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Tool Use and Function Calling, Explained

Krisztian Eyssen, Krisztian Eyssen

Tool Use and Function Calling, Explained

The most common misconception about this topic can be refuted in one sentence taken from the vendor documentation: **the model does not call the tool.** It fills in a form and says which one it would like — the call is made by your code. Everything else follows from that: the cost, the error handling, and the reason a single round gets three times more expensive.

Advanced Developer Explainer Agents & Automation

Sep 13, 2026

How AI Changed Programming

Krisztian Eyssen, Krisztian Eyssen

How AI Changed Programming

One of the most quoted measurements says you got 55.8% faster. Another says 19% slower. Neither is lying — they measured different jobs. And between the two sits the number that matters most: developers were **39 percentage points** wrong about their own speed.

Beginner Developer Explainer Coding & Development

Sep 12, 2026

Running Image Models on Your Own Machine

Krisztian Eyssen, Krisztian Eyssen

Running Image Models on Your Own Machine

Unlimited generation, no subscription, full control — and a very specific hardware bill. Here is where the line runs, how much VRAM each tier needs, and how many images it would take before this pays for itself.

Advanced Developer How-To Images & Design

Sep 12, 2026

Model Routers: One Key, Many Models

Krisztian Eyssen, Krisztian Eyssen

Model Routers: One Key, Many Models

One integration, five hundred models. This is the only sane way to try ten of them — and it has three hidden prices worth knowing in advance. On top of that, four different things get called a model router, and which one you mean matters.

Advanced Developer Tool review OpenRouter Models & Market

Sep 11, 2026

Embeddings and Vector Search, Explained Clearly

Krisztian Eyssen, Krisztian Eyssen

Embeddings and Vector Search, Explained Clearly

How a sentence turns into a row of numbers, and why that lets a machine find what you asked for in completely different words. There is no magic in the mechanism — but there are four traps that sink most in-house builds.

AI Basics Advanced Developer Explainer

Sep 10, 2026

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