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

Simon Willison's Blog / 3/14/2026

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Key Points

  • 1M context is now generally available for Opus 4.6 and Sonnet 4.6, expanding long-context support for those models.
  • Standard pricing now applies across the full 1M window for both models, with no long-context premium.
  • The post contrasts this with OpenAI and Gemini pricing, noting that Gemini 3.1 Pro and GPT-5.4 charge more once token counts exceed certain thresholds (200k and 272k, respectively).
  • It links to Claude's blog for the announcement, highlighting a notable market shift in long-context pricing.

13th March 2026 - Link Blog

1M context is now generally available for Opus 4.6 and Sonnet 4.6. Here's what surprised me:

Standard pricing now applies across the full 1M window for both models, with no long-context premium.

OpenAI and Gemini both charge more for prompts where the token count goes above a certain point - 200,000 for Gemini 3.1 Pro and 272,000 for GPT-5.4.

Posted 13th March 2026 at 6:29 pm

This is a link post by Simon Willison, posted on 13th March 2026.

ai 1905 generative-ai 1689 llms 1655 anthropic 264 claude 260 llm-pricing 66 long-context 20

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