#コンテキストウィンドウ articles

1M context window Claude Code｜対応プラン・使い方・注意点

Claude Codeの1M context windowをわかりやすく解説。対応モデルとプラン、料金・usage creditsの条件、/modelでの設定手順、200Kとの使い分け、1Mが表示されないときの確認方法まで公式情報で整理します。自動圧縮や長いセッションで失敗しないための注意点も紹介します。

What Are Claude Tokens? Limits, Japanese Character Conversion, and Ways to Reduce Usage

How to Use Claude's 1 Million Token Context | Pricing, Practical Limits, and Use Cases

Anthropic News | White House Opposes Mythos Expansion Plans

Sonnet 4.5's 1M Token Beta Ends | Complete Migration Guide to Sonnet 4.6

What was deprecated is the Sonnet 4.5 beta header (context-1m-2025-08-07), not Sonnet 4.6 itself — Sonnet 4.6 ships with 1M token support as a standard feature. Migration requires just two changes: updating the model ID and removing the header, completable in a few lines.