#コンテキストウィンドウ articles

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.