Simon Willison • 3/13/2026

1M context is now generally available for Opus 4.6 and Sonnet 4.6

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The article discusses the general availability of a 1 million token context window for Anthropic's Claude Opus 4.6 and Sonnet 4.6 AI models. It highlights the surprising pricing model where standard rates apply for the full context, unlike competitors OpenAI and Gemini which charge premiums for prompts exceeding certain token thresholds (e.g., 200k for Gemini, 272k for GPT-5.4).

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#generative ai #Anthropic #Claude
1M context is now generally available for Opus 4.6 and Sonnet 4.6

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