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 models. It highlights the surprising pricing model where standard rates apply for the full context, unlike OpenAI's GPT-5.4 and Google's Gemini 3.1 Pro which charge premiums for longer prompts. This is a technical analysis of LLM pricing and capabilities.

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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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