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AI/TLDR

Working with LLM APIs

Calling Claude, GPT, and Gemini from code — streaming, structured outputs, function calling, caching, and the bill.

API Basics

Keys, messages, roles, and errors: everything before your first production call.

BEGINNERWhat Is an LLM API? Calling AI Models Over HTTP, ExplainedBEGINNERHow to Make Your First LLM API Call

Provider Guides

Hands-on first steps with every major door into the models.

BEGINNERWhat Is the Claude API? A Beginner's Guide to Building with AnthropicBEGINNEROpenAI API: A Beginner's Guide

Streaming & Structured Outputs

Tokens as they arrive, and JSON you can actually parse.

BEGINNERWhat Is Streaming in LLM APIs? Server-Sent Events ExplainedINTERMEDIATEWhat Are Structured Outputs in LLMs?

Function Calling

The API mechanism that lets a model ask your code to do things.

BEGINNERWhat Is Function Calling? How LLMs Trigger Your Code, Step by StepINTERMEDIATETool Calling Best Practices for LLMs

Cost, Caching & Rate Limits

Token economics: what you pay, what you cache, what throttles you.

BEGINNERHow LLM API Pricing Works: Input, Output, and Cached TokensINTERMEDIATEWhat Is Prompt Caching?