M5 Ultra Mac Studio Review: The Dream Mac for Local AI Agents
A MacStories review finds the M5 Ultra Mac Studio with 256GB RAM excellent for running local AI agents and models via MLX at near-cloud responsiveness.
The review tests the top-spec M5 Ultra Mac Studio with 256GB unified memory against an M3 Ultra and an RTX 5090 desktop, finding it a strong platform for local AI agents in OpenClaw, Hermes Agent, and Codex. The author runs Qwen3.8-Flash-Next as a default local model and describes a 99-day workflow where DeepSeek V4 Flash agents plus olmOCR processed 310 documents locally at zero API cost. An RTX 5090 retains an edge in memory bandwidth, but the Mac Studio wins on size, thermals, and macOS integration.
- M5 Ultra with 256GB unified memory enables fast local agents with no cloud cost
- Qwen3.8-Flash-Next used as default model in Hermes Agent and Open Minis
- DeepSeek V4 Flash agents ran 24/7 for 99 days processing 310 documents locally
- RTX 5090 still leads on memory bandwidth
- Organizations
- Apple
- AI models
- Qwen3.8-Flash-NextDeepSeek V4 Flash
From the original article
14 min read at macstories.net
For the past few days, I’ve been testing the ( currently ) top-of-the-line M5 Ultra Mac Studio with 256 GB of RAM . I’ll cut to the chase: the M5 Ultra Mac Studio is a dream machine for local AI agents. This computer makes it possible to run personal assistants powered by local models with great performance and no additional cloud costs.
By piotrgrabowski · macstories.net
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