Will AI Labs' Mac-Buying Spree Hit M5 Ultra Mac Studio Stock?

An X post claiming OpenAI and Anthropic are buying Apple silicon at scale has r/LocalLLaMA asking what it means for the M5 Ultra Mac Studio — Apple's new flagship for local inference — as the machine enters a market already squeezed by a global RAM shortage. The thread, posted August 31 by u/No_Conversation9561, drew roughly 275 upvotes and 70-plus comments debating whether the desktops local-LLM users want are about to get scarcer and pricier.

What the Thread Says

The post is a screenshot of an X account called @LuminaBench. Its claim: OpenAI is buying tens of thousands of Mac minis and Mac Studios for reinforcement learning and computer-use training, while Anthropic mass-rents Mac minis through AWS for similar work. "Every decent piece of compute is being used by AI labs," it argues, adding that it "looks like a right time to buy." None of this is verified — the claim is an unverified X post, and neither OpenAI nor Anthropic has commented. What commenters find plausible is the mechanism: labs with an appetite for memory bandwidth, and Apple silicon sitting squarely in their path.

Apple's Own Signals

The documented facts point the same direction. Apple announced the M5 Max and M5 Ultra Mac Studio on August 25, with pre-orders open and shipping from September 22. The M5 Ultra starts at $5,499. But the line's first-ever price hike — a $500 bump to $2,499 in June — came as the global DRAM shortage tightened, and Macworld expects constrained supply: "Availability is likely to be limited due to the global RAM shortages so we expect that stock will quickly run out." The key numbers:

• M5 Ultra Mac Studio: from $5,499 ($5,099 education), pre-orders open
• Availability: from September 22; the 512GB configuration later
• June 2026: Mac Studio starting price raised $500, a first for the line
• Memory: up to 512GB unified at ~1.2TB/s bandwidth

Why It Matters for Local AI Buyers

The irony is hard to miss. The same labs selling cloud-first compute are, if the tweet is accurate, absorbing the desktop machines local-LLM users buy for the same workloads — 512GB of unified memory exists precisely for models that fit nowhere else. And the RAM shortage behind the worry is not speculative: server DRAM prices have spiked as data centers consume an outsized share of supply. We covered both sides — the M5 Ultra launch (/news/2026-08-27-apple-m5-ultra-1-2tb-memory-bandwidth) and the used-server-RAM crunch (/news/2026-08-29-used-server-ram-price-surge).

What would settle this: Apple's shipping dates slipping, retail stockouts, or an announced price for the 512GB configuration. None of that is here yet. But the pattern the tweet describes — labs hoovering up every machine with real memory bandwidth — is the one the market is already living.