Qwen3.5 122B-A10B on Mac Studio M1 Ultra 128 GB
125.086B (10B active) on 128 GB at 800 GB/s. Hardware details · Model details
Yes. Qwen3.5 122B-A10B fits on Mac Studio M1 Ultra 128 GB at the recommended
Q4_K_M configuration, requiring approximately 76.1 GB at 8K context. Practical context capacity is 256K.CompatibilityComfortable
Calculated fit
Yes
Calculated Uses under 80% of usable memory. Room for a long context and other work.
Recommended quantization
Q4_K_M
Calculated gguf
Memory required
76.1 GB
Calculated of 108.8 GB usable — 70%
Max practical context
256K
Calculated model supports 256K
Memory budget at 8K context
Model weights ⓘ
72.7 GB Calculated
KV cache ⓘ
0.2 GB Calculated
Runtime overhead ⓘ
3.2 GB Estimated
Total required
76.1 GB Calculated
Headroom ⓘ
32.7 GB Calculated
Highest-precision quantization that leaves headroom: uses 70% of usable memory at 8K context.
Unified memory: weights, KV cache and the OS share the same 128 GB pool. We assume 85% is addressable by the GPU, which matches a headless machine with the wired-memory limit raised.
Mixture of experts: all 125.086B parameters must be resident in memory even though only ~10B are active per token. Memory follows total parameters; speed follows active parameters.
Hybrid attention: token-growing KV memory is charged to 12 full-attention blocks. The linear-attention blocks also hold fixed-size state, so the memory estimate is approximate.
Performance
Estimated performance · recommended Q4_K_M
Decode, prefill and TTFT below are estimates for Q4_K_M. We do not have a comparable Q4_K_M measurement on this machine.
Estimated decode
—
Estimated Q4_K_M; calculated range
Estimated prefill
—
Estimated Q4_K_M; calculated range
Estimated TTFT at 8K
—
Estimated Q4_K_M; calculated range
Hardware load reference
—
Official spec hardware TDP; not this model run
No throughput figures for this configuration. We do not estimate performance for a model that cannot load.
How the estimate is calculated
- Decode: reading 10.0B active parameters at 4.85 bits/weight takes 10.83 ms at 800 GB/s x 70% achieved efficiency.
- MoE routing penalty of 15% applied: expert gathers are less bandwidth-efficient than a dense sweep.
- MoE decode depends on how well the engine batches expert gathers; real results vary more than for dense models.
- No FP16 compute figure for this hardware, so prefill cannot be estimated.
- This is a calculated estimate, not a measurement. It assumes a single request, a short prompt, no speculative decoding and a warm model already resident in memory.
Estimator version estimator_v1. Stored with every estimated row so old estimates can be regenerated when the model improves.
Submit a benchmarkSubmissions stay pending until reviewed.
This model at other quantizations on this machine
| Quantization | Resident | Disk | Total needed | Utilisation | Fit | Max context |
|---|---|---|---|---|---|---|
MLX 4-bit | 68.1 GB | 68.1 GB | 71.4 GB | 66% | Comfortable | 256K |
Q4_K_Mrecommended | 72.7 GB | 72.7 GB | 76.1 GB | 70% | Comfortable | 256K |
Q5_K_M | 85.3 GB | 85.3 GB | 89.1 GB | 82% | Fits | 256K |
Q8_0 | 126.3 GB | 126.3 GB | 131.2 GB | 121% | Does not fit | 0 |
BF16 | 233.0 GB | 233.0 GB | 241.2 GB | 222% | Does not fit | 0 |
Cost of running Qwen3.5 122B-A10B on this machineUnited States (federal) · C corporation · 8h/day
Monthly economic cost
$0
Calculated after tax
Codex/Claude Code
$100/mo
≈ $100/mo · local is $100 less
Net cash at purchase
$0
Calculated VAT not reclaimable
Total over 5 years
$0
Calculated after tax, after resale
Cost per USD/1M tokens
—
Calculated
The $100 comparison uses the Codex Pro 5x / Claude Max 5x plans. A fixed planning conversion is used for USD. This compares monthly spend only: subscriptions have usage limits, local hardware has different capabilities and constraints, and taxes or regional pricing may change the charged amount. Prices checked 7 September 2026.
Monthly breakdown
| Depreciation 0 over 5 years, straight-line to a 0 residual | $0.00 |
| Electricity 0.0 kWh/month at 0.140/kWh | $0.00 |
| Monthly cost before tax | $0.00 |
| Electricity tax shield Running costs are deductible business expenses | -$0.00 |
| Monthly economic cost after tax | $0.00 |
Three different numbers, deliberately
Cash cost
$0
Money that leaves the bank account on day one, net of reclaimable VAT.
Accounting depreciation
$0.00/month
$0 written down over 5 years to a $0 residual.
After-tax economic cost
$0.00/month
Depreciation plus running costs plus cost of capital, less the tax those deductions save. This is the figure to compare between machines.
Assumptions and sources (verified 2026-09-07)
VAT rate
0% Official spec
VAT recoverable
0% Official spec
Federal C-corporation estimate at the flat 21% rate. Pass-through entities should use the sole-proprietor estimate as a rougher proxy.
Effective deduction rate
21.00% Calculated
Headline marginal rate 21.00%.
Depreciation
5 years, straight-line Assumption
Residual value
$0 (30%) Assumption
Extrapolated from the three-year curve.
Electricity
$0.000/kWh Assumption
Average power draw
0 W Calculated
Load — for 20% of powered hours, idle 0 W for the rest — a machine that is on is not generating tokens the whole time.
Investment allowances
§179 100.0% Official spec
Worth $0 in total — first-year expensing that replaces later tax depreciation.
Cost of capital
not applied Assumption
- VAT rate: No US federal VAT · verified 2026-09-07
- Marginal tax rate: IRS Publication 542 — Corporations · verified 2026-09-07
- VAT recoverable fraction: site assumption · verified 2026-09-07
- Useful life: IRS Publication 946 — How To Depreciate Property · verified 2026-09-07
- Electricity price: Site assumption · verified 2026-09-07
Federal planning estimate only, not tax advice. State and local income tax, sales/use tax and incentives are excluded. It assumes 100% business use, a Section 179 election, enough business income to use it, and that the full annual limit remains available.
Qwen3.5 122B-A10B on other hardware
| Hardware | Decode | Price | Fit |
|---|---|---|---|
| NVIDIA DGX H200 (8x H200, 1,128 GB) | ~441–635 t/s | $359,430 * | Comfortable |
| Quad RTX 5090 workstation (4x 32 GB) | ~223–320 t/s | $12,611 * | Comfortable |
| Lenovo ThinkStation PX (4x RTX PRO 6000, 384 GB) | ~135–195 t/s | $58,553 * | Comfortable |
| RTX PRO 6000 Blackwell workstation (96 GB) | ~133–192 t/s | $10,359 * | Fits |
| RTX PRO 6000 Max-Q workstation (96 GB, 300 W) | ~133–192 t/s | $10,809 * | Fits |
| Mac Studio M5 Ultra 96 GB | ~112–162 t/s | $5,945 * | Fits |
Nearest alternatives to the Mac Studio M1 Ultra 128 GB
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