Under The Hood
MSPKExploring what really happens when you write frontend code
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 34 | Subscribers | Read | mspk.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
You Hated Matrix Math in College. Turns Out It Runs Every AI Model You’ve Ever Used.
There’s a specific kind of pain reserved for sitting in a linear algebra lecture, staring at a matrix multiplication problem, and thinking: when will I ever use this?
The KV Cache: Why Your API Bill Is Higher Than It Should Be
If you’ve used the Claude or OpenAI APIs at any meaningful scale and never touched prompt caching, you’ve been overpaying. Potentially by 90%. Not as a rounding error — as a structural tax on not understanding what’s happening under the hoo...
Fine-Tuning vs. RAG vs. Prompting: Stop Asking Which Is Best
Every vendor selling fine-tuning will tell you fine-tuning is the answer. Every vendor selling a vector database will tell you RAG is the answer. Every API provider will tell you prompting is the answer. None of them are wrong — they’re jus...
Tokens Are Not Words: What Every Developer Building on LLMs Actually Needs to Know
You’ve been paying for tokens since the day you made your first API call. You know the rough “4 characters per token” heuristic. You’ve probably hit a context limit at least once and scrambled to truncate your prompt.
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