Arin (@gpujaff) header
Arin (@gpujaff) profile picture
New York City
Joined September 2026
Photo by Arin (@gpujaff)
$CRWV and $NBIS both report earnings next week. They've both been cut roughly in HALF in the past month, but they’re fundamentally different businesses financially: • ~98% of CoreWeave’s revenue is take-or-pay on ~5-year contracts. Only about half of Nebius’s is long-term; the rest reprices within 1–3 years, plus their spot market. • On ~70% of Nebius’s Q2 deals, customers prepaid 50–60% of capex. CoreWeave’s prepayments run 15–25% of contract value. • On five-year GPU loans, CoreWeave’s latest priced at SOFR+5.50%. Nebius’s: SOFR+2.50%. CoreWeave carries more financing risk, but has over a GIGAWATT more running than Nebius (1.5 GW vs. ~0.25 GW). Nebius is behind on power, but its balance sheet is more...balanced. Take your pick. Battle of the neoclouds is happening next week!
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Wild. Weights are becoming something you program, meaning custom self-hosted models are about to get a LOT cheaper. Compute is king.
We asked GPT-6 Astra to edit Qwen3.5-0.8B weights to improve math. It directly changed only 0.016% of weights, fixing 0.8B's reasoning loops & improving math up to 6x and even instruction following 3x, without gradients or training. We call this Weight-Space Programming: frontier LLMs can now natively read/write neural network weights! 🧵 Blog: rikiyat.github.io/blog/weigh…
Readers added context they thought people might want to know
LLM was given weights explicitly as text in prompt and used code/forward passes (per authors' logs) to ablate Qwen looping direction, a known thinking-mode issue per model card. Primarily fixed repetition in that mode, not general 'natively' improving weights/math. rikiyat.github.io/blog/weight-sp… github.com/RikiyaT/lm_und… huggingface.co/Qwen/Qwen3.5-0… huggingface.co/RikiyaT/Qwen3.…
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Given the current state of AI financing, I wanted to make a simple live tracker for the state of the AI money machine. Check it out at compute.arinjaff.com. If I missed anything there's a submission form per-company, feel free to contribute, will be updating this live!
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The Vera Rubin buildout by @nebiusai will bring in a whole new era of neocloud profit margins
Nebius announced 1GW online in 2027 in VERA RUBINS alone -> @gpujaff gives us an earnings breakdown below ⤵️ ***Not to mention - this is assuming a 1yr contract , not the additional profit opportunities of renting out on-demand/M2M
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