Dataset updated 2026-11-12Devstral 2 123B
Devstral 2 123B loads in 74.9 GB at Q4_K_M, comfortably from 128 GB of memory, Macs included, starting at the MacBook Pro M5 Max 128GB. Below is the memory math we ran for it, the smallest card that fits, and the fastest machine we track.
- Parameters
- 123B
- Format
- Q4_K_M
- Min memory
- 96 GB
- Best for
- Agentic coding, Software engineering
How much memory does Devstral 2 123B need?
Devstral 2 123B is a 123B dense model built for agentic coding, software engineering. The weights alone take 74.9 GB at Q4_K_M; add context and the OS, and it belongs in the 128 GB memory class. Every number below comes from the ModelFit engine: speeds are estimates, labeled est., because we do not benchmark hardware ourselves.
KV = fp16 estimate (q8_0 cache roughly halves it). "Comfortable" = weights + KV within the engine's tiered budget (~70-85% of memory).
Which machines run Devstral 2 123B?
- Smallest GPU
- NVIDIA RTX PRO 6000 Blackwellest. 21 tok/s · 96 GB VRAMtypical error 10%
- Fastest
- NVIDIA RTX PRO 6000 Blackwellest. 21 tok/stypical error 10%
- Runs on a Mac?
- MacBook Pro M5 Max 128GBest. 7 tok/stypical error 10%
Verdicts come from the same engine that powers our fit checker: memory capacity first, bandwidth for speed. How we compute these numbers · What typical error means · Hugging Face model card
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Frequently asked questions
How much memory does Devstral 2 123B need?
74.9 GB for the Q4_K_M weights, plus ~6.0 GB of KV-cache at 16k context, about 80.9 GB total. Comfortable from 128 GB of VRAM or unified memory.
Does Devstral 2 123B run on a Mac?
Yes, from the MacBook Pro M5 Max 128GB (est. 7 tok/s, typical error 10%). Unified memory means the RAM budget is the only limit.
What is the smallest GPU for Devstral 2 123B?
The NVIDIA RTX PRO 6000 Blackwell (96 GB VRAM) is the smallest tracked card that runs Devstral 2 123B comfortably, est. 21 tok/s, typical error 10%.
Cite this page
ModelFit: Devstral 2 123B, specs, memory math and hardware verdicts. https://modelfit.io/models/devstral-2-123b/ (dataset updated 2026-11-12, CC BY 4.0).