Anthropic、100万トークンコンテキストウィンドウの追加料金を廃止しOpus 4.6とSonnet 4.6を大幅に低価格化

Anthropic is making Claude's extra-large context window a lot cheaper. The Opus 4.6 and Sonnet 4.6 models now offer a context window of one million tokens at the standard price. Until now, Anthropic charged a surcharge of up to 100 percent for requests exceeding 200,000 tokens. The context window determines how much text an AI model can process in a single request.

Opus 4.6 still costs $5/$25 per million tokens (input/output), and Sonnet 4.6 runs $3/$15. But whether a prompt contains 9,000 or 900,000 tokens no longer matters for pricing. On top of that, the media limit jumps from 100 to 600 images or PDF pages per request. The new pricing applies to Claude Code (Max, Team, and Enterprise) and is available through Amazon Bedrock (except for the media limit), Google Cloud Vertex AI, and Microsoft Foundry.

The GraphWalks BFS benchmark measures how well AI models handle logical reasoning across large amounts of text. Opus 4.6 reportedly shows almost no drop in performance even at full context length. | Image: Anthropic

According to Anthropic, both models achieve the highest accuracy among comparable models at full context length in benchmark tests. That said, the broader problem of declining precision as context windows fill up is still far from solved.

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