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Grok 4 Fast versus ChatGPT comparison showing 2 million token context window and $0.20 per million token API pricing

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April 26, 2026

Artem Vysotsky

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Most 'what is Grok' articles miss the two specs that actually change the comparison: Grok 4 Fast has a 2M token context window and costs $0.20 per million input tokens. Here's what that means for your work.

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