Claude Opus 5 has one native 1M-token context window, but capacity, product access, usage limits, cost, and useful context are five different things.
Prompt Caching
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Claude Opus 5's 1M Context Window: What “Default” Really Means
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Claude Opus 5 has one native 1M-token context window, but capacity, product access, usage limits, cost, and useful context are five different things.