# Long-Context Engineering — 1M+ Tokens · AtomEons Atlas

**Route:** `atomeons.com/learn/atlas/long-context-engineering`
**Category:** Atlas
**License:** CC-BY 4.0 unless otherwise noted on the page.

## Description

Gemini 2M, Claude 200K, the techniques that actually use them. Position interpolation, RoPE scaling, ring attention, needle-in-haystack vs real long-context tasks. What the published numbers say and where they break.

## Headings

- Long-context engineering — making 1M+ tokens useful
- What it is
- How it actually works
- Receipts
- What practitioners do with it
- What it is NOT

## Body

§ Atlas · Architecture · scaling axis

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*All lab content is CC-BY 4.0. Cite as: AtomEons Systems Laboratory, Long-Context Engineering — 1M+ Tokens · AtomEons Atlas, atomeons.com/learn/atlas/long-context-engineering.*