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GPT-5.4 nano vs Grok 4.3

OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.

  • Grok 4.3 has the higher intelligence index (90.1 vs 81.7)
  • GPT-5.4 nano is cheaper ($0.20 vs $1.25 per 1M input)
  • GPT-5.4 nano is faster
  • Grok 4.3 has a larger context window (1M)
GPT-5.4 nanoGrok 4.3
Intelligence index81.790.1
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens1,000,000 tokens
Input price$0.20 / 1M$1.25 / 1M
Output price$1.25 / 1M$2.50 / 1M
Speed157 tok/s88 tok/s
ReleasedMarch 17, 2026May 6, 2026
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.4 nano
Grok 4.3
GPQA Diamond
81.7
90.1
Humanity’s Last Exam
26.5
35