at 8k
Qwen3.5 27B Instruct27Best. 10 tok/s
Gemma 4 26B-A4B26Best. 38 tok/s
LFM2 24B-A2B Instruct24Best. 66 tok/s
Devstral Small 2 24B24Best. 10 tok/s
Mistral Small 3.124Best. 10 tok/s
GPT-OSS 20B21Best. 38 tok/s
Qwen3 14B14Best. 17 tok/s
Phi-4 14B14Best. 16 tok/s
Qwen2.5 Coder 14B14Best. 17 tok/s
DeepSeek-R1 Distill Qwen 14B14Best. 17 tok/s
and 2 more

The 24-inch iMac runs local AI on the same base chips as the Mac mini, with 8GB to 32GB of unified memory. The 2026 M6 iMac reaches up to 170 GB/s memory bandwidth, enough for 9B-14B class models at everyday speeds on 24GB and 32GB configs; 8GB M1 and M3 units stay with 4B-class models.

Quick answer

On a iMac, the best local LLM ranges from Qwen3.5 4B Instruct at 8GB to Gemma 4 26B-A4B at 32GB. That spans 8GB to 32GB configurations, where 90 of ModelFit's 129 local models fit comfortably at the top tier. Set your exact chip and memory in the configurator above for its ranked list.

Sizing rule: a local model needs about 0.6 GB of unified memory per billion parameters at Q4, and ModelFit budgets roughly 70% of each configuration's RAM. At 8GB the best fit is Qwen3.5 4B Instruct (~3.5GB); at 32GB it is Gemma 4 26B-A4B (~16GB), reaching est. 38 tok/s, typical error 10%. Mid-range configurations trade model size for speed between those two points. What it will not run: even the 32GB tier leaves Gemma 4 26B-A4B (Q8) (26B) to a cloud API, and the 8GB tier caps out far earlier.

→ Set your exact chip and memory in the configurator above for its ranked models and one-line install command.

Entry (M1, 8GB)
Qwen3.5 4B Instruct
Top (M6, 32GB)
Gemma 4 26B-A4B
Decode speed range
est. 18-38 tok/s, typical error 10%

Speeds are ModelFit estimates from chip bandwidth and model size, not measured benchmarks. Typical error: the median gap between the ModelFit speed model and measured runs on hardware the model was not fitted on, for this backend and model size.

Cite this page: ModelFit, Best Local AI Models for iMac, https://modelfit.io/imac/, updated October 2026, CC BY 4.0.

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FAQ

Frequently asked questions

What is the best AI model for iMac?

The 24-inch iMac runs local AI on the same base chips as the Mac mini, with 8GB to 32GB of unified memory. The 2026 M6 iMac reaches up to 170 GB/s memory bandwidth, enough for 9B-14B class models at everyday speeds on 24GB and 32GB configs; 8GB M1 and M3 units stay with 4B-class models. On the default Apple M6 with 16GB RAM, Qwen3.5 9B Instruct is our top pick, handling models up to about 12B parameters at this RAM. Higher-RAM iMac configurations, including Pro and Max tiers where available, reach into the 9B-14B parameter range.

What size models fit on iMac?

With 16GB unified memory, iMac runs models up to about 12B parameters comfortably. Strong picks include Qwen3.5 9B Instruct, Mellum2.1 12B-A2.5B Thinking, NVIDIA Nemotron 3.5 Bolt E4B. Higher-RAM configurations, including Pro and Max tiers where available, reach into the 9B-14B parameter range. Use the ModelFit wizard to match your exact RAM and chip.

How fast is local AI on iMac?

On the Apple M6 with optimized, quantized models, expect est. 28 tok/s, typical error 10%. The iMac M6 (announced 2026-10-27) comes with a 10-core or 12-core GPU; 32GB needs the 12-core model. Memory bandwidth is 153 GB/s on 16GB and 170 GB/s on 24GB and 32GB. In ModelFit estimates the 24GB config runs a 7B Q4 reference at ~34 tok/s. Pre-orders open October 28, shipping November 6. (Speeds are ModelFit estimates, not measured benchmarks, and vary with model size and quantization.)