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Notes on models, agents, and what inference costs

Practical writing for developers building with large language models — how they work, how to pick one, and how to keep the bill predictable.

All 731Models 446AI Agents 74Cost & Pricing 62Fundamentals 72Guides 77

Picking between models — and testing them on your own work.

Stop Reading Benchmarks. Build a 20-Task Eval Instead.
Models
Models·9 min read

Stop Reading Benchmarks. Build a 20-Task Eval Instead.

Public leaderboards tell you almost nothing about your codebase. Here is how to build a private eval set in an afternoon and actually know which model to use.

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The Best Model for Refactoring Is the One That Stays in Scope
Models
Models·9 min read

The Best Model for Refactoring Is the One That Stays in Scope

Refactoring is a constraint problem, not a generation problem. What the task actually demands from a model, and how to measure it on your own repo.

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