RTX 5090 local LLM math: a day of inference outputs less than $1 worth of API usage
PurzBeats · x · 2026-11-10
A Japanese user benchmarked local LLMs on an RTX 5090: it runs so slowly that a full day of continuous inference produces roughly what $1 of API usage would. Counting electricity alone, you lose money before you even factor in the GPU cost.
The takeaway: unless you need offline or privacy guarantees, paying for APIs is simply cheaper. PurzBeats shared it as a reminder whenever someone says they're buying a 5090 for local LLMs.
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