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Original: Simon Willison · 13/03/2026

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Summary

1M context is now available for Opus 4.6 and Sonnet 4.6, with standard pricing across the full window and no long-context premium.

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Key Insights

“Standard pricing now applies across the full 1M window for both models, with no long-context premium.” — Discussing the new pricing model for Opus 4.6 and Sonnet 4.6.
“OpenAI and Gemini both charge more for prompts where the token count goes above a certain point.” — Comparing pricing strategies with other models.

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Topics

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Full Article

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

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Originally published at https://simonwillison.net/2026/Mar/13/1m-context/#atom-everything.