cost
3 free lessons tagged cost across AI. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
LLM Pricing and Latency: What Actually Drives Cost
How frontier LLM costs and latency actually work in 2026 — input vs output token asymmetry, prompt caching, batch API discounts, TTFT and tokens-per-second, reasoning-model amplification, and when self-hosting breaks even.
Choosing the Right LLM for Your Use Case
A practical decision framework for picking an LLM in 2026 — define the task, build an offline eval, measure quality + latency + cost on real candidates, and avoid the classic trap of optimizing for benchmarks instead of your task.
Caching for LLM systems: three layers, in order of leverage
How to cut LLM bills 50-90% without sacrificing freshness. Covers the three caching layers (response, prefix, semantic), what each costs to build, and the cases where caching subtly breaks correctness.