What is tool use?
Letting the model call your code — the feature that turns a chatbot into software.
AI for Work
Productivity and business tooling, evaluated for what it changes day to day.
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What is an AI agent?
A model that can take actions in a loop — and the word the industry has worn out.
What is prompt caching?
Paying once for the part of your prompt that never changes — and the write fee nobody mentions.
What is RAG (retrieval-augmented generation)?
Giving the model the documents instead of hoping it memorised them.
How to cut your LLM API bill
Four levers, ranked by how much they actually save. Switching vendor is not one of them.
LLM API pricing compared: OpenAI vs Anthropic vs Google
Output costs five to six times more than input — at every vendor, at every tier. That ratio, not the headline price, is what decides your bill.
What can you actually get for free?
Google gives away every Flash text model and an older Pro. It does not give away the current Pro, or a single image.
What does AI voice actually cost?
Audio tokens cost eight times what text tokens cost. But the cache discount on them is close to 99%.