context window

/compact

/compact summarizes a long Claude Code session so you can keep going without starting over, and you can tell it which details to keep.

Context engineering

Context engineering is deciding what a model sees on each call: system prompt, documents, history, tools. How it differs from prompt engineering.

Gemini

Gemini is Google's family of AI models, known for very large context windows and strong handling of long documents, images, and audio.

Tokens

A token is the chunk of text a model reads and writes in, roughly four characters. Why pricing and context limits are both counted in them.