Grok 4 Fast versus GPT-5 (High)

Grok 4 Fast costs
– Input tokens: 84% cheaper
– Output tokens: 95% cheaper
– Output speed: 150% faster

GPT-5: $1.25/M input, $10/M output
Grok 4 Fast: $0.20/M input, $0.50/M output

Grok: 344 tokens/s GPT-5: ~138 tokens/s

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